Avoided level crossing at the magnetic field induced topological phase transition due to spin-orbital mixing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10387102" target="_blank" >RIV/00216208:11320/18:10387102 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.98.161202" target="_blank" >https://doi.org/10.1103/PhysRevB.98.161202</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.98.161202" target="_blank" >10.1103/PhysRevB.98.161202</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Avoided level crossing at the magnetic field induced topological phase transition due to spin-orbital mixing

Popis výsledku v původním jazyce

In three-dimensional topological insulators, an effective closure of the bulk energy gap with increasing magnetic field expected at a critical point can yield a band crossing at a gapless Dirac node. Using high-field magneto-optical Landau-level spectroscopy on the topological crystalline insulator Pb1-xSnxSe, we demonstrate that such a gap closure does not occur, and an avoided crossing is observed as the magnetic field is swept through the critical field. We attribute this anticrossing to orbital parity and spin mixing of the N = 0 levels. Concurrently, we observe no gap closure at the topological phase transition versus temperature suggesting that both are due to a single, likely extrinsic, mechanism.

Název v anglickém jazyce

Avoided level crossing at the magnetic field induced topological phase transition due to spin-orbital mixing

Popis výsledku anglicky

In three-dimensional topological insulators, an effective closure of the bulk energy gap with increasing magnetic field expected at a critical point can yield a band crossing at a gapless Dirac node. Using high-field magneto-optical Landau-level spectroscopy on the topological crystalline insulator Pb1-xSnxSe, we demonstrate that such a gap closure does not occur, and an avoided crossing is observed as the magnetic field is swept through the critical field. We attribute this anticrossing to orbital parity and spin mixing of the N = 0 levels. Concurrently, we observe no gap closure at the topological phase transition versus temperature suggesting that both are due to a single, likely extrinsic, mechanism.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

—

Svazek periodika

98

Číslo periodika v rámci svazku

16

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

—

Kód UT WoS článku

000447090000003

EID výsledku v databázi Scopus

2-s2.0-85054928673