缩放比例
量子隧道
物理
凝聚态物理
拓扑绝缘体
拓扑(电路)
指数
量子霍尔效应
电子
量子力学
几何学
数学
语言学
组合数学
哲学
作者
Faji Xie,Shuai Zhang,Qianqian Liu,Chuanying Xi,Ting Kang,Rui Wang,Boyuan Wei,Xiaoxue Pan,Minhao Zhang,Fucong Fei,Xuefeng Wang,Li Pi,Geliang Yu,Baigeng Wang,Fengqi Song
出处
期刊:Physical review
日期:2019-02-13
卷期号:99 (8)
被引量:15
标识
DOI:10.1103/physrevb.99.081113
摘要
The scaling physics of quantum Hall transport in optimized topological insulators with a plateau precision of ~1/1000 e2/h is considered. Two exponential scaling regimes are observed in temperature-dependent transport dissipation, one of which accords with thermal activation behavior with a gap of 2.8 meV (> 20 K), the other being attributed to variable range hopping (1-20 K). Magnetic field-driven plateau-to-plateau transition gives scaling relations of (dR$_{xy}$/dB)$^{max}$ \propto T$^{-\kappa}$ and \DeltaB$^{-1}$ \propto T$^{-\kappa}$ with a consistent exponent of \kappa ~ 0.2, which is half the universal value for a conventional two-dimensional electron gas. This is evidence of percolation assisted by quantum tunneling, and reveals the dominance of electron-electron interaction of the topological surface states.
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