Found 29 papers in cond-mat
Date of feed: Wed, 20 Sep 2023 00:30:00 GMT

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Origin of magic angles in twisted bilayer graphene: The magic ring. (arXiv:2309.10026v1 [cond-mat.mes-hall])
Wei-Chen Wang, Feng-Wu Chen, Kuan-Sen Lin, Justin T. Hou, Ho-Chun Lin, Mei-Yin Chou

The unexpected discovery of superconductivity and strong electron correlation in twisted bilayer graphene (TBG), a system containing only sp electrons, is considered as one of the most intriguing developments in two-dimensional materials in recent years. The key feature is the emergent flat energy bands near the Fermi level, a favorable condition for novel many-body phases, at the so-called "magic angles". The physical origin of these interesting flat bands has been elusive to date, hindering the construction of an effective theory for the unconventional electron correlation. In this work, we have identified the importance of charge accumulation in the AA region of the moire supercell and the most critical role of the Fermi ring in AA-stacked bilayer graphene. We show that the magic angles can be predicted by the moire periodicity determined by the size of this Fermi ring. The resonant criterion in momentum space makes it possible to coherently combine states on the Fermi ring through scattering by the moire potential, leading to flat bands near the Fermi level. We thus establish the physical origin of the magic angles in TBG and identify the characteristics of one-particle states associated with the flat bands for further many-body investigations.

Perturbative RG flows in AdS: an \'etude. (arXiv:2309.10031v1 [hep-th])
Edoardo Lauria, Michael Milam, Balt C. van Rees

We discuss general properties of perturbative RG flows in AdS with a focus on the treatment of boundary conditions and infrared divergences. In contrast with flat-space boundary QFT, general covariance in AdS implies the absence of independent boundary flows. We illustrate how boundary correlation functions remain conformally covariant even if the bulk QFT has a scale. We apply our general discussion to the RG flow between consecutive unitary diagonal minimal models which is triggered by the $\phi_{(1,3)}$ operator. For these theories we conjecture a flow diagram whose form is significantly simpler than that in flat-space boundary QFT. In several stand-alone appendices we discuss two-dimensional BCFTs in general and the minimal model BCFTs in particular. These include both an extensive review as well as the computation of several new BCFT correlation functions.

Topological quantum chains protected by dipolar and other modulated symmetries. (arXiv:2309.10036v1 [cond-mat.str-el])
Jung Hoon Han, Ethan Lake, Ho Tat Lam, Ruben Verresen, Yizhi You

We investigate the physics of one-dimensional symmetry protected topological (SPT) phases protected by symmetries whose symmetry generators exhibit spatial modulation. We focus in particular on phases protected by symmetries with linear (i.e., dipolar), quadratic and exponential modulations. We present a simple recipe for constructing modulated SPT models by generalizing the concept of decorated domain walls to spatially modulated symmetry defects, and develop several tools for characterizing and classifying modulated SPT phases. A salient feature of modulated symmetries is that they are generically only present for open chains, and are broken upon the imposition of periodic boundary conditions. Nevertheless, we show that SPT order is present even with periodic boundary conditions, a phenomenon we understand within the context of an object we dub a ``bundle symmetry''. In addition, we show that modulated SPT phases can avoid a certain no-go theorem, leading to an unusual algebraic structure in their matrix product state descriptions.

A stabilizer code model with non-invertible symmetries: Strange fractons, confinement, and non-commutative and non-Abelian fusion rules. (arXiv:2309.10037v1 [hep-th])
Tanay Kibe, Ayan Mukhopadhyay, Pramod Padmanabhan

We introduce a stabilizer code model with a qutrit at every edge of a two-dimensional lattice and with non-invertible plaquette operators. The degeneracy of the ground state is topological (determined by the genus) as in the toric code, and it also has the usual deconfined excitations consisting of pairs of electric and magnetic charges. However, there are novel types of confined fractonic excitations composed of a cluster of adjacent faces (defects) with vanishing flux. They manifest confinement, and even larger configurations of these fractons are fully immobile although they acquire emergent internal degrees of freedom. Deconfined excitations change their nature in presence of these fractonic defects. As for instance, a magnetic monopole can exist anywhere on the lattice exterior to a fractonic defect cluster while electric charges acquire restricted mobility. These imply that our model featuring fractons is neither of type I, nor of type II. Furthermore, local operators can annihilate the ground state. All these properties can be captured via a novel type of non-commutative and non-Abelian fusion category in which the product is associative but does not commute, and can be expressed as a sum of (operator) equivalence classes which includes that of the zero operator. We introduce many other variants of this model and discuss their relevance in quantum field theory.

Topological modes and spectral flows in inhomogeneous PT-symmetric continuous media. (arXiv:2309.10110v1 [physics.plasm-ph])
Yichen Fu, Hong Qin

In Hermitian continuous media, the spectral-flow index of topological edge modes is linked to the bulk topology via index theorem. However, most inhomogeneous continuous media in classical fluids and plasmas are non-Hermitian. We show that the connection between topological edge modes and bulk topology still exists in these non-Hermitian continuous media if the systems are PT-symmetric and asymptotically Hermitian. The theoretical framework developed is applied to the Hall magnetohydrodynamic model to identify a topological edge mode called topological Alfv\'{e}n-sound wave in magnetized plasmas.

