[9a-E207-1~9] 10.4 半導体・トポロジカル・超伝導・強相関スピントロニクス

11:45 〜 12:00奨励賞エントリー英語発表

[9a-E207-9] Direct Observation of Double Dirac-Cone Crossings and Strain-Enhanced Nontrivial Band Gap in a Pb_1-xSn_xTe (001) Thin Film

〇Takuya Takashiro^1,2, Gauthier Krizman³, Mahdi Hajlaoui², Tetiana Zakusylo², Ondrej Caha⁴, Lakshmi Sajeev⁴, Marcin Rosmus⁵, Natalia Olszowska⁵, Dawid Wutke⁵, Guenther Bauer², Gunther Springholz² (1.Tohoku Univ., 2.JKU, 3.Univ. PSL, 4.Masaryk Univ., 5.SOLARIS)

キーワード：

topological crystalline insulators、Angle-resolved photoemission spectroscopy、epitaxial thin films

Pb_1-xSn_xTe, a IV-VI narrow-gap semiconductor, has recently been recognized as topological crystalline insulators (TCIs) that exhibit multiple Dirac cones and ferroelectric behavior. In this talk, we report the first observation of multiple Dirac-cone crossings in a (001)-oriented Pb_1-xSn_xTe thin film via Pb deposition onto the surface. We also determine the nontrivial band gap and demonstrate its enhancement by epitaxial strain in the thin film.