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政大典藏 > College of Science > Graduate Institute of Applied Physics > Periodical Articles > Item 140.119/125214

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/125214

Title:	Conductance fluctuations in disordered 2D topological insulator wires: from quantum spin-Hall to ordinary phases
Authors:	許琇娟 Hsu, Hsiu-Chuan Kleftogiannis, Ioannis Guo, Guang-Yu Gopar, Victor A.
Contributors:	應物所
Date:	2018-02
Issue Date:	2019-08-15 10:55:22 (UTC+8)
Abstract:	Impurities and defects are ubiquitous in topological insulators (TIs) and thus understanding the effects of disorder on electronic transport is important. We calculate the distribution of the random conductance fluctuations P(G) of disordered 2D TI wires modeled by the Bernevig-Hughes-Zhang (BHZ) Hamiltonian with realistic parameters. As we show, the disorder drives the TIs into different regimes: metal (M), quantum spin-Hall insulator (QSHI), and ordinary insulator (OI). By varying the disorder strength and Fermi energy, we calculate analytically and numerically P(G) across the entire phase diagram. The conductance fluctuations follow the statistics of the unitary universality class β=2. At strong disorder and high energy, however, the size of the fluctutations δG reaches the universal value of the orthogonal symmetry class (β=1). At the QSHI-M and QSHI-OI crossovers, the interplay between edge and bulk states plays a key role in the statistical properties of the conductance.
Relation:	Journal of the Physical Society of Japan, Vol.87, No.03, pp.034701
Data Type:	期刊論文
DOI link:	https://doi.org/10.7566/JPSJ.87.034701
DOI:	10.7566/JPSJ.87.034701
Appears in Collections:	[Graduate Institute of Applied Physics] Periodical Articles

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