Unconventional transport properties in systems with triply degenerate quadratic band crossings. (arXiv:2309.10198v1 [cond-mat.mes-hall])
Zhihai Liu, Luyang Wang, Dao-Xin Yao

A quadratic band crossing (QBC) is a crossing of two bands with quadratic dispersion, which has been intensively investigated due to its appearance in Bernal-stacked bilayer graphene. Here, we study an extension of QBCs, the triply degenerate quadratic band crossing (TQBC), which is a three-band crossing node containing two quadratic dispersing bands and a flat band. We focus on two types of TQBCs. The first type contains a symmetry-protected QBC and a free-electron band, the prototype of which is the AA-stacked bilayer squareoctagon lattice. In a magnetic field, such a TQBC exhibits an anomalous Landau level structure, leading to a distinctive quantum Hall effect which displays an infinite ladder of Hall plateaus when the chemical potential approaches zero. The other type of TQBC can be viewed as a pseudospin-1 extension of the bilayer-graphene QBC. Under perturbations, this type of TQBCs may split into linear pseudospin-1 Dirac-Weyl fermions. When tunneling through a potential barrier, the transmission probability of the first type decays exponentially with the barrier width for any incident angle, similar to the free-electron case, while the second type hosts an all-angle perfect reflection when the energy of the incident particles is equal to half the barrier height.

Field Orientation Dependent Magnetic Phases In Weyl Semimetal Co3Sn2S2. (arXiv:2309.10221v1 [cond-mat.mtrl-sci])
Samuel E. Pate, Bin Wang, Bing Shen, J. Samuel Jiang, Ulrich Welp, Wai-Kwong Kwok, Jing Xu, Kezhen Li, Ralu Divan, Zhi-Li Xiao

Magnetism plays a key role in the emergence of topological phenomena in the Weyl semimetal Co3Sn2S2, which exhibits a ferromagnetic (FM) interactions along the c-axis of the crystal and an antiferromagnetic (AFM) interactions within the ab plane. Extensive studies on the temperature dependence of the magnetism with the magnetic field along the c-axis have uncovered a number of magnetic phases. Currently, the nature and origins of the reported magnetic phases are under debate. Here we report on magnetic field orientation effects on the magnetism in Co3Sn2S2. The shape of the hysteresis loop of the Hall resistance at a fixed temperature is found to change from rectangular to bow-tie-like as the magnetic field is tilted from the c-axis towards the ab plane, resembling that reported for magnetic fields along the c-axis as the temperature approaches the Curie temperature from below. Unlike their temperature-dependent counterparts, the newly observed bow-tie-like hysteresis loops show exchange bias. Our results showcase the contribution of the in-plane AFM interactions to the magnetism in Co3Sn2S2 and demonstrate a new way to tune its magnetic phases. They also shed light on the temperature-dependent magnetic phases occurring in the magnetic field along the c-axis of the crystal.

Disorder and diffuse scattering in single-chirality (TaSe$_4$)$_2$I crystals. (arXiv:2309.10236v1 [cond-mat.str-el])
Jacob A. Christensen, Simon Bettler, Kejian Qu, Jeffrey Huang, Soyeun Kim, Yinchuan Lu, Chengxi Zhao, Jin Chen, Matthew J. Krogstad, Toby J. Woods, Fahad Mahmood, Pinshane Y. Huang, Peter Abbamonte, Daniel P. Shoemaker

The quasi-one-dimensional chiral compound (TaSe$_4$)$_2$I has been extensively studied as a prime example of a topological Weyl semimetal. Upon crossing its phase transition temperature $T_\textrm{CDW}$ $\approx$ 263 K, (TaSe$_4$)$_2$I exhibits incommensurate charge density wave (CDW) modulations described by the well-defined propagation vector $\sim$(0.05, 0.05, 0.11), oblique to the TaSe$_4$ chains. Although optical and transport properties greatly depend on chirality, there is no systematic report about chiral domain size for (TaSe$_4$)$_2$I. In this study, our single-crystal scattering refinements reveal a bulk iodine deficiency, and Flack parameter measurements on multiple crystals demonstrate that separate (TaSe$_4$)$_2$I crystals have uniform handedness, supported by direct imaging and helicity dependent THz emission spectroscopy. Our single-crystal X-ray scattering and calculated diffraction patterns identify multiple diffuse features and create a real-space picture of the temperature-dependent (TaSe$_4$)$_2$I crystal structure. The short-range diffuse features are present at room temperature and decrease in intensity as the CDW modulation develops. These transverse displacements, along with electron pinning from the iodine deficiency, help explain why (TaSe$_4$)$_2$I behaves as an electronic semiconductor at temperatures above and below $T_\textrm{CDW}$, despite a metallic band structure calculated from density functional theory of the ideal structure.

Chiral Skyrmions Interacting with Chiral Flowers. (arXiv:2309.10338v1 [cond-mat.mes-hall])
Xichao Zhang, Jing Xia, Oleg A. Tretiakov, Motohiko Ezawa, Guoping Zhao, Yan Zhou, Xiaoxi Liu, Masahito Mochizuki

The chiral nature of active matter plays an important role in the dynamics of active matter interacting with chiral structures. Magnetic skyrmions are chiral objects, and their interaction with chiral nanostructures can lead to intriguing phenomena. Here, we explore the dynamics of a thermally activated chiral skyrmion interacting with a chiral flower-like obstacle in a ferromagnetic layer with chiral exchange interactions. The chiralities from different aspects in the studied system give rise to nontrivial random-walk dynamics that may have implications for spintronic applications. We demonstrate that the thermal random walk of chiral skyrmions interacting with chiral flowers could lead to deterministic outcomes that are topology-dependent. It is a spontaneous mesoscopic order-from-disorder phenomenon driven by the thermal fluctuations and topological nature of skyrmions, which exists only in ferromagnetic and ferrimagnetic substrates with chiral flower-like obstacles. The interactions between the skyrmions and chiral flowers at finite temperatures can be utilized to control the skyrmion position and distribution without the application of any external driving force or temperature gradient. The fact that a thermally activated skyrmion could be dynamically coupled to a chiral flower may open a new way for the design of topological sorting devices based on chiral flower-like nanostructures.

