Visualizing bulk and edge photocurrent flow in anisotropic Weyl
semimetals
- URL: http://arxiv.org/abs/2203.17176v2
- Date: Tue, 13 Dec 2022 18:48:28 GMT
- Title: Visualizing bulk and edge photocurrent flow in anisotropic Weyl
semimetals
- Authors: Yu-Xuan Wang, Xin-Yue Zhang, Chunhua Li, Xiaohan Yao, Ruihuan Duan,
Thomas K. M. Graham, Zheng Liu, Fazel Tafti, David Broido, Ying Ran, Brian B.
Zhou
- Abstract summary: We study the photocurrent flow inside type-II Weyl semimetals WTe2 and TaIrTe4 using high-sensitivity quantum magnetometry.
We elucidate an unknown mechanism for bulk photocurrent generation termed the anisotropic photothermoelectric effect (APTE)
Our results highlight an overlooked, but widely relevant source of current flow and inspire novel photodetectors using homogeneous materials with anisotropy.
- Score: 5.786199616690243
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Materials that rectify light into current in their bulk are desired for
optoelectronic applications. In inversion-breaking Weyl semimetals, bulk
photocurrents may arise due to nonlinear optical processes that are enhanced
near the Weyl nodes. However, the photoresponse of these materials is commonly
studied by scanning photocurrent microscopy (SPCM), which convolves the effects
of photocurrent generation and collection. Here, we directly image the
photocurrent flow inside the type-II Weyl semimetals WTe2 and TaIrTe4 using
high-sensitivity quantum magnetometry with nitrogen-vacancy center spins. We
elucidate an unknown mechanism for bulk photocurrent generation termed the
anisotropic photothermoelectric effect (APTE), where unequal thermopowers along
different crystal axes drive intricate circulations of photocurrent around the
photoexcitation. Using simultaneous SPCM and magnetic imaging at the sample's
interior and edges, we visualize how the APTE stimulates the long-range
photocurrent collected in our Weyl semimetal devices through the Shockley-Ramo
theorem. Our results highlight an overlooked, but widely relevant source of
current flow and inspire novel photodetectors using homogeneous materials with
anisotropy.
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