Topological States on Interfaces Protected by Symmetry

Nonfiction, Science & Nature, Technology, Superconductors & Superconductivity, Science, Physics, Solid State Physics
Cover of the book Topological States on Interfaces Protected by Symmetry by Ryuji Takahashi, Springer Japan
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Author: Ryuji Takahashi ISBN: 9784431555346
Publisher: Springer Japan Publication: April 10, 2015
Imprint: Springer Language: English
Author: Ryuji Takahashi
ISBN: 9784431555346
Publisher: Springer Japan
Publication: April 10, 2015
Imprint: Springer
Language: English

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.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

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.

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