Using scanning tunneling microscopy (STM) measurements, we have observed the closing of the topological gap in the van der Waals material ZrTe5, by applying mechanical deformations to it in the form of bubbles.
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In our recent paper published in Nature Nanotechnology, we show that the plasmon frequencies of graphene can be tuned from terahertz frequencies into the visible range. This enables extremely sensitive detection of molecules from femtomolar concentrations by Raman spectroscopy.
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