Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators

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Details zur Publikation

Autorinnen und Autoren: Barbeau MMS, Eckstein M, Katsnelson M, Mentink JH
Zeitschrift: SciPost Physics
Jahr der Veröffentlichung: 2019
Band: 6
Heftnummer: 3
ISSN: 2542-4653


Abstract

In order to have a better understanding of ultrafast electrical control of exchange interactions in multi-orbital systems, we study a two-orbital Hubbard model at half filling under the action of a time-periodic electric field. Using suitable projection operators and a generalized time-dependent canonical transformation, we derive an effective Hamiltonian which describes two different regimes. First, for a wide range of non-resonant frequencies, we find a change of the bilinear Heisenberg exchange J(ex) that is analogous to the single-orbital case. Moreover we demonstrate that also the additional biquadratic exchange interaction B-ex can be enhanced, reduced and even change sign depending on the electric field. Second, for special driving frequencies, we demonstrate a novel spin-charge coupling phenomenon enabling coherent transfer between spin and charge degrees of freedom of doubly ionized states. These results are confirmed by an exact time-evolution of the full two-orbital Mott-Hubbard Hamiltonian.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Eckstein, Martin Prof. Dr.
Lehrstuhl für Theoretische Festkörperphysik


Einrichtungen weiterer Autorinnen und Autoren

Radboud University Nijmegen


Zitierweisen

APA:
Barbeau, M.M.S., Eckstein, M., Katsnelson, M., & Mentink, J.H. (2019). Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators. SciPost Physics, 6(3). https://dx.doi.org/10.21468/SciPostPhys.6.3.027

MLA:
Barbeau, Marion M. S., et al. "Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators." SciPost Physics 6.3 (2019).

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Zuletzt aktualisiert 2019-09-04 um 19:08