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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 B. A.
Yang, Hyunsoo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Wang, Q., Yesilyurt, C., Liu, F., Siu, Z. B., Cai, K., Kumar, D., . . . Yang, H. (2019). Anomalous Photothermoelectric Transport Due to Anisotropic Energy Dispersion in WTe2. Nano Letters, 19(4), 2647–2652. doi:10.1021/acs.nanolett.9b00513
Journal: Nano letters
Abstract: 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.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.9b00513
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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