Krylov Complexity of Fermionic and Bosonic Gaussian States. (arXiv:2309.10382v1 [quant-ph])
Kiran Adhikari, Adwait Rijal, Ashok Kumar Aryal, Mausam Ghimire, Rajeev Singh, Christian Deppe

The concept of \emph{complexity} has become pivotal in multiple disciplines, including quantum information, where it serves as an alternative metric for gauging the chaotic evolution of a quantum state. This paper focuses on \emph{Krylov complexity}, a specialized form of quantum complexity that offers an unambiguous and intrinsically meaningful assessment of the spread of a quantum state over all possible orthogonal bases. Our study is situated in the context of Gaussian quantum states, which are fundamental to both Bosonic and Fermionic systems and can be fully described by a covariance matrix. We show that while the covariance matrix is essential, it is insufficient alone for calculating Krylov complexity due to its lack of relative phase information. Our findings suggest that the relative covariance matrix can provide an upper bound for Krylov complexity for Gaussian quantum states. We also explore the implications of Krylov complexity for theories proposing complexity as a candidate for holographic duality by computing Krylov complexity for the thermofield double States (TFD) and Dirac field.

Vortex-core spectroscopy of $d$-wave cuprate high-temperature superconductors. (arXiv:2309.10446v1 [cond-mat.supr-con])
Ivan Maggio-Aprile, Tejas Parasram Singar, Christophe Berthod, Tim Gazdić, Jens Bruér, Christoph Renner

The mechanism of high-temperature superconductivity remains one of the great challenges of contemporary physics. Here, we review efforts to image the vortex lattice in copper oxide-based high-temperature superconductors and to measure the characteristic electronic structure of the vortex core of a $d$-wave superconductor using scanning tunneling spectroscopy.

Anomalous Shubnikov-de Haas effect and observation of the Bloch-Gr\"uneisen temperature in the Dirac semimetal ZrTe5. (arXiv:2309.10480v1 [cond-mat.mtrl-sci])
S. Galeski, K. Araki, O. K. Forslund, R. Wawrzynczak, H. F. Legg, P. K. Sivakumar, U. Miniotaite, F. Elson, M. Månsson, C. Witteveen, F. O. von Rohr, A.Q.R. Baron, D. Ishikawa, Q. Li, G. Gu, L. X. Zhao, W. L. Zhu, G. F. Chen, Y. Wang, S.S.P. Parkin, D. Gorbunov, S. Zherlitsyn, B. Vlaar, D. H. Nguyen, S. Paschen, P. Narang, C. Felser, J. Wosnitza, T. Meng, Y. Sassa, S. A. Hartnoll, J. Gooth

Appearance of quantum oscillations (QO) in both thermodynamic and transport properties of metals at low temperatures is the most striking experimental consequence of the existence of a Fermi surface (FS). The frequency of these oscillations and the temperature dependence of their amplitude provides essential information about the FS topology and fermionic quasiparticle properties. Here, we report the observation of an anomalous suppression of the QO amplitude seen in resistivity (Shubnikov de-Haas effect) at sub-kelvin temperatures in ZrTe5 samples with a single small FS sheet comprising less than 5% of the first Brillouin zone. By comparing these results with measurements of the magneto-acoustic QO and the recovery of the usual Lifshitz-Kosevich behavior of the Shubnikov de-Haas (SdH) effect in ZrTe$_5$ samples with a multi-sheet FS, we show that the suppression of the SdH effect originates from a decoupling of the electron liquid from the lattice. On crossing the so-called Bloch-Gr\"uneisen temperature, T$_BG$, electron-phonon scattering becomes strongly suppressed and in the absence of Umklapp scattering the electronic liquid regains Galilean invariance. In addition, we show, using a combination of zero-field electrical conductivity and ultrasonic-absorption measurements, that entering this regime leads to an abrupt increase of electronic viscosity.

Note on general functional flows in equilibrium systems. (arXiv:2309.10496v1 [cond-mat.stat-mech])
Kiyoharu Kawana

We study the response of generating functionals to a variation of parameters (couplings) in equilibrium systems i.e. in quantum field theory (QFT) and equilibrium statistical mechanics. These parameters can be either physical ones such as coupling constants or artificial ones which are intentionally introduced such as the renormalization scale in field theories. We first derive general functional flow equations for the generating functional (grand-canonical potential) $W[J]$ of the connected diagrams. Then, we obtain functional flow equations for the one-particle irreducible ($1$PI) vertex functional (canonical potential) $\Gamma[\phi]$ by performing the Legendre transformation. By taking the functional derivatives of the flow equations, we can obtain an infinite hierarchical equations for the $1$PI vertices. We also point out that a Callan-Symanzik type equation holds among the vertices when partition function is invariant under some changes of the parameters. After discussing general aspects of parameter response, we apply our formalism to several examples and reproduce the well-known functional flow equations. Our response theory provides us a systematic and general way to obtain various functional flow equations in equilibrium systems.

The Sagnac effect in a rotating ring with Dirac fermions. (arXiv:2309.10497v1 [cond-mat.mes-hall])
A.Yu. Fesh, S.G. Sharapov

The observation of the Sagnac effect for massive material particles offers a significant enhancement in sensitivity when compared to optical interferometers with equal area and angular rotation velocity. As a result, there have been suggestions to employ solid-state interferometers that rely on semiconductors and graphene. However, in the case of monolayer graphene, its quasiparticles exhibit a linear dispersion, thus making the Sagnac effect in graphene comparable to that of for light. We investigate the Sagnac effect in the Dirac materials governed by the relativistic dispersion law and find the value of the fringe shift. The analysis reveals that optimal sensitivity is achieved in materials featuring a reduced value of Fermi velocity. Notably, the sign of the fringe shift depends on the nature of the charge carriers -- whether they are electrons or holes.

