title: New type of quantum spin Hall insulators in hydrogenated PbSn thin films.
abstract: The realization of a quantum spin Hall (QSH) insulator working at high temperature is of both scientific and technical interest since it supports spin-polarized and dssipationless edge states. Based on first-principle calculations, we predicted that the two-dimensional (2D) binary compound of lead and tin (PbSn) in a buckled honeycomb framework can be tuned into a topological insulator with huge a band gap and structural stability via hydrogenation or growth on special substrates. This heavy-element-based structure is sufficiently ductile to survive the 18 ps molecular dynamics (MD) annealing to 400 K, and the band gap opened by strong spin-orbital-coupling (SOC) is as large as 0.7 eV. These characteristics indicate that hydrogenated PbSn (H-PbSn) is an excellent platform for QSH realization at high temperature.
authors.affiliation: School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Liu
authors.affiliation: School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Qin
authors.affiliation: School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Jifan
authors.initials: J
authors.lastname: Hu