Environment-controlled Floquet-state paramagnetism

We study the response of ideal spin systems which are interacting with both a strong oscillating magnetic field, and a thermal environment, to a weak probing magnetic field. We demonstrate that even the sign of the resulting mean magnetization depends on the amplitude of the driving field and that i...

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Bibliographic Details
Published inPhysical review research Vol. 2; no. 2; p. 023293
Main Authors Diermann, Onno R., Schmidt, Heinz-Jürgen, Schnack, Jürgen, Holthaus, Martin
Format Journal Article
LanguageEnglish
Published American Physical Society 05.06.2020
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Summary:We study the response of ideal spin systems which are interacting with both a strong oscillating magnetic field, and a thermal environment, to a weak probing magnetic field. We demonstrate that even the sign of the resulting mean magnetization depends on the amplitude of the driving field and that its absolute value can be significantly larger than the equilibrium magnetization in the absence of time-periodic forcing. Since the underlying Floquet-state occupation probabilities are determined by the precise form of the system-bath coupling, future measurements of such effects have the potential to establish a particularly innovative line of research, providing information on nonequilibrium thermodynamics and giving access to quantities which usually remain hidden when probing equilibrium systems.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.2.023293