First-Order Phase Transition and Anomalous Hysteresis of Binary Bose Mixtures in an Optical Lattice |
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Authors: | Daisuke Yamamoto Takeshi Ozaki Carlos A. R. Sá de Melo Ippei Danshita |
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Affiliation: | 1. Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama, 351-0198, Japan 2. Faculty of Business Administration and Information, Tokyo University of Science, Suwa, Chino, Nagano, 391-0292, Japan 3. School of Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA 4. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502, Japan 5. Computational Condensed Matter Physics Laboratory, RIKEN, Wako, Saitama, 351-0198, Japan
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Abstract: | We study a first-order phase transition between superfluid and Mott insulator phases in binary Bose mixtures loaded into a hypercubic optical lattice. The system is described by a two-component Bose-Hubbard model. Considering the difference between the two kinds of bosons in the intra-component interaction strength, we discuss the metastability of the system and the hysteresis associated with the first-order superfluid-Mott insulator transition. It is found that the sweeping of hopping amplitude induces a conventional hysteresis-loop behavior. We also find an anomalous hysteresis behavior when the chemical potential is varied. In the anomalous hysteresis, the phase transition occurs in a unidirectional way and a hysteresis loop does not form. |
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