Stanene (single-layer grey tin), with an electronic structure akin to that of graphene but exhibiting a much larger spin-orbit gap, offers a promising platform for room-temperature electronics based on the quantum spin Hall (QSH) effect. This material has received much theoretical attention, but a suitable substrate for stanene growth that results in an overall gapped electronic structure has been elusive; a sizable gap is necessary for room-temperature applications. Here, we report a study of stanene epitaxially grown on the (111)B-face of indium antimonide (InSb). Angle-resolved photoemission spectroscopy (ARPES) measurements reveal a gap of 0.44 eV, in agreement with our first-principles calculations. The results indicate that stanene on InSb(111) is a strong contender for electronic QSH applications.
@article{arxiv.1711.08523,
title = {Gapped Electronic Structure of Epitaxial Stanene on InSb(111)},
author = {Cai-Zhi Xu and Yang-Hao Chan and Peng Chen and Xiaoxiong Wang and David Flötotto and Joseph Andrew Hlevyack and Guang Bian and Sung-Kwan Mo and Mei-Yin Chou and Tai-Chang Chiang},
journal= {arXiv preprint arXiv:1711.08523},
year = {2018}
}