Stability of AuSn$_{4}$ compound in low temperature. (arXiv:2309.10571v1 [cond-mat.mtrl-sci])
Shivam Yadav, Sajid Sekh, Andrzej Ptok

$\mathrm{AuSn_4}$ is the example of an orthorhombic compound that exhibits topological properties. Recent XRD measurements reveal an ambiguous nature of the crystal structure, as it can be realized with either Aea2 or Ccca symmetry. Motivated by this, we analyze the dynamical stability of the compound with these symmetries. Interestingly, our main result indicates that $\mathrm{AuSn_4}$ is unstable with both Aea2 and Ccca symmetries, due to the soft modes in the phonon spectra. We find that the $\mathrm{AuSn_4}$ can be stable with Pbcm at low temperatures using the soft mode analysis. We also show that the theoretical electronic spectra are well reproduced, and have a good resemblance with the experimental ARPES spectra. Our findings may be valuable to the theoretical investigations of $\mathrm{AuSn_4}$ in future.

Electronic Properties of 2D Bilayer Antimony Oxide. (arXiv:2309.10653v1 [cond-mat.mtrl-sci])
Stefan Wolff, Roland Gillen, Janina Maultzsch

Antimony shows promise as a two-dimensional (2D) mono-elemental crystal, referred to as antimonene. When exposed to ambient conditions, antimonene layers react with oxygen, forming new crystal structures, leading significant changes in electronic properties. These changes are influenced by the degree of oxidation. Utilizing Density Functional Theory (DFT) calculations, stable configurations of bilayer antimony oxide and their corresponding electronic properties are studied. Additionally, different stacking arrangements and their effects on the physical properties of the materials are investigated. Furthermore, the analysis encompasses strain-free hetero-bilayers containing both pristine and oxidized antimonene layers, aiming to understand the interplay between these materials and their collective impact on the bilayer properties. Our results provide insight into how the properties of antimony-based bilayer structures can be modified by adjusting stoichiometry and stacking configurations.

Ni/Bi bilayers: The effect of thickness on the superconducting properties. (arXiv:2309.10705v1 [cond-mat.supr-con])
Gabriel Sant'ana, David Möckli, Alexandre da Cas Viegas, Paulo Pureur, Milton A. Tumelero

Nickel/Bismuth (Ni/Bi) bilayers have recently attracted attention due to the occurrence of time-reversal symmetry breaking in the superconducting state. Here, we report on the structural, magnetic and electric characterization of thin film Ni/Bi bilayers with several Bi thicknesses. We observed the formation of a complex layered structure depending on the Bi thickness caused by the inter-diffusion of Bi and Ni which leads to the stabilization of NiBi$_{3}$ at the Bi/Ni interface. The superconducting transition temperature and the transition width are highly dependent on the Bi thickness and the layer structure. Magnetoelectric transport measurements in perpendicular and parallel magnetic fields were used to investigate the temperature-dependent upper critical field within the framework of the anisotropic Ginzburg-Landau theory and the Werthamer Helfand Hohenberg model. For thicker samples, we observed a conventional behavior, similar to that shown by NiBi$_{3}$ bulk samples, including a small Maki parameter ($\alpha_{M}$ = 0), no spin-orbit scattering ($\lambda_{SO}$= 0) and nearly isotropic coherence length ($\gamma$ = $\xi_{\perp}$(0)/$\xi_{\parallel}$(0) $\approx$ 1). The values obtained for these properties are close to those characterizing NiBi$_{3}$ single crystals. On the other hand, in very thin samples the Maki parameter increases to about $\alpha_{M}$ = 2.8. In addition, the coherence length becomes anisotropic ($\gamma$ = 0.32) and spin-orbit scattering ($\lambda_{SO}$= 1.2) must be taken into account. Our results unequivocally show that the properties characterizing the superconducting state in the Ni/Bi are strongly dependent on the sample thickness.

Chirality-inverted Dzyaloshinskii-Moriya interaction. (arXiv:2309.10751v1 [cond-mat.mes-hall])
Khalil Zakeri, Alberto Marmodoro, Albrecht von Faber, Sergiy Mankovsky, Hubert Ebert

The Dzyaloshinskii-Moriya interaction (DMI) is an antisymmetric exchange interaction, which is responsible for the formation of topologically protected spin textures in chiral magnets. Here, by measuring the dispersion relation of the DM energy, we quantify the atomistic DMI in a model system, i.e., a Co double layer on Ir(001). We unambiguously demonstrate the presence of a chirality-inverted DMI, i.e., a sign change in the chirality index of DMI from negative to positive, when comparing the interaction between nearest neighbors to that between neighbors located at longer distances. The effect is in analogy to the change in the character of the Heisenberg exchange interaction from, e.g., ferromagnetic to antiferromagnetic. We show that the pattern of the atomistic DMI in epitaxial magnetic structures can be very complex and provide critical insights into the nature of DMI. We anticipate that the observed effect is general and occurs in many magnetic nanostructures grown on heavy-element metallic substrates.

Engineering skyrmion from spin spiral in transition metal multilayers. (arXiv:2309.10752v1 [cond-mat.mtrl-sci])
Banasree Sadhukhan

