{"id":526,"date":"2022-09-02T19:42:39","date_gmt":"2022-09-02T19:42:39","guid":{"rendered":"https:\/\/www.nemeslab.com\/?p=526"},"modified":"2022-10-06T09:34:29","modified_gmt":"2022-10-06T09:34:29","slug":"rhombohedral-graphite-stm-measurement","status":"publish","type":"post","link":"https:\/\/www.nemeslab.com\/hu\/rhombohedral-graphite-stm-measurement\/","title":{"rendered":"Rombo\u00e9deres grafit p\u00e1szt\u00e1z\u00f3 alag\u00fatmikroszk\u00f3pos vizsg\u00e1lata"},"content":{"rendered":"

Krist\u00e1lyos anyagokban az elektronok egym\u00e1ssal val\u00f3 k\u00f6lcs\u00f6nhat\u00e1sa tudom\u00e1nyosan \u00e9s gyakorlati szempontb\u00f3l is izgalmas jelens\u00e9geket hoz l\u00e9tre. Ilyen effektusok a Majorana kv\u00e1zir\u00e9szecsk\u00e9k, a frakcionaliz\u00e1lt spin \u00e9s elektromos t\u00f6lt\u00e9s stb. A k\u00f6lcs\u00f6nhat\u00f3 elektronrendszereknek a jobb meg\u00e9rt\u00e9se olyan jelent\u0151s el\u0151rel\u00e9p\u00e9sekkel kecsegtet, mint a robusztus kvantum bitek el\u0151\u00e1ll\u00edt\u00e1sa, illetve a magas h\u0151m\u00e9rs\u00e9klet\u0171 szupravezet\u00e9s megval\u00f3s\u00edt\u00e1sa. Jelent\u0151s el\u0151rel\u00e9p\u00e9sek a fizik\u00e1ban \u00e1ltal\u00e1ban a legegyszer\u0171bb rendszerek tanulm\u00e1nyoz\u00e1s\u00e1b\u00f3l sz\u00e1rmaznak. Azonban a k\u00f6lcs\u00f6nhat\u00f3 elektronrendszerek eset\u00e9ben ez a fontos tudom\u00e1nyos vez\u00e9rl\u0151 elv kev\u00e9sb\u00e9 teljes\u00fcl. Az er\u0151s k\u00f6lcs\u00f6nhat\u00e1sokat mutat\u00f3 anyagok h\u00e1rom, n\u00e9gy vagy ak\u00e1r t\u00f6bb atomi komponenst tartalmaz\u00f3 bonyolult szerkezetekben krist\u00e1lyosodnak. Nemes-Incze P\u00e9ter \u00e9s csoportja megmutatta, hogy a rombo\u00e9deres grafit, tal\u00e1n a legegyszer\u0171bb krist\u00e1ly, amelyben az elektronok k\u00f6z\u00f6tti k\u00f6lcs\u00f6nhat\u00e1s er\u0151s korrel\u00e1ci\u00f3s effektusokat eredm\u00e9nyez. A grafit krist\u00e1ly csup\u00e1n sz\u00e9n atomokb\u00f3l \u00e9p\u00fcl fel \u00e9s az er\u0151s k\u00f6lcs\u00f6nhat\u00e1sok a rombo\u00e9deres grafit \u201el\u00e9pcs\u0151szer\u0171\u201d atomi szerkezet\u00e9b\u0151l fakadnak.<\/p>\n\n\n

\n
\"\"
A sz\u00e9n atomok \u201el\u00e9pcs\u0151szer\u0171\u201d l\u00e1ncait megism\u00e9telve \u00e9p\u00edthet\u0151 fel a rombo\u00e9deres grafit krist\u00e1ly.<\/figcaption><\/figure>\n<\/div>\n\n\n

Ezt a l\u00e9pcs\u0151szer\u0171 rendszere a sz\u00e9n atomoknak a fenti \u00e1br\u00e1n piros \u00e9s k\u00e9k sz\u00e9n atomok \u00e1ltal van szeml\u00e9ltetve. A k\u00fcl\u00f6nleges krist\u00e1lyszerkezet ahhoz vezet, hogy a krist\u00e1lyt hat\u00e1rol\u00f3 graf\u00e9n r\u00e9tegeken egy fel\u00fcleti elektron \u00e1llapot alakul ki. Ezt az al\u00e1bbi \u00e1br\u00e1n l\u00e1thatjuk, ahol a piros g\u00f6mb\u00f6k m\u00e9rete ar\u00e1nyos a sz\u00e9n atomokon tal\u00e1lhat\u00f3 elektron s\u0171r\u0171s\u00e9ggel.<\/p>\n\n\n\n

