凝聚态物理
各向异性
材料科学
色散(光学)
电子
电子能带结构
石墨烯
倾斜(摄像机)
Crystal(编程语言)
费米能量
光学
物理
纳米技术
几何学
量子力学
计算机科学
程序设计语言
数学
作者
Qisheng Wang,Can Yeşilyurt,Fucai Liu,Zhuo Bin Siu,Kaiming Cai,Dushyant Kumar,Zhonghua Lu,M. B. A. Jalil,Hyunsoo Yang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2019-03-12
卷期号:19 (4): 2647-2652
被引量:22
标识
DOI:10.1021/acs.nanolett.9b00513
摘要
Band structures are vital in determining the electronic properties of materials. Recently, the two-dimensional (2D) semimetallic transition metal tellurides (WTe2 and MoTe2) have sparked broad research interest because of their elliptical or open Fermi surface, making distinct from the conventional 2D materials. In this study, we demonstrate a centrosymmetric photothermoelectric voltage distribution in WTe2 nanoflakes, which has not been observed in common 2D materials such as graphene and MoS2. Our theoretical model shows the anomalous photothermoelectric effect arises from an anisotropic energy dispersion and micrometer-scale hot carrier diffusion length of WTe2. Further, our results are more consistent with the anisotropic tilt direction of energy dispersion being aligned to the b-axis rather than the a-axis of the WTe2 crystal, which is consistent with the previous first-principle calculations as well as magneto-transport experiments. Our work shows the photothermoelectric current is strongly confined to the anisotropic direction of the energy dispersion in WTe2, which opens an avenue for interesting electro-optic applications such as electron beam collimation and electron lenses.
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