4.6 Article

Giant anisotropic photocurrent modulated by strain in Weyl semimetal Td-MoTe2

期刊

OPTICS LETTERS
卷 47, 期 4, 页码 906-909

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OPTICAL SOC AMER
DOI: 10.1364/OL.448086

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  1. National Natural Science Foundation of China [11574067]

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We studied the effect of strain on the Td-MoTe2 heterojunction and found that the strain-induced photocurrent exhibits anisotropy depending on the strain direction. The transport properties and magnitude of the photocurrent in the MoTe2-based device can be effectively modulated by adjusting the strength and direction of the strain.
We built a Cu-MoTe2-Cu device model and used first-principles density functional theory to study the transport properties of the Td-MoTe2 heterojunction. We obtained the effect of strain on the energy band structure of the bulk Td-MoTe2, the transport properties, and photocurrent of the Cu-MoTe2-Cu device. The strain-induced photocurrent shows an anisotropy that reflects the modulation of the energy bands, including the Weyl point, by strain. The photo-current can be suppressed to almost zero when the strain is applied along the vacuum direction. In contrast, the photo-current can be significantly increased when the strain is applied along the transport direction. The transport properties and magnitude of the photocurrent in the MoTe2-based device can be effectively modulated by adjusting the strength and direction of the strain. (C) 2022 Optica Publishing Group

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