Disentangling the Competing Mechanisms of Light-Induced Anomalous Hall Conductivity in Three-Dimensional Dirac Semimetal

Journal Article · 29 August 2023 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.131.096901 · OSTI ID:1997206

Murotani, Yuta  ^[1]; Kanda, Natsuki  ^[2]; Fujimoto, Tomohiro  ^[2]; Matsuda, Takuya  ^[2]; Goyal, Manik ^[3]; Yoshinobu, Jun  ^[2]; Kobayashi, Yohei  ^[2]; Oka, Takashi  ^[2]; Stemmer, Susanne  ^[3]; Matsunaga, Ryusuke  ^[2]

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1. University of Tokyo, Chiba (Japan); University of California, Santa Barbara
2. University of Tokyo, Chiba (Japan)
3. University of California, Santa Barbara, CA (United States)

We experimentally elucidate the origin of the anomalous Hall conductivity in a three-dimensional Dirac semimetal, Cd₃As₂, driven by circularly polarized light. Using time-resolved terahertz Faraday rotation spectroscopy, we determine the transient Hall conductivity spectrum with special attention to its sign. Our results clearly show the dominance of direct photocurrent generation assisted by the terahertz electric field. The contribution from the Floquet-Weyl nodes is found to be minor when the driving light is in resonance with interband transitions. Here, we develop a generally applicable classification of microscopic mechanisms of light-induced anomalous Hall conductivity.

• Research Organization: University of California, Santa Barbara, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1997206
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 131; ISSN 0031-9007
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English