\n
\"Surface<\/figure>\n<\/figure>\n\n\n\n

H\u0151m\u00e9rs\u00e9kletf\u00fcgg\u0151, p\u00e1szt\u00e1z\u00f3 alag\u00fatmikroszk\u00f3pos m\u00e9r\u00e9seik alapj\u00e1n az er\u0151s korrel\u00e1ci\u00f3k legal\u00e1bb 16 Kelvin h\u0151m\u00e9rs\u00e9kletig vannak jelen a mint\u00e1ban. A p\u00e1szt\u00e1z\u00f3szond\u00e1s m\u00e9r\u00e9sek alapj\u00e1n a rombo\u00e9deres grafitban az elektronok egy k\u00fcl\u00f6nleges, \u00fan. kvantum m\u00e1gnest k\u00e9peznek, amelynek fontos tulajdons\u00e1ga, hogy egy szigetel\u0151 \u00e9s egy f\u00e9mes \u00e1llapot van egyszerre jelen a fel\u00fcleten. Ezek a m\u00e9r\u00e9sek csup\u00e1n az els\u0151 l\u00e9p\u00e9st k\u00e9pezik a rombo\u00e9deres grafit tulajdons\u00e1gainak a felt\u00e1r\u00e1s\u00e1ban \u00e9s megmutatt\u00e1k, hogy er\u0151s k\u00f6lcs\u00f6nhat\u00e1sok tanulm\u00e1nyozhat\u00f3k ebben a roppant egyszer\u0171 modell rendszerben.<\/p>\n\n\n\n

Az eredm\u00e9nyeket a Science Advances<\/a>foly\u00f3iratban publik\u00e1ltuk. A nyers adatok el\u00e9rhet\u0151ek a Figshare-en<\/a>.<\/p>\n\n\n\n

H\u00edrek az ELKH honlapj\u00e1n<\/a> and at the Helmhoz Zentrum Berlin<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

A p\u00e1szt\u00e1z\u00f3 alag\u00fatmikroszk\u00f3pos m\u00e9r\u00e9seink megmutatt\u00e1k, hogy a rombo\u00e9deres grafit fel\u00fcleti \u00e1llapot\u00e1ban er\u0151s k\u00f6lcs\u00f6nhat\u00e1sok befoly\u00e1solj\u00e1k az elektronok viselked\u00e9s\u00e9t. Az elektron rendszer t\u00f6lt\u00e9ssemleges esetben egy kvantum m\u00e1gnest alkot, amely egy \u00faj k\u00eds\u00e9rleti platform az er\u0151s k\u00f6lcs\u00f6nhat\u00e1sok vizsg\u00e1lat\u00e1ra.<\/p>","protected":false},"author":1,"featured_media":531,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[24],"tags":[19,25,21,20,16,18,14,17,12],"post_formats":[],"class_list":["post-526","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-abc-graphite","tag-flat-band","tag-magnetism","tag-quantum-magnet","tag-rhombohedral-graphite","tag-scanning-tunneling-microscopy","tag-stm","tag-strongly-correlated-electrons","tag-topology"],"guten_post_layout_featured_media_urls":{"full":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal.png",4955,1479,false],"thumbnail":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-150x150.png",150,150,true],"medium":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-300x90.png",300,90,true],"medium_large":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-768x229.png",640,191,true],"large":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-1024x306.png",640,191,true],"1536x1536":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-1536x458.png",1536,458,true],"2048x2048":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-2048x611.png",2048,611,true],"trp-custom-language-flag":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-18x5.png",18,5,true],"guten_post_layout_landscape_large":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-1200x800.png",1200,800,true],"guten_post_layout_portrait_large":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-1200x1479.png",1200,1479,true],"guten_post_layout_square_large":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-1200x1200.png",1200,1200,true],"guten_post_layout_landscape":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-600x400.png",600,400,true],"guten_post_layout_portrait":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-600x900.png",600,900,true],"guten_post_layout_square":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-600x600.png",600,600,true],"sciencexlite-blog-thumb":["https:\/\/www.nemeslab.com\/wp-content\/uploads\/2022\/07\/RG-and-hexagonal-100x80.png",100,80,true]},"_links":{"self":[{"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/posts\/526","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/comments?post=526"}],"version-history":[{"count":32,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/posts\/526\/revisions"}],"predecessor-version":[{"id":632,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/posts\/526\/revisions\/632"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/media\/531"}],"wp:attachment":[{"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/media?parent=526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/categories?post=526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/tags?post=526"},{"taxonomy":"post_format","embeddable":true,"href":"https:\/\/www.nemeslab.com\/hu\/wp-json\/wp\/v2\/post_formats?post=526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}