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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum gases: Bosons, mixtures and spinor gases
Q 12.6: Vortrag
Montag, 17. März 2014, 15:15–15:30, UDL HS2002
Tuning Superfluid Phases of Spin-1 Bosons in Cubic Optical Lattice With Linear Zeeman Effect — •Mohamed Mobarak1 and Axel Pelster2 — 1Department of Physics, Freie Universität Berlin, Germany — 2Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany
We analyze theoretically a spinor Bose gas loaded into a three-dimensional cubic optical lattice. In order to account for different superfluid phases of spin-1 bosons in the presence of an external magnetic field, we follow Refs. [1,2] and work out a Ginzburg-Landau theory for the underlying spin-1 Bose-Hubbard model. In particular at zero temperature, we determine both the Mott and the superfluid phases for the competition between the anti-ferromagnetic interaction and the linear Zeeman effect within the validity range of the Ginzburg-Landau theory. Moreover, we find that the phase transition between the superfluid and Mott insulator phases is of second order and that the transitions between the respective superfluid phases for anti-ferromagnetic interaction can be both of first and second order [3,4].
[1] F.E.A. dos Santos and A. Pelster, Phys. Rev. A 79, 013614 (2009)
[2] B. Bradlyn, F.E.A. dos Santos, and A. Pelster, Phys. Rev. A 79, 013615 (2009)
[3] M. Mobarak and A. Pelster, Laser Phys. Lett. 10, 115501 (2013)
[4] M. Mobarak and A. Pelster, arXiv:1310.0600