摘要
石墨烯研究的巨大成功推动了二维晶体材料研究领域的蓬勃发展,和碳同族的Ⅳ族元素组成的具有类石墨烯结构的二维晶体材料受到了广泛的关注,其中由锡元素组成的锡烯晶体由于其优异的物理特性成为研究的热点之一.理论计算表明锡烯是一种大能隙的量子自旋霍尔效应绝缘体,还能够转化为二维的拓扑超导体.锡烯晶体在电子无耗散输运、自旋流产生、高性能热电、光电器件、拓扑量子计算等方面都具有重要的潜在应用价值.本文针对最近几年来锡烯的研究进展进行简要的综述.首先简单描述为什么锡烯晶体具有特殊的物理特性,然后介绍锡烯理论研究的进展以及最近利用分子束外延技术在锡烯晶体薄膜制备方法取得的突破,最后对今后可能的实验研究方向和内容进行了展望.
Inspired by the successfully experimental realization of graphene, other ultrathin materials consisting of group-IV elements Si, Ge and Sn have been attracted plenty of interests due to their unprecedented electronic properties. Among them, two-dimensional low-buckled Sn-based stanene and its derivatives present novel quantum properties due to its large spin-orbital coupling, such as a quantum spin Hall insulating behaviour with a very large band gap, and the capability to support enhanced thermoelectric performance, topological superconductivity and the near-room-temperature quantum anomalous Hall effect and so on. Therefore, stanene shows the great application potentials in the dissipationless electric conduction at room temperature, high performance thermoelectricity, spintronics and topological quantum computation. This review will briefly introduce the recent progress in the study of stanene both in theory and in experiment. Firstly, we will discuss the main motivation on study of the stanene. Tin（Sn） is a heavy element and stanene has the low-buckled honeycomb-like crystal structure, which makes its spin-orbital coupling strong enough to realize a quantum spin Hall state with a large energy gap of about 0.1 eV. The large bulk gap makes stanene the excellent candidate to explore the topological quantum properties of a quantum spin Hall insulator above the cryogenic temperature. Secondly, we will briefly introduce the theoretical calculations or predictions of the crystal and electronic structures of stanene. First-principle calculations show that the honeycomb-like low-buckled crystal structure of two-dimensional stanene is stable and could be realized experimentally in principle. Due to the sp^3 orbitals in stanene, it has dangling bonds that can be modified by surface decoration. Long range ferromagnetic order, topological superconductivity and largely enhanced bulk energy gap（up to ~ 0.3 eV） can be achieved by proper surface decoration theoretically. Topological transition can also induced by hydr
作者
钱冬
贾金锋
QIAN Dong JIA JinFeng(Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, Chin)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2016年第30期3252-3257,共6页
Chinese Science Bulletin
关键词
锡烯
大能隙
量子自旋霍尔效应绝缘体
分子束外延
stanene
large band gap
quantum-spin-Hall-effect insulator
molecular beam epitaxy
