Two ultra-stable novel allotropes of tellurium few-layers

• 作者: Anlian Pan Changlin Yan Cong Wang Kai Liu Linwei Zhou Pengjie Guo Wei Ji Yang Chai Zhihai Cheng Zhong-Yi Lu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 513-519
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/aba606

摘要

At least four two-or quasi-one-dimensional allotropes and a mixture of them were theoretically predicted or experimentally observed for low-dimensional Te,namely the α,β,γ,δ,and chiral-α + δ phases.Among them the γ and α phases were found to be the most stable phases for monolayer and thicker layers,respectively.Here,we found two novel low-dimensional phases,namely the ε and ζ phases.The ζ phase is over 29 meV/Te more stable than the most stable monolayer γ phase,and the ε phase shows comparable stability with the most stable monolayer γ phase.The energetic difference between the ζ and α phases reduces with respect to the increased layer thickness and vanishes at the four-layer (12-sublayer) thickness,while this thickness increases under change doping.Both e and ζ phases are metallic chains and layers,respectively.The ζ phase,with very strong interlayer coupling,shows quantum well states in its layer-dependent bandstructures.These results provide significantly insight into the understanding of polytypism in Te few-layers and may boost tremendous studies on properties of various few-layer phases.