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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 Nirwan¹, Ivana Vasic^1,2, Alex Petrescu^3,4, Karyn Le Hur⁴, and Walter Hofstetter¹ — ¹Institut für Theoretische Physik, Frankfurt, Germany — ²Institute of Physics Belgrade, Belgrade, Serbia — ³Department of Physics, Yale, USA — ⁴Centre 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