Abstract
We consider the high-frequency conductance of a two-state quantum system within non-equilibrium Green’s function formalism. Multiply connected configurations possessing Fano-Feshbach antiresonances in stationary transmission show a trivial behavior in the dynamical regime. Whereas the simply connected linear configuration, demonstrates an exceptional point in dynamics and destructive quantum interference for frequency equal the energy split between the eigenstates. This is manifestation of “synthetic dimension” introduced by the Floquet quasienergy spectrum.
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Acknowledgments
We are grateful to Dr. V.V. Kapaev for fruitful discussions.
Funding
N.M. Shubin acknowledges the support of the Russian Foundation for Basic Research (project no. 18-32-00453) and A.A. Gorbatsevich acknowledges the support of the Presidium of the Russian Academy of Sciences (Program of Fundamental Research).
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Gorbatsevich, A.A., Shubin, N.M. Destructive Quantum Interference and Exceptional Points in the High-Frequency Response of a Two-State System. Jetp Lett. 110, 618–623 (2019). https://doi.org/10.1134/S002136401921001X
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DOI: https://doi.org/10.1134/S002136401921001X