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Generation of DC, AC, and Second-Harmonic Spin Currents by Electromagnetic Fields in an Inversion-Asymmetric Antiferromagnet

Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
Condens. Matter 2019, 4(4), 92; https://doi.org/10.3390/condmat4040092
Received: 8 November 2019 / Revised: 30 November 2019 / Accepted: 7 December 2019 / Published: 11 December 2019
Manipulating spin currents in magnetic insulators is a key technology in spintronics. We theoretically study a simple inversion-asymmetric model of quantum antiferromagnets, where both the exchange interaction and the magnetic field are staggered. We calculate spin currents generated by external electric and magnetic fields by using a quantum master equation. We show that an ac electric field with amplitude E 0 leads, through exchange-interaction modulation, to the dc and second-order harmonic spin currents proportional to E 0 2 . We also show that dc and ac staggered magnetic fields B 0 generate the dc and ac spin currents proportional to B 0 , respectively. We elucidate the mechanism by an exactly solvable model, and thereby propose the ways of spin current manipulation by electromagnetic fields. View Full-Text
Keywords: spintronics; spin current; quantum spin system; light-matter interaction; nonlinear optics; quantum master equation; Jordan-Wigner transformation spintronics; spin current; quantum spin system; light-matter interaction; nonlinear optics; quantum master equation; Jordan-Wigner transformation
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Ikeda, T.N. Generation of DC, AC, and Second-Harmonic Spin Currents by Electromagnetic Fields in an Inversion-Asymmetric Antiferromagnet. Condens. Matter 2019, 4, 92.

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