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Q: Fachverband Quantenoptik und Photonik
Q 15: Quantengase (Gitter I)
Q 15.4: Talk
Tuesday, March 11, 2008, 14:45–15:00, 1C
Phase Diagram of Spin-1 Bosons in Optical Lattice at Non-Zero Temperature — •Matthias Ohliger1 and Axel Pelster2 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fachbereich Physik, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany
We extend previous zero-temperature mean-field studies [1,2] for the location of the superfluid-Mott insulator transition of spin-1 bosons in an optical lattice to finite temperatures. We find that the phase boundary changes continuously with the magnetization of the system and that a complete magnetization reproduces the phase diagram of spin-0 bosons [3,4]. For an antiferromagnetic interaction, however, the zero-temperature limit of our phase diagram deviates significantly from the zero-temperature mean-field studies [1,2], where a degenerate perturbation theory is applied for an odd number of bosons per site.
[1] S. Tsuchiya, S. Kurihara, and T. Kimura, Phys. Rev. A 70, 043628 (2004)
[2] T. Kimura, S. Tsuchiya, M. Yamashita, and S. Kurihara, J. Phys. Soc. Japan 75, 074601 (2006)
[3] P. Buonsante and A. Vezzani, Phys. Rev. A 70, 033608 (2004).
[4] K.V. Krutitsky, A. Pelster, and R. Graham, New J. Phys. 8, 187 (2006).