Xia Yipu, Wang Bo, Zhang Junqiu, Jin Yuanjun, Tian Hao, Ho Wingkin, Xu Hu, Jin Chuanhong, Xie Maohai
Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong.
State Key Laboratory of Silicon Materials, School of Materials and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China.
Nano Lett. 2020 Mar 11;20(3):2094-2099. doi: 10.1021/acs.nanolett.0c00090. Epub 2020 Mar 2.
Confining interacting particles in one-dimension (1D) changes the electronic behavior of the system fundamentally, which has been studied extensively in the past. Examples of 1D metallic systems include carbon nanotubes, quasi-1D organic conductors, metal chains, and domain boundary defects in monolayer thick transition-metal dichalcogenides such as MoSe. Here single and bundles of MoSe nanowires were fabricated through annealing a MoSe monolayer grown by molecular-beam epitaxy on graphene. Conversion from two-dimensional (2D) MoSe film to 1D MoSe nanowire is reversible. MoSe nanowires form preferentially at the Se-terminated zigzag edges of MoSe and stitch to it via two distinct atomic configurations. The MoSe wire is metallic and its length is tunable, which represents one of few 1D systems that exhibit properties pertinent to quantum confined Tomonaga-Luttinger liquid, as evidenced by scanning tunneling microscopic and spectroscopic studies.
将相互作用的粒子限制在一维（1D）中会从根本上改变系统的电子行为，过去对此进行了广泛研究。一维金属系统的例子包括碳纳米管、准一维有机导体、金属链以及单层厚过渡金属二卤化物（如MoSe）中的畴界缺陷。在此，通过对在石墨烯上通过分子束外延生长的MoSe单层进行退火，制备了单根和束状的MoSe纳米线。从二维（2D）MoSe薄膜到一维MoSe纳米线的转变是可逆的。MoSe纳米线优先在MoSe的Se端锯齿边缘形成，并通过两种不同的原子构型与之相连。MoSe线是金属性的，其长度是可调的，这代表了少数几个展现出与量子限制的汤川-卢廷格液体相关性质的一维系统之一，扫描隧道显微镜和光谱研究证明了这一点。
