Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00099461" target="_blank" >RIV/00216224:14310/17:00099461 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1038/s41467-017-01204-0" target="_blank" >http://dx.doi.org/10.1038/s41467-017-01204-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41467-017-01204-0" target="_blank" >10.1038/s41467-017-01204-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator

Popis výsledku v původním jazyce

Topological insulators constitute a new phase of matter protected by symmetries. Time-reversal symmetry protects strong topological insulators of the Z(2) class, which possess an odd number of metallic surface states with dispersion of a Dirac cone. Topological crystalline insulators are merely protected by individual crystal symmetries and exist for an even number of Dirac cones. Here, we demonstrate that Bi-doping of Pb1-xSnxSe (111) epilayers induces a quantum phase transition from a topological crystalline insulator to a Z(2) topological insulator. This occurs because Bi-doping lifts the fourfold valley degeneracy and induces a gap at (Gamma) over bar, while the three Dirac cones at the (M) over bar points of the surface Brillouin zone remain intact. We interpret this new phase transition as caused by a lattice distortion. Our findings extend the topological phase diagram enormously and make strong topological insulators switchable by distortions or electric fields.

Název v anglickém jazyce

Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator

Popis výsledku anglicky

Topological insulators constitute a new phase of matter protected by symmetries. Time-reversal symmetry protects strong topological insulators of the Z(2) class, which possess an odd number of metallic surface states with dispersion of a Dirac cone. Topological crystalline insulators are merely protected by individual crystal symmetries and exist for an even number of Dirac cones. Here, we demonstrate that Bi-doping of Pb1-xSnxSe (111) epilayers induces a quantum phase transition from a topological crystalline insulator to a Z(2) topological insulator. This occurs because Bi-doping lifts the fourfold valley degeneracy and induces a gap at (Gamma) over bar, while the three Dirac cones at the (M) over bar points of the surface Brillouin zone remain intact. We interpret this new phase transition as caused by a lattice distortion. Our findings extend the topological phase diagram enormously and make strong topological insulators switchable by distortions or electric fields.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Communications

ISSN

2041-1723

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

„968-1“-„968-7“

Kód UT WoS článku

000413117400002

EID výsledku v databázi Scopus

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