# Heidelberg 2015 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 15: Poster: Quantum Optics and Photonics I

### Q 15.31: Poster

### Montag, 23. März 2015, 17:00–19:00, C/Foyer

**Superfluid Phases in the Presence of Artificial Gauge Fields** — •Rajbir Nirwan^{1}, Ivana Vasic^{1,2}, Alex Petrescu^{3,4}, Karyn Le Hur^{4}, and Walter Hofstetter^{1} — ^{1}Institut für Theoretische Physik, Frankfurt, Germany — ^{2}Institute of Physics Belgrade, Belgrade, Serbia — ^{3}Department of Physics, Yale, USA — ^{4}Centre de Physique Theorique, Ecole Polytechnique, France

In recent years several experiments have reported the realization of artificial gauge fields in systems of cold atoms in optical lattices. One of the latest advances has been the realization of the Haldane model [1,2]. Motivated by these achievements, we investigate the Haldane model for bosons in the weakly interacting regime using the Gross Pitaevskii- equation [3]. We study the ground state of the system and find two different superfluid phases. In the normal superfluid phase the ground state of the system is a Bose-Einstein condensate at zero quasi-momentum. However, for sufficiently strong next-nearest neighbor hopping we find a chiral superfluid phase, where the ground state of the system consists of two condensates formed at finite quasi-momentum. In both cases we calculate the pattern of local mass currents and density distributions.

[1] F. D. M. Haldane, Phys. Rev. Lett. 61, 2015 (1988)

[2] G. Jotzu, M. Messer, R. Desbuquois, M. Lebrat, T. Uehlinger, D. Greif, and T. Esslinger, Nature (London) 515, 237 (2014)

[3] I. Vasic, A. Petrescu, K. Le Hur, W. Hofstetter, arXiv: 1408.1411