Topological States on Interfaces Protected by Symmetry

  • Ryuji¬†Takahashi

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xii
  2. Ryuji Takahashi
    Pages 1-4
  3. Ryuji Takahashi
    Pages 73-76
  4. Ryuji Takahashi
    Pages 77-83
  5. Ryuji Takahashi
    Pages 85-88
  6. Back Matter
    Pages 89-90

About this book


In this book, the author theoretically studies two aspects of topological states.

First, novel states arising from hybridizing surface states of topological insulators are theoretically introduced. As a remarkable example, the author shows the existence of gapless interface states at the interface between two different topological insulators, which belong to the same topological phase. While such interface states are usually gapped due to hybridization, the author proves that the interface states are in fact gapless when the two topological insulators have opposite chiralities. This is the first time that gapless topological novel interface states protected by mirror symmetry have been proposed.

Second, the author studies the Weyl semimetal phase in thin topological insulators subjected to a magnetic field. This Weyl semimetal phase possesses edge states showing abnormal dispersion, which is not observed without mirror symmetry. The author explains that the edge states gain a finite velocity by a particular form of inversion symmetry breaking, which makes it possible to observe the phenomenon by means of electric conductivity.


Chiralities of Topological Insulators Dirac Cone Gapless Topological Interface States Mirror Symmetry Surface States Thin Topological Insulators Topological Insulator Topological Invariance Weyl Semimetal Phase

Authors and affiliations

  • Ryuji¬†Takahashi
    • 1
  1. 1.Department of Applied PhysicsThe University of TokyoTokyoJapan

Bibliographic information