Please use this identifier to cite or link to this item: https://doi.org/10.1021/acs.nanolett.9b00513
Title: Anomalous Photothermoelectric Transport Due to Anisotropic Energy Dispersion in WTe2
Authors: WANG, QISHENG 
YESILYURT, CAN
LIU, FUCAI
SIU ZHUO BIN 
CAI, KAIMING 
KUMAR, DUSHYANT 
LIU, ZHENG
JALIL, MANSOOR BA 
YANG, HYUNSOO 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
2D materials
photothermoelectric effect
anisotropic energy dispersion
WTe2 crystal
electro-optic applications
VALLEY POLARIZATION
BLACK PHOSPHORUS
MOS2
SUPERCONDUCTIVITY
OPTOELECTRONICS
DENSITY
STATE
Issue Date: 1-Apr-2019
Publisher: AMER CHEMICAL SOC
Citation: WANG, QISHENG, YESILYURT, CAN, LIU, FUCAI, SIU ZHUO BIN, CAI, KAIMING, KUMAR, DUSHYANT, LIU, ZHENG, JALIL, MANSOOR BA, YANG, HYUNSOO (2019-04-01). Anomalous Photothermoelectric Transport Due to Anisotropic Energy Dispersion in WTe2. NANO LETTERS 19 (4) : 2647-2652. ScholarBank@NUS Repository. https://doi.org/10.1021/acs.nanolett.9b00513
Abstract: © 2019 American Chemical Society. Band structures are vital in determining the electronic properties of materials. Recently, the two-dimensional (2D) semimetallic transition metal tellurides (WTe 2 and MoTe 2 ) 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 WTe 2 nanoflakes, which has not been observed in common 2D materials such as graphene and MoS 2 . Our theoretical model shows the anomalous photothermoelectric effect arises from an anisotropic energy dispersion and micrometer-scale hot carrier diffusion length of WTe 2 . 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 WTe 2 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 WTe 2 , which opens an avenue for interesting electro-optic applications such as electron beam collimation and electron lenses.
Source Title: NANO LETTERS
URI: https://scholarbank.nus.edu.sg/handle/10635/155401
ISSN: 15306984
15306992
DOI: 10.1021/acs.nanolett.9b00513
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