Skyrmions having topologically protected field configurations with particle-like properties play an important role in various field of science. Our present study focus on the generation of skyrmion from spin spiral in the magnetic multilayers of 4d-Fe/Ir(111) with 4d = Y, Zr, Nb, Mo, Ru, Rh. Here we investigate the impact of 4d transition metals on the isotropic Heisenberg exchanges and anti-symmetric Dzyaloshinskii-Moriya interactions originating from the broken inversion symmetry at the interface of 4d-Fe/Ir(111) multilayers. We find a strong exchange frustration due to the hybridization of the Fe-3d layer with both 4d and Ir-5d layers which modifies due to band filling effects of the 4d transition metals. We strengthen the analysis of exchange frustration by shedding light on the orbital decomposition of isotropic exchange interactions of Fe-3d orbitals. Our spin dynamics and Monte Carlo simulations indicate that the magnetic ground state of 4d-Fe/Ir(111) transition multilayers is a spin spiral in the $ab$-plane with a period of 1 to 2.5 nm generated by magnetic moments of Fe atoms and propagating along the $a$-direction. The spiral wavelengths in Y-Fe/Ir(111) are much larger compared to Rh-Fe/Ir(111). In order to manipulate the skyrmion phase in 4d-Fe/Ir(111), we investigate the magnetic ground state of 4d-Fe/Ir(111) transition multilayers with different external magnetic field. An increasing external magnetic field of $\sim$ 12 T is responsible for deforming the spin spiral into a isolated skyrmion which flips into skyrmion lattice phase around $\sim$ 18 T in Rh-Fe/Ir(111). Our study predict that the stability of magnetic skyrmion phase in Rh-Fe/Ir(111) against thermal fluctuations is upto temperature T $\leq 90$ K.

Thermoelectric response in two-dimensional nodal-point semimetals. (arXiv:2309.10763v1 [cond-mat.mes-hall])
Ipsita Mandal, Kush Saha

In this review, we discuss the computation of thermoelectric properties in two-dimensional (2D) nodal-point semimetals with two bands, and show that the expressions of the thermoelectric coefficients take different values depending on the nature of the scattering mechanism responsible for transport. We consider scatterings arising from short-ranged disorder potential and screened charged impurities. In all the cases considered, an anisotropy in the band spectrum invariably affects the thermopower quite significantly. We illustrate this by comparing the results for a semi-Dirac semimetal with those for the isotropic case (captured by the dispersion of a single valley of graphene). We also consider the scenario when a magnetic field of magnitude $B$ is applied perpendicular to the plane of the 2D semimetal. For a weak external magnetic field, when we can ignore the formation of Landau levels, a complex dependence of the thermopower on $B$ emerges for the anisotropic case. We also describe the behaviour of the thermoelectric coefficients in the presence of a strong quantizing magnetic field. Overall, the interplay of anisotropy and strengths of the external fields provides a promising platform for achieving high thermoelectric figure-of-merit.

Thermopower in an anisotropic two-dimensional Weyl semimetal. (arXiv:1811.04952v5 [cond-mat.mes-hall] UPDATED)
Ipsita Mandal, Kush Saha

We investigate the generation of an electric current from a temperature gradient in a two-dimensional Weyl semimetal with anisotropy, in both the presence and absence of a quantizing magnetic field. We show that the anisotropy leads to doping dependences of thermopower and thermal conductivities which are different from those in isotropic Dirac materials. Additionally, we find that a quantizing magnetic field in such systems leads to an interesting magnetic field dependence of the longitudinal thermopower, resulting in unsaturated thermoelectric coefficients. Thus the results presented here will serve as a guide to achieving high thermopower and a thermoelectric figure-of-merit in graphene-based materials, as well as organic conductors such as $\alpha$-(BEDT-TTF)$_2$I$_3$.

Quantum error correction with fractal topological codes. (arXiv:2201.03568v3 [quant-ph] UPDATED)
Arpit Dua, Tomas Jochym-O'Connor, Guanyu Zhu

Recently, a class of fractal surface codes (FSCs), has been constructed on fractal lattices with Hausdorff dimension $2+\epsilon$, which admits a fault-tolerant non-Clifford CCZ gate. We investigate the performance of such FSCs as fault-tolerant quantum memories. We prove that there exist decoding strategies with non-zero thresholds for bit-flip and phase-flip errors in the FSCs with Hausdorff dimension $2+\epsilon$. For the bit-flip errors, we adapt the sweep decoder, developed for string-like syndromes in the regular 3D surface code, to the FSCs by designing suitable modifications on the boundaries of the holes in the fractal lattice. Our adaptation of the sweep decoder for the FSCs maintains its self-correcting and single-shot nature. For the phase-flip errors, we employ the minimum-weight-perfect-matching (MWPM) decoder for the point-like syndromes. We report a sustainable fault-tolerant threshold ($\sim 1.7\%$) under phenomenological noise for the sweep decoder and the code capacity threshold (lower bounded by $2.95\%$) for the MWPM decoder for a particular FSC with Hausdorff dimension $D_H\approx2.966$. The latter can be mapped to a lower bound of the critical point of a confinement-Higgs transition on the fractal lattice, which is tunable via the Hausdorff dimension.

Fubini-Study metric and topological properties of flat band electronic states: the case of an atomic chain with $s-p$ orbitals. (arXiv:2303.02126v3 [cond-mat.str-el] UPDATED)
Abdiel Espinosa-Champo, Gerardo G. Naumis

The topological properties of the flat band states of a one-electron Hamiltonian that describes a chain of atoms with $s-p$ orbitals are explored. This model is mapped onto a Kitaev-Creutz type model, providing a useful framework to understand the topology through a nontrivial winding number and the geometry introduced by the \textit{Fubini-Study (FS)} metric. This metric allows us to distinguish between pure states of systems with the same topology and thus provides a suitable tool for obtaining the fingerprint of flat bands. Moreover, it provides an appealing geometrical picture for describing flat bands as it can be associated with a local conformal transformation over circles in a complex plane. In addition, the presented model allows us to relate the topology with the formation of Compact Localized States (CLS) and pseudo-Bogoliubov modes. Also, the properties of the squared Hamiltonian are investigated in order to provide a better understanding of the localization properties and the spectrum. The presented model is equivalent to two coupled SSH chains under a change of basis.

