Symmetry conditions of a nodal superconductor for generating robust flat-band Andreev bound states at its dirty surface

被引：8

作者：

Ikegaya, Satoshi ^{[1
]}

Kobayashi, Shingo ^{[2
,3
]}

Asano, Yasuhiro ^{[1
,4
,5
]}

机构：

[1] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan

[2] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

[3] Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648601, Japan

[4] Hokkaido Univ, Ctr Topol Sci & Technol, Sapporo, Hokkaido 0608628, Japan

[5] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia

来源：

PHYSICAL REVIEW B | 2018年 / 97卷 / 17期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

D-WAVE SUPERCONDUCTORS; HIGH-TEMPERATURE SUPERCONDUCTORS; TOPOLOGICAL INSULATORS; P-WAVE;

D O I：

10.1103/PhysRevB.97.174501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We discuss the symmetry property of a nodal superconductor that hosts robust flat-band zero-energy states at its surface under potential disorder. Such robust zero-energy states are known to induce the anomalous proximity effect in a dirty normal metal attached to a superconductor. A recent study has shown that a topological index N-ZES describes the number of zero-energy states at the dirty surface of a p-wave superconductor. We generalize the theory to clarify the conditions required for a superconductor that enables N-ZES not equal 0. Our results show that N-ZES not equal 0 is realized in a topological material that belongs to either the BDI or CII class. We also present two realistic Hamiltonians that result in N-ZES not equal 0.

引用

页数：9