Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 73: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 2
TT 73.6: Talk
Thursday, March 23, 2017, 16:15–16:30, HSZ 304
Multiple particle-hole pair creation in the Fermi-Hubbard model — Nicolai ten Brinke, Manuel Ligges, Uwe Bovensiepen, Ralf Schützhold, and •Friedemann Queisser — Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße, Duisburg 47048, Germany
We study the Fermi-Hubbard model in the strongly correlated Mott phase under the influence of a harmonically oscillating hopping rate J(t) = J0 + △ J cos(ω t) [1]. Apart from the well-known fundamental resonance where the frequency ω of this oscillation equals (or a little exceeds) the Mott gap, we also find higher-order resonances where multiple particle-hole pairs are created when ω is near an integer multiple of the gap. These findings should be relevant for experimental realizations such as ultra-cold fermionic atoms in optical lattices or pump-probe experiments using laser pulses incident on correlated electrons in solid state materials.
[1] N. ten Brinke, M. Ligges, U. Bovensiepen and R. Schützhold, arXiv:1602.00871