Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Cold Atomic Gases
TT 7.6: Vortrag
Montag, 7. März 2016, 11:45–12:00, H18
Beyond the Hubbard bands in strongly correlated lattice bosons — •Hugo U. R. Strand1, Martin Eckstein2, and Philipp Werner1 — 1University of Fribourg, 1700 Fribourg, Switzerland — 2Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, 22761 Hamburg, Germany
We study the dynamics of the Bose-Hubbard model in- and out-of-equilibrium, using the real-time extension [1] of bosonic dynamical mean-field theory (BDMFT) [2] in combination with a Nambu strong-coupling impurity solver. Building on our previous study on quench dynamics [1], yielding qualitative agreement with cold-atom experiments [3], we here focus on theoretically reproducing and understanding cold-atom spectroscopy experiments [4, 5] in the strong-coupling limit. We perform non-equilibrium BDMFT interaction-modulation spectroscopy calculations, qualitatively reproducing experimental results, and explain the observed spectra by analyzing the structure of the equilibrium single-particle spectral function and the interaction-susceptibility. In particular, we discuss the nontrivial temperature dependence of the second resonance [6].
[1] Strand, Eckstein, Werner, PRX 5, 011038 (2015)
[2] Anders, Werner, Troyer, Sigrist, Pollet, PRL 109, 206401 (2012)
[3] Greiner, Mandel, Hansch, Bloch, Nature 419, 51 (2002)
[4] Stöferle, Moritz, Schori, Köhl, Esslinger, PRL 92, 130403 (2004)
[5] Clément, Fabbri, Fallani, Fort, Inguscio, PRL 102, 155301 (2009)
[6] Strand, Eckstein, Werner, PRA 92, 063602 (2015)