Neural networks trained on synthetically generated crystals can extract structural information from ICSD powder X-ray diffractograms. (arXiv:2303.11699v3 [cond-mat.mtrl-sci] UPDATED)
Henrik Schopmans, Patrick Reiser, Pascal Friederich

Machine learning techniques have successfully been used to extract structural information such as the crystal space group from powder X-ray diffractograms. However, training directly on simulated diffractograms from databases such as the ICSD is challenging due to its limited size, class-inhomogeneity, and bias toward certain structure types. We propose an alternative approach of generating synthetic crystals with random coordinates by using the symmetry operations of each space group. Based on this approach, we demonstrate online training of deep ResNet-like models on up to a few million unique on-the-fly generated synthetic diffractograms per hour. For our chosen task of space group classification, we achieved a test accuracy of 79.9% on unseen ICSD structure types from most space groups. This surpasses the 56.1% accuracy of the current state-of-the-art approach of training on ICSD crystals directly. Our results demonstrate that synthetically generated crystals can be used to extract structural information from ICSD powder diffractograms, which makes it possible to apply very large state-of-the-art machine learning models in the area of powder X-ray diffraction. We further show first steps toward applying our methodology to experimental data, where automated XRD data analysis is crucial, especially in high-throughput settings. While we focused on the prediction of the space group, our approach has the potential to be extended to related tasks in the future.

Epitaxial monolayers of magnetic 2D semiconductor FeBr$_{2}$ grown on Au(111). (arXiv:2304.11972v2 [cond-mat.mtrl-sci] UPDATED)
S. E. Hadjadj, C. González-Orellana, J. Lawrence, D. Bikaljević, M. Peña-Díaz, P. Gargiani, L. Aballe, J. Naumann, M. Á. Niño, M. Foerster, S. Ruiz-Gómez, S. Thakur, I. Kumberg, J. Taylor, J. Hayes, J. Torres, C. Luo, F. Radu, D. G. de Oteyza, W. Kuch, J. I. Pascual, C. Rogero, M. Ilyn

Magnetic two-dimensional (2D) semiconductors have attracted a lot of attention because modern preparation techniques are capable of providing single crystal films of these materials with precise control of thickness down to the single-layer limit. It opens up a way to study rich variety of electronic and magnetic phenomena with promising routes towards potential applications. We have investigated the initial stages of epitaxial growth of the magnetic van der Waals semiconductor FeBr\textsubscript{2} on a single-crystal Au(111) substrate by means of low-temperature scanning tunneling microscopy, low-energy electron diffraction, x-ray photoemission spectroscopy, low-energy electron emission microscopy and x-ray photoemission electron microscopy. Magnetic properties of the one- and two-layer thick films were measured via x-ray absorption spectroscopy/x-ray magnetic circular dichroism. Our findings show a striking difference in the magnetic behaviour of the single layer of FeBr\textsubscript{2} and its bulk counterpart, which can be attributed to the modifications in the crystal structure due to the interaction with the substrate.

Measuring irreversibility from learned representations of biological patterns. (arXiv:2305.19983v2 [cond-mat.stat-mech] UPDATED)
Junang Li, Chih-Wei Joshua Liu, Michal Szurek, Nikta Fakhri

Thermodynamic irreversibility is a crucial property of living matter. Irreversible processes maintain spatiotemporally complex structures and functions characteristic of living systems. In high-dimensional biological dynamics, robust and general quantification of irreversibility remains a challenging task due to experimental noise and nonlinear interactions coupling many degrees of freedom. Here we use deep learning to identify tractable, low-dimensional representations of phase-field patterns in a canonical protein signaling process -- the Rho-GTPase system -- as well as complex Ginzburg-Landau dynamics. We show that factorizing variational autoencoder neural networks learn informative pattern features robustly to noise. Resulting neural-network representations reveal signatures of mesoscopic broken detailed balance and time-reversal asymmetry in Rho-GTPase and complex Ginzburg-Landau wave dynamics. Applying the compression-based Ziv-Merhav estimator of irreversibility to representations, we recover irreversibility trends across complex Ginzburg-Landau patterns varying widely in spatiotemporal frequency and noise level. Irreversibility estimates from representations similarly recapitulate cell-activity trends in a Rho-GTPase patterning system undergoing metabolic inhibition. Additionally, we find that our irreversibility estimates serve as a dynamical order parameter, distinguishing stable and chaotic dynamics in these nonlinear systems. Our framework leverages advances in deep learning to offer robust, model-free measurements of nonequilibrium and nonlinear behavior in complex living processes.

On Weyl Nodes in Ferromagnetic Weyl Semimetal. (arXiv:2306.07882v3 [cond-mat.mes-hall] UPDATED)
Udai Prakash Tyagi, Partha Goswami

The ferromagnetic Weyl semimetals, such as Co3Sn2S2, feature pairs of Weyl points characterized by the opposite chiralities.We model this type of semimetals by the inversion symmetry protected and the time reversal symmetry broken Bloch Hamiltonian. It involves terms representing the tunnelling effect, exchange field corresponding to the ferromagnetic order, chirality index of Weyl points with related energy parameters, and the angle formed by the spin magnetic moments and the axis perpendicular to the system-plane. While for the in-plane spin moment order the Weyl nodes are absent at some points of the first Brillouin zone , the bands of opposite chirality non-linearly cross each other with band inversion at Weyl points for the spin moment order along the perpendicular axis. The absence of linearity implies that the system is unable to host massless Weyl fermions. We also show that, in the absence of the exchange field, the incidence of the circularly polarized radiation leads to the emergence of a novel state with broken time reversal symmetry.

Large Deviations Beyond the Kibble-Zurek Mechanism. (arXiv:2307.02524v2 [quant-ph] UPDATED)
Federico Balducci, Mathieu Beau, Jing Yang, Andrea Gambassi, Adolfo del Campo

The Kibble-Zurek mechanism (KZM) predicts that the average number of topological defects generated upon crossing a continuous or quantum phase transition obeys a universal scaling law with the quench time. Fluctuations in the defect number near equilibrium are approximately of Gaussian form, in agreement with the central limit theorem. Using large deviations theory, we characterize the universality of fluctuations beyond the KZM and report the exact form of the rate function in the transverse-field quantum Ising model. In addition, we characterize the scaling of large deviations in an arbitrary continuous phase transition, building on recent evidence establishing the universality of the defect number distribution.

