Terahertz conductivity of the magnetic Weyl semimetal Mn3Sn films

Cheng, Bing; Wang, Youcheng; Barbalas, D.; Higo, Tomoya; Nakatsuji, S.; Armitage, N. P.

doi:10.1063/1.5093414

Title: Terahertz conductivity of the magnetic Weyl semimetal Mn₃Sn films

Journal Article · 01 July 2019 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.5093414 · OSTI ID:1613181

Cheng, Bing ^[1];

^[2]; Barbalas, D. ^[2]; Higo, Tomoya ^[3];

^[4]; Armitage, N. P. ^[4]

Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Inst. for Quantum Matter (IQM); DOE/OSTI
Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Inst. for Quantum Matter (IQM)
Univ. of Tokyo (Japan)
Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Inst. for Quantum Matter (IQM); Univ. of Tokyo (Japan)

Mn₃Sn is a noncollinear antiferromagnet which displays a large anomalous Hall effect at room temperature. It is believed that the principal contribution to its anomalous Hall conductivity comes from the Berry curvature. Moreover, dc transport and photoemission experiments have confirmed that Mn₃Sn may be an example of a time-reversal symmetry breaking Weyl semimetal. Due to a small, but finite moment in the room temperature inverse triangular spin structure, which allows control of the Hall current with the external field, this material has garnered much interest for next generation memory devices and terahertz spintronics applications. In this work, we report a terahertz range study of randomly oriented Mn₃Sn thin films as a function of temperature. At low frequencies, we found that the optical conductivity can be well described by a single Drude oscillator. The plasma frequency is strongly suppressed in a temperature dependent fashion as one enters the 260 K helical phase. This may be associated with partial gapping of the Fermi surfaces, which comes from breaking translational symmetry along the c-axis. Finally, the scattering rate shows a quadratic temperature dependence below 200 K, highlighting the possible important role of interactions in this compound.

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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Inst. for Quantum Matter (IQM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (JSPS); Japan Science and Technology Agency (JST); Ministry of Education, Culture, Sports, Science and Technology (MEXT)

Grant/Contract Number:: SC0019331

OSTI ID:: 1613181

Alternate ID(s):: OSTI ID: 1825714; OSTI ID: 1825717; OSTI ID: 1530641

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 1 Vol. 115; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Orientation-dependent THz emission in non-collinear antiferromagnetic Mn ₃ Sn and Mn ₃ Sn-based heterostructures Zhou, Xiaofeng; Song, Bangju; Chen, Xianzhe Applied Physics Letters, Vol. 115, Issue 18 https://doi.org/10.1063/1.5121384	journal	October 2019

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