論文

査読有り
2019年2月

Topological classification under nonmagnetic and magnetic point group symmetry: Application of real-space Atiyah-Hirzebruch spectral sequence to higher-order topology

PHYSICAL REVIEW B
  • Nobuyuki Okuma
  • ,
  • Masatoshi Sato
  • ,
  • Ken Shiozaki

99
8
開始ページ
085127
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.99.085127
出版者・発行元
AMER PHYSICAL SOC

We classify time-reversal breaking (class A) spinful topological crystalline insulators with crystallographic nonmagnetic (32 types) and magnetic (58 types) point groups. The classification includes all possible magnetic topological crystalline insulators protected by point group symmetry. Whereas the classification of topological insulators is known to be given by the K-theory in the momentum space, computation of the K-theory has been a difficult task in the presence of complicated crystallographic symmetry. Here we consider the K-homology in the real space for this problem, instead of the K-theory in the momentum space, both of which give the same topological classification. We apply the Atiyah-Hirzebruch spectral sequence (AHSS) for computation of the K-homology, which is a mathematical tool for generalized (co)homology. In the real-space picture, the AHSS naturally gives the classification of higher-order topological insulators at the same time. By solving the group extension problem in the AHSS on the basis of physical arguments, we completely determine possible topological phases including higher-order ones for each point group. Relationships among different higher-order topological phases are argued in terms of the AHSS in the K-homology. We find that in some nonmagnetic and magnetic point groups, a stack of two Z(2) second-order topological insulators can be smoothly deformed into nontrivial fourth-order topological insulators, which implies nontrivial group extensions in the AHSS.

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.99.085127
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000458859100004&DestApp=WOS_CPL
URL
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.085127
ID情報
  • DOI : 10.1103/PhysRevB.99.085127
  • ISSN : 2469-9950
  • eISSN : 2469-9969
  • Web of Science ID : WOS:000458859100004

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