Magneto-optical evidence of the topological phase transition in (111)-Pb1-xSnxTe

33rd International Conference on the Physics of Semiconductors

Phuphachong, T.^1 ; Assaf, B.A.^2 ; Volobuev, V.V.^3 ; Bauer, G.^3 ; Springholz, G.^3 ; De Vaulchier, L.A.^1 ; Guldner, Y.^1

Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, PSL Research University, Université Pierre et Marie Curie, Université Denis Diderot, 24 rue Lhomond, Paris

75005, France^1

Département de Physique, Ecole Normale Supérieure, CNRS, PSL Research University, 24 rue Lhomond, Paris

75005, France^2

Institut für Halbleiter und Festkörperphysik, Johannes Kepler Universität, Altenberger Strasse 69, Linz

4040, Austria^3

关键词: Band parameters;    Critical value;    Crystalline insulators;    Magneto-optical;    Massless dirac fermions;    Quantum state;    Topological phase;    Transmission spectrums;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/864/1/012038/pdf
DOI  :  10.1088/1742-6596/864/1/012038

来源: IOP

【 摘 要 】

Recently, the study of topological crystalline insulators has become of great interest in condensed matter physics. In this work, we present infrared magneto-optical investigation of such novel quantum states in narrow gap rocksalt IV-VI semiconductor Pb1-xSnxTe which exhibits a topological phase transition at a critical value xc≈0.40. High-mobility Bi-doped trivial and non-trivial (111)-Pb1-xSnxTe (0≤x≤0.56) films grown on BaF2substrates by MBE were examined at 4.5K and magnetic fields B=0-15T. Massive and massless Dirac fermion models are used to analyze transmission spectra. We are able to determine the band parameters of the bulk and the topological surface states of such material.