Conductance distributions in disordered quantum spin-Hall systems

K. Kobayashi, T. Ohtsuki, H. Obuse, K. Slevin

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We study numerically the charge conductance distributions of disordered quantum spin-Hall (QSH) systems using a quantum network model. We have found that the conductance distribution at the metal-QSH insulator transition is clearly different from that at the metal-ordinary insulator transition. Thus the critical conductance distribution is sensitive not only to the boundary condition but also to the presence of edge states in the adjacent insulating phase. We have also calculated the point-contact conductance. Even when the two-terminal conductance is approximately quantized, we find large fluctuations in the point-contact conductance. Furthermore, we have found a semicircular relation between the average of the point-contact conductance and its fluctuation.

Original languageEnglish
Article number165301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number16
DOIs
Publication statusPublished - 2010 Oct 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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