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Sigmund Kohler |
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Graphene under bichromatic driving: Commensurability and spatio-temporal symmetriesSigmund Kohler and Tobias StauberEur. Phys. J. B 93, 24 (2020) We study the non-linear current response of a Dirac model that is coupled to two time-periodic electro-magnetic fields with different frequencies. We distinguish between incommensurable and commensurable frequencies, the latter characterized by their ratio p/q with co-prime integers p and q. Coupling the (effective) two-level system to a dissipative bath ensures a well-defined long-time solution for the reduced density operator and, thus, the current. We then analyze the spatio-temporal symmetries that force certain current components to vanish and close with conclusions for directed average currents. arXiv:1910.09237 |
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last modified: 11.5.2026 by
Sigmund Kohler