Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 69: Nonequilibrium Quantum Systems II (joint session TT/DY)

TT 69.7: Vortrag

Donnerstag, 21. März 2024, 11:00–11:15, H 3025

Transport resonances in systems with time periodic impurities — •Jan Mathis Giesen and Sebastian Eggert — Department of Physics and Research Center Optimas, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Periodically driven impurities in tight binding chains can lead to the complete breakdown of transport even at infinitesimal small driving amplitudes due to a Fano-like resonance [1]. We now go beyond the simple model to analyse effects of time-periodic impurities in general setups like electronic systems, magnons in thin ferromagnetic films, photonic waveguides and the scattering of cold atoms. More specifically we examine single particle transport resonances in models featuring long range coupling and generally more complicated band structures as well as multiple channels, modes or bands.
We extend the Floquet scattering ansatz using plane waves to include multiple modes and also apply a generalization in form of a Floquet-S-matrix scattering approach. We find that transport resonances are highly susceptible to changes in the band structure. Depending on the driving parameters and energy of incoming states new transport resonances can appear while others might become completely suppressed.

[1] S. A. Reyes et al.. New J. Phys. 19 (2017) 043029

Keywords: Floquet theory; one dimentional transport; scattering resonance; Fano-resonance; dynamic impurity