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DOE OSTI · 1865229

Floquet control of indirect exchange interaction in periodically driven two-dimensional electron systems

Asmar, Mahmoud M.·Tse, Wang-Kong
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Abstract

We present a theory for the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction mediated by a two-dimensional (2D) electron system subjected to periodic driving. This is demonstrated for a 2D metal with two ferromagnetic chains deposited in parallel. Our calculations reveal new non-analytic features in the time-averaged spin susceptibility. For weak light–matter coupling, the RKKY interaction shows oscillations with a period tunable by the light amplitude and frequency. For stronger light–matter coupling, the interaction becomes non-oscillatory and remains purely ferromagnetic. Our findings open a path forward for realizing dynamic control of the indirect exchange interaction in 2D magnetic structures.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYFloquet systemsRKKY couplingindirect exchange interactionlight-matter couplingperiodic driving

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Asmar, Mahmoud M., Tse, Wang-Kong. 2021-12-16. Floquet control of indirect exchange interaction in periodically driven two-dimensional electron systems. https://doi.org/10.1088/1367-2630%2Fac3efe

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