范德瓦尔斯力
拉曼光谱
凝聚态物理
磁电阻
化学
各向异性
电导
磁场
材料科学
物理
光学
分子
量子力学
有机化学
作者
Yuhang Du,Gang Qiu,Yixiu Wang,Mengwei Si,Xianfan Xu,Wenzhuo Wu,Peide D. Ye
出处
期刊:Nano Letters
[American Chemical Society]
日期:2017-06-02
卷期号:17 (6): 3965-3973
被引量:277
标识
DOI:10.1021/acs.nanolett.7b01717
摘要
Experimental demonstrations of one-dimensional (1D) van der Waals material tellurium (Te) have been presented by Raman spectroscopy under strain and magneto-transport. Raman spectroscopy measurements have been performed under strains along different principle axes. Pronounced strain response along the c-axis is observed due to the strong intrachain covalent bonds, while no strain response is obtained along the a-axis due to the weak interchain van der Waals interaction. Magneto-transport results further verify its anisotropic property, which results in dramatically distinct magneto-resistance behaviors in terms of three different magnetic field directions. Specifically, phase coherence length extracted from weak antilocalization effect, Lϕ ≈ T–0.5, claims its two-dimensional (2D) transport characteristics when an applied magnetic field is perpendicular to the thin film. In contrast, Lϕ ≈ T–0.33 is obtained from universal conductance fluctuations once the magnetic field is along the c-axis of Te, which indicates its nature of 1D transport along the helical atomic chains. Our studies, which are obtained on high quality single crystal Te thin film, appear to serve as strong evidence of its 1D van der Waals structure from experimental perspectives. It is the aim of this paper to address this special concept that differs from the previous well-studied 1D nanowires or 2D van der Waals materials.
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