Superfluid-mott insulator transition of spinor bose gases with external magnetic fields
Superfluid-mott insulator transition of spinor bose gases with external magnetic fields
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DOI：
10.1143/jpsj.72.1041
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发表时间：
2003-05
影响因子：
1.7
通讯作者：
N. Uesugi;M. Wadati
中科院分区：
文献类型：
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作者：
N. Uesugi;M. Wadati
本文研究了光晶格中自旋为1的玻色子系统的超流-莫特绝缘体（SF-MI）跃迁，特别是系统对外磁场的响应。利用平均场理论，我们得到了零温SF-MI相变的相图。对于反铁磁玻色子，莫特绝缘体区域是稳定的，当每个网站的粒子数是偶数。我们发现，只有改变外加磁场，才能实现SF-MI相变。另一方面，铁磁的情况下完美地恢复自旋冻结的情况下，这已经在实验中进行。
We study the superfluid–Mott insulator (SF–MI) transition of a spin-1 boson system in an optical lattice, especially the responce of the system to an external magnetic field. Using the mean field theory, we obtain the phase diagram of SF–MI transition at zero temperature. For antiferromagnetic bosons, the Mott insulator region is stabilized when the number of particles per site is even. We find that only by changing the external magnetic field, the SF–MI transition is realized. On the other hand, the ferromagnetic case perfectly recovers the spin frozen case, that is already performed in experiments.