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

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...

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Bibliographic Details
Published in:Physical review letters 2023-09, Vol.131 (9), p.096901-096901, Article 096901
Main Authors: Murotani, Yuta, Kanda, Natsuki, Fujimoto, Tomohiro, Matsuda, Takuya, Goyal, Manik, Yoshinobu, Jun, Kobayashi, Yohei, Oka, Takashi, Stemmer, Susanne, Matsunaga, Ryusuke
Format: Article
Language:English
Subjects:
Anomalous Hall effect
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Dirac semimetal
Floquet
Floquet systems
Geometric & topological phases
Optical-pump terahertz-probe spectroscopy
Photogalvanic effect
Schroedinger equation
Terahertz time-domain spectroscopy
Weyl semimetal
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.131.096901