Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143310
Title: Spatially dispersive circular photogalvanic effect in a Weyl semimetal
Authors: Ji, Zhurun
Liu, Gerui
Addison, Zachariah
Liu, Wenjing
Yu, Peng
Gao, Heng
Liu, Zheng
Rappe, Andrew M.
Kane, Charles L.
Mele, Eugene J.
Agarwal, Ritesh
Keywords: Science::Physics
Issue Date: 2019
Source: Ji, Z., Liu, G., Addison, Z., Liu, W., Yu, P., Gao, H., ... Agarwal, R. (2019). Spatially dispersive circular photogalvanic effect in a Weyl semimetal. Nature Materials, 18, 955-962. doi:10.1038/s41563-019-0421-5
Project: MOE2016-T2-2-153
NRF-RF2013-08
Journal: Nature Materials
Abstract: Weyl semimetals (WSMs) are gapless topological states of matter with broken inversion and/or time reversal symmetry. WSMs can support a circulating photocurrent when illuminated by circularly polarized light at normal incidence. Here, we report a spatially dispersive circular photogalvanic effect (s-CPGE) in a WSM that occurs with a spatially varying beam profile. Our analysis shows that the s-CPGE is controlled by a symmetry selection rule combined with asymmetric carrier excitation and relaxation dynamics. By evaluating the s-CPGE for a minimal model of a WSM, a frequency-dependent scaling behaviour of the photocurrent is obtained. Wavelength-dependent measurements from the visible to mid-infrared range show evidence of Berry curvature singularities and band inversion in the s-CPGE response. We present the s-CPGE as a promising spectroscopic probe for topological band properties, with the potential for controlling photoresponse by patterning optical fields on topological materials to store, manipulate and transmit information.
URI: https://hdl.handle.net/10356/143310
ISSN: 1476-1122
DOI: 10.1038/s41563-019-0421-5
Rights: © 2019 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. This paper was published in Nature Materials and is made available with permission of Macmillan Publishers Limited, part of Springer Nature.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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