The mass of simple and higher-order networks. (arXiv:2309.07851v2 [cond-mat.dis-nn] UPDATED)
Ginestra Bianconi

We propose a theoretical framework that explains how the mass of simple and higher-order networks emerges from their topology and geometry. We use the discrete topological Dirac operator to define an action for a massless self-interacting topological Dirac field inspired by the Nambu-Jona Lasinio model. The mass of the network is strictly speaking the mass of this topological Dirac field defined on the network; it results from the chiral symmetry breaking of the model and satisfies a self-consistent gap equation. Interestingly, it is shown that the mass of a network depends on its spectral properties, topology, and geometry. Due to the breaking of the matter-antimatter symmetry observed for the harmonic modes of the discrete topological Dirac operator, two possible definitions of the network mass can be given. For both possible definitions, the mass of the network comes from a gap equation with the difference among the two definitions encoded in the value of the bare mass. Indeed, the bare mass can be determined either by the Betti number $\beta_0$ or by the Betti number $\beta_1$ of the network. We provide numerical results on the mass of different networks, including random graphs, scale-free, and real weighted collaboration networks. We also discuss the generalization of these results to higher-order networks, defining the mass of simplicial complexes. The observed dependence of the mass of the considered topological Dirac field with the topology and geometry of the network could lead to interesting physics in the scenario in which the considered Dirac field is coupled with a dynamical evolution of the underlying network structure.

Found 13 papers in prb
Date of feed: Wed, 20 Sep 2023 03:17:11 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Effect of screening on the relaxation dynamics in a Coulomb glass
Preeti Bhandari, Vikas Malik, and Moshe Schechter
Author(s): Preeti Bhandari, Vikas Malik, and Moshe Schechter

This paper examines the relaxation dynamics of a two-dimensional Coulomb glass lattice model with high disorder. The study aims to investigate the effects of disorder and Coulomb interactions on glassy dynamics by computing the eigenvalue distribution of the linear dynamical matrix using the mean-fi…

[Phys. Rev. B 108, 094208] Published Tue Sep 19, 2023

Spatiotemporally ordered patterns in a chain of coupled dissipative kicked rotors
Angelo Russomanno
Author(s): Angelo Russomanno

In this paper we consider the dynamics of a chain of many coupled kicked rotors with dissipation. We map a rich phase diagram with many dynamical regimes. We focus mainly on a regime where the system shows period doubling, and forms patterns that are persistent and depend on the stroboscopic time wi…

[Phys. Rev. B 108, 094305] Published Tue Sep 19, 2023

ac Josephson effect in a gate-tunable ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ nanowire superconducting weak link
R. Haller, M. Osterwalder, G. Fülöp, J. Ridderbos, M. Jung, and C. Schönenberger
Author(s): R. Haller, M. Osterwalder, G. Fülöp, J. Ridderbos, M. Jung, and C. Schönenberger

Experimental signatures of topological superconductivity have been notoriously difficult to verify, even though they are actively being researched. Here, the authors use nanowires of Cd3As2 – a Dirac semimetal – to hunt for these signatures by simultaneously looking at Josephson radiation and Shapiro patterns at different doping levels. By cross-checking the experimental results with an extensive (RCSJ) model that includes thermal noise, it is concluded that trivial supercurrent dominates and that topological supercurrent, if existent, falls below the detection limit of the setup.

[Phys. Rev. B 108, 094514] Published Tue Sep 19, 2023

Dynamical Hall responses of disordered superconductors
Alberto Hijano, Sakineh Vosoughi-nia, F. Sebastián Bergeret, Pauli Virtanen, and Tero T. Heikkilä
Author(s): Alberto Hijano, Sakineh Vosoughi-nia, F. Sebastián Bergeret, Pauli Virtanen, and Tero T. Heikkilä

We extend the Mattis-Bardeen theory for the dynamical response of superconductors to include different types of Hall responses. This is possible thanks to a recent modification of the quasiclassical Usadel equation, which allows for analyzing Hall effects in disordered superconductors and including …

[Phys. Rev. B 108, 104506] Published Tue Sep 19, 2023

Interplay between altermagnetism and nonsymmorphic symmetries generating large anomalous Hall conductivity by semi-Dirac points induced anticrossings
Amar Fakhredine, Raghottam M. Sattigeri, Giuseppe Cuono, and Carmine Autieri
Author(s): Amar Fakhredine, Raghottam M. Sattigeri, Giuseppe Cuono, and Carmine Autieri

We investigate the interplay between altermagnetic spin-splitting and nonsymmorphic symmetries using the space group No. 62 as a testbed. Studying different magnetic orders by means of first-principles calculations, we find that the altermagnetism (AM) is present in the $C$-type magnetic configurati…

[Phys. Rev. B 108, 115138] Published Tue Sep 19, 2023

Symmetric mass generation of Kähler-Dirac fermions from the perspective of symmetry-protected topological phases
Yuxuan Guo and Yi-Zhuang You
Author(s): Yuxuan Guo and Yi-Zhuang You

The Kähler-Dirac fermion, recognized as an elegant geometric approach, offers an alternative to traditional representations of relativistic fermions. Recent studies have demonstrated that symmetric mass generation (SMG) can precisely occur with two copies of Kähler-Dirac fermions across any space-ti…

[Phys. Rev. B 108, 115139] Published Tue Sep 19, 2023

Experimental demonstration of splitting rules for exceptional points and their topological characterization
Yi-Xin Xiao, Jing Hu, Zhao-Qing Zhang, and C. T. Chan
Author(s): Yi-Xin Xiao, Jing Hu, Zhao-Qing Zhang, and C. T. Chan

This work establishes clear relationships between how exceptional points of varying orders split and which parts of the system are perturbed. Additionally, two topological invariants are identified to fully characterize the various splitting behavior. These findings provide a comprehensive understanding of how exceptional points split in various non-Hermitian systems, and can help optimize the performance of sensors that rely on exceptional points.

