Symmetry Protected Weak Topological Phases in a Superlattice

被引：13

作者：

Fukui, Takahiro ^{[1
]}

Imura, Ken-Ichiro ^{[2
]}

Hatsugai, Yasuhiro ^{[3
]}

机构：

[1] Ibaraki Univ, Dept Phys, Mito, Ibaraki 3108512, Japan

[2] Hiroshima Univ, Dept Quantum Matter, AdSM, Higashihiroshima, Hiroshima 7398530, Japan

[3] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 07期

关键词：

topological insulator; superlattice; Chern number; weak topological phase; Wilson-Dirac model; INSULATORS; CLASSIFICATION; STATES;

D O I：

10.7566/JPSJ.82.073708

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We explore novel topological phases realized in a superlattice system based on the Wilson-Dirac model. Our main focus is on a two-dimensional analogue of weak topological insulator phases. We find such phases as those characterized by gapless edge states that are protected by symmetry but sensitive to the orientation of the edge relative to the superlattice structure. We show that manifest and hidden reflection symmetries protect such weak topological phases, and propose bulk Z(2) indices responsible for the topological protection of the edge states.

引用

页数：5

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