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 theα,β,γ,δ,and chiral-α+δphases.Among them theγandαphases were found to be the most stable phases for monolayer and thicker layers,respectively.Here,we found two novel low-dimensional phases,namely theεandζphases.Theζphase is over 29 meV/Te more stable than the most stable monolayerγphase,and theεphase shows comparable stability with the most stable monolayerγphase.The energetic difference between theζandαphases reduces with respect to the increased layer thickness and vanishes at the four-layer(12-sublayer)thickness,while this thickness increases under change doping.Bothεandζphases are metallic chains and layers,respectively.Theζphase,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.
作者
Changlin Yan
Cong Wang
Linwei Zhou
Pengjie Guo
Kai Liu
Zhong-Yi Lu
Zhihai Cheng
Yang Chai
Anlian Pan
Wei Ji
严长林;王聪;周霖蔚;郭朋杰;刘凯;卢仲毅;程志海;柴扬;潘安练;季威(School of Physics and Electronics,Hunan University,Changsha 410082,China;Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices,Department of Physics,Renmin University of China,Beijing 100872,China;The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China;Key Laboratory for Micro-Nano Physics and Technology of Hunan Province,College of Materials Science and Engineering,Hunan University,Changsha 410082,China)
基金
Project supported by the Science Fund from the Ministry of Science and Technology(MOST)of China(Grant No.2018YFE0202700)
the National Natural Science Foundation of China(Grant Nos.11274380,91433103,11622437,61674171,11974422,and 61761166009)
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB30000000)
the Fundamental Research Funds for the Central Universities of China and the Research Funds of Renmin University of China(Grant No.16XNLQ01)
the Research Grant No.Council of Hong Kong,China(Grant No.N_PolyU540/17)
the Hong Kong Polytechnic University(Grant No.G-SB53).Cong Wang was supported by the Outstanding Innovative Talents Cultivation Funded Programs 2017 of Renmin University of China.
