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arXiv 1306.5515cond-mat.quant-gas
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二维光晶格中相互作用的自旋1玻色子

Interacting spin-1 bosons in a two-dimensional optical lattice

L. de Forges de Parny, F. Hébert, V. G. Rousseau, G. G. Batrouni

摘要:

利用量子蒙特卡罗(QMC)方法研究了正方形光晶格中自旋1玻色子的基态性质。相图的特征在于粒子的流动性(莫特绝缘或超流相)和它们的磁性。对于铁磁在位相互作用,整个相图是铁磁的,莫特绝缘体-超流相变是二级的。对于反铁磁的现场相互作用,发现在奇数莫特叶和超流相的自旋π阶。此外,超流-绝缘体相变是一阶或二阶的,取决于Mott中的密度是偶数还是奇数。甚至莫特叶内,我们观察到一个单到双跃迁的相互作用的某些值。这种转变似乎是一阶的。

英文摘要:

We study, using quantum Monte Carlo (QMC) simulations, the ground state properties of spin-1 bosons trapped in a square optical lattice. The phase diagram is characterized by the mobility of the particles (Mott insulating or superfluid phase) and by their magnetic properties. For ferromagnetic on-site interactions, the whole phase diagram is ferromagnetic and the Mott insulators-superfluid phase transitions are second order. For antiferromagnetic on-site interactions, spin nematic order is found in the odd Mott lobes and in the superfluid phase. Furthermore, the superfluid-insulator phase transition is first or second order depending on whether the density in the Mott is even or odd. Inside the even Mott lobes, we observe a singlet-to-nematic transition for certain values of the interactions. This transition appears to be first order.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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