[Phys. Rev. B 108, 115427] Published Tue Sep 19, 2023

Multiple types of unconventional quasiparticles in the chiral crystal ${\mathrm{CsBe}}_{2}{\mathrm{F}}_{5}$
Xin-Yue Kang, Jin-Yang Li, and Si Li
Author(s): Xin-Yue Kang, Jin-Yang Li, and Si Li

Unconventional topological quasiparticles have recently garnered significant attention in the realm of condensed matter physics. Here, based on first-principles calculations and symmetry analysis, we reveal the coexistence of multiple types of interesting unconventional topological quasiparticles in…

[Phys. Rev. B 108, 125127] Published Tue Sep 19, 2023

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)
Rémi Bretel, Séverine Le Moal, Hamid Oughaddou, and Eric Le Moal
Author(s): Rémi Bretel, Séverine Le Moal, Hamid Oughaddou, and Eric Le Moal

We report on the growth of one-dimensional (1D) chains of the prochiral quinacridone (QA) molecule on ultrathin KCl films on Cu(111) in ultrahigh vacuum. Using low-temperature scanning tunneling microscopy (STM), we observe straight homochiral 1D chains of QA molecules on one (1L), two (2L), and thr…

[Phys. Rev. B 108, 125423] Published Tue Sep 19, 2023

Kerr, Faraday, and magnetoelectric effects in ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ thin films
Chao Lei and Allan H. MacDonald
Author(s): Chao Lei and Allan H. MacDonald

The topological magnetoelectric effect (TME) is a characteristic property of topological insulators. In this paper, we use a simplified coupled-Dirac-cone electronic structure model to theoretically evaluate the THz and far infrared Kerr and Faraday responses of thin films of ${\mathrm{MnBi}}_{2}{\m…

[Phys. Rev. B 108, 125424] Published Tue Sep 19, 2023

Self-surfactant effect in graphene growth on Pt(111)
Xingxing Dong, Changchun He, Chao He, Xiaowei Liang, Shaogang Xu, and Hu Xu
Author(s): Xingxing Dong, Changchun He, Chao He, Xiaowei Liang, Shaogang Xu, and Hu Xu

Graphene, a material with exceptional physicochemical properties, has been synthesized on a variety of substrates. However, prior theoretical studies have suggested that carbon (C) clusters are typically less stable thermodynamically compared to individual C monomers on most transition metal substra…

[Phys. Rev. B 108, 125425] Published Tue Sep 19, 2023

Chirality-inverted Dzyaloshinskii-Moriya interaction
Khalil Zakeri, Alberto Marmodoro, Albrecht von Faber, Sergiy Mankovsky, and Hubert Ebert
Author(s): Khalil Zakeri, Alberto Marmodoro, Albrecht von Faber, Sergiy Mankovsky, and Hubert Ebert

The Dzyaloshinskii-Moriya interaction (DMI) is an antisymmetric exchange interaction, which is responsible for the formation of topologically protected spin textures in chiral magnets. Here, by measuring the dispersion relation of the DM energy, we quantify the atomistic DMI in a model system, i.e.,…

[Phys. Rev. B 108, L100403] Published Tue Sep 19, 2023

Fractal and subharmonic responses driven by surface acoustic waves during charge density wave sliding
Yu Funami and Kazushi Aoyama
Author(s): Yu Funami and Kazushi Aoyama

We theoretically investigate the effects of surface acoustic waves (SAWs) on an electric-field-driven sliding motion of a one-dimensional charge density wave (CDW), which is initially pinned by impurities. By numerically analyzing an extended Fukuyama-Lee-Rice model, we show that a mechanical vibrat…

[Phys. Rev. B 108, L100508] Published Tue Sep 19, 2023

Found 1 papers in prl
Date of feed: Wed, 20 Sep 2023 03:17:11 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Reversing Unknown Qubit-Unitary Operation, Deterministically and Exactly
Satoshi Yoshida, Akihito Soeda, and Mio Murao
Author(s): Satoshi Yoshida, Akihito Soeda, and Mio Murao

We report a deterministic and exact protocol to reverse any unknown qubit-unitary operation, which simulates the time inversion of a closed qubit system. To avoid known no-go results on universal deterministic exact unitary inversion, we consider the most general class of protocols transforming unkn…

[Phys. Rev. Lett. 131, 120602] Published Tue Sep 19, 2023

Found 1 papers in nano-lett
Date of feed: Tue, 19 Sep 2023 13:07:13 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

[ASAP] Increased Mobility and Reduced Hysteresis of MoS2 Field-Effect Transistors via Direct Surface Precipitation of CsPbBr3-Nanoclusters for Charge Transfer Doping
Yae Zy Kang, Gwang Hwi An, Min-Gi Jeon, So Jeong Shin, Su Jin Kim, Min Choi, Jae Baek Lee, Tae Yeon Kim, Ikhwan Nur Rahman, Hyun Young Seo, Seyoung Oh, Byungjin Cho, Jihoon Choi, and Hyun Seok Lee

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02293

Found 1 papers in sci-rep

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

New-designed 3D printed surgical guide promotes the accuracy of endodontic microsurgery: a study of 14 upper anterior teeth
Sijing Xie

Scientific Reports, Published online: 19 September 2023; doi:10.1038/s41598-023-42767-x

New-designed 3D printed surgical guide promotes the accuracy of endodontic microsurgery: a study of 14 upper anterior teeth

Found 2 papers in nat-comm

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Dynamically tuning friction at the graphene interface using the field effect
< author missing >

Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa4
< author missing >