Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum gases: Lattices II

Q 57.7: Vortrag

Freitag, 21. März 2014, 12:00–12:15, UDL HS2002

String order and correlated phases with periodically modulated interactions — •Sebastian Greschner1, Luis Santos1, and Dario Poletti21Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, DE-30167 Hannover, Germany — 2Engineering Product Development, Singapore University of Technology and Design, 20 Dover Drive, 138682 Singapore

The periodic modulation of certain parameters in optical lattice experiments opens interesting possibilities for the control and engineering of lattice gases. Periodically modulated interactions result in a non-linear hopping rate depending on the occupation differences at neighbouring sites [1]. In this way some type of correlated-hopping models [2] as well as dynamical synthetic gauge fields [3] can be engineered. We show how the combined periodic modulation of optical lattices and interactions may be used to realize a very broad class of correlated-hopping Hubbard models for ultracold fermions and bosons. We study the rich physics of this scenario, including pair-superfluidity, dimerized phases as well as exotic Mott-insulator states with a non-vanishing string-order. We also address different aspects of the experimental preparation, stability and detection.

[1] A. Rapp, et al. Phys. Rev. Lett. 109, 203005 (2012).

[2] M. Di Liberto, et al. arXiv:1310.7959 (2013).

[3] S. Greschner, et al. arXiv:1311.3150 (2013).

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