Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Ultracold Atoms II

Q 57.6: Vortrag

Freitag, 10. März 2017, 15:45–16:00, P 104

Cavity-induced quantum phases of ultracold atoms in commensurate potentials — •Benjamin Bogner, Giovanna Morigi, and Heiko Rieger — Theoretical Physics Saarland University, 66123 Saarbrücken, Germany

We analyse the quantum phases of bosonic atoms, which are tightly confined by a one-dimensional optical lattice and interact with the long-range potential induced by the coupling with an optical resonator. Their dynamics is described by an extended Bose-Hubbard model, where the cavity field induces long-range density-density interactions in the form of the square of the even-odd site occupation balance. The interplay of this potential with nearest neighbor hopping and onsite repulsion is analyzed by means of quantum Monte-Carlo simulations. The phase diagram is determined as a function of the hopping amplitude, the chemical potential, and the strength of the long-range cavity interaction, rescaled by the onsite potential strength, displaying superfluid, supersolid, Mott insulator, and density-wave regions phases. A comparison is drawn with the phase diagram of the extended one-dimensional Bose-Hubbard-model with only nearest-neighbour interactions.