Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Gases: Fermions III

Q 68.8: Vortrag

Freitag, 4. März 2016, 16:15–16:30, e001

Multiple particle-hole pair creation in the Fermi-Hubbard model by a pump laser — •Nicolai ten Brinke and Ralf Schützhold — Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße 1, D-47057 Duisburg, Germany

We study the Fermi-Hubbard model in the strongly correlated Mott regime under the influence of a harmonically oscillating electric field created by a pump laser. Using a Peierls transformation, the pump field can be represented as an effective, oscillating hopping rate in terms of the Fermi-Hubbard Hamiltonian. As the oscillation leads to a reduction in the effective time-averaged hopping rate, a sudden switch of the pump laser is analogous to a quantum quench in the lattice parameters. Apart from that, particle-hole pairs can be created via the oscillating components of the effective hopping rate, when the pump frequency is in resonance with the Mott gap. Further, it should be possible to create multiple particle-hole pairs if the pump frequency is an integer multiple of the Mott gap. These findings should be relevant for pump-probe experiments.