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Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Tokyo (Japan). The Inst. of Solid State Physics; DOE/OSTI
  2. Univ. of Tokyo (Japan). The Inst. of Solid State Physics
  3. Univ. of Tokyo (Japan). The Inst. of Solid State Physics; Japan Science and Technology Agency, Kawaguchi (Japan). CREST
  4. Johns Hopkins Univ., Baltimore, MD (United States). The Inst. of Quantum Matter. Dept. of Physics and Astronomy
  5. Univ. of Tokyo (Japan). The Inst. of Solid State Physics; Japan Science and Technology Agency, Kawaguchi (Japan). CREST; Johns Hopkins Univ., Baltimore, MD (United States). The Inst. of Quantum Matter. Dept. of Physics and Astronomy; Univ. of Tokyo (Japan). Dept. of Physics
  6. Univ. of Tokyo (Japan). The Inst. of Solid State Physics; Japan Science and Technology Agency, Kawaguchi (Japan). PRESTO
Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however, their smaller responses to external field inhibit device application. Recently the noncollinear antiferromagnet Mn3Sn, a Weyl semimetal candidate, was reported to show large anomalous Hall effect (AHE) at room temperature comparable to ferromagnets. Dynamical aspect of such large responses is an important issue to be clarified for future THz data processing. Here the THz anomalous Hall conductivity in Mn3Sn thin films is investigated by polarization-resolved spectroscopy. Large anomalous Hall conductivity Re σxyð Þ ω 20 Ω1cm1 at THz frequencies is clearly observed as polarization rotation. A peculiar temperature dependence corresponding to the breaking/recovery of symmetry in the spin texture is also discussed. Observation of the THz AHE at room temperature demonstrates the ultrafast readout for the antiferromagnetic spintronics using Mn3Sn, and will also open new avenue for studying nonequilibrium dynamics in Weyl antiferromagnets.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0019331
OSTI ID:
1629762
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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