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arXiv 1607.02302cond-mat.quant-gascond-mat.str-el
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具有三体相互作用的$S=1$ Bose-哈伯德模型的Mott波瓣

Mott lobes of the $S=1$ Bose-Hubbard model with three-body interactions

A. F. Hincapie-F, R. Franco, J. Silva-Valencia

摘要:

利用密度矩阵重整化群方法,研究了具有局域三体相互作用的一维$S=1$ Bose-哈伯德模型的基态,它可以是超流态,也可以是莫特绝缘体态.我们绘制了该模型的铁磁和反铁磁相互作用的相图。无论自旋相关耦合的符号是什么,Mott波瓣的面积都随着自旋相关耦合强度的增加而减小,这意味着在局域三体相互作用中,两体反铁磁链的奇偶不对称性是不存在的.对于反铁磁耦合,我们发现密度驱动一阶超流-莫特绝缘体跃迁的偶数和奇数瓣。通过铁磁耦合得到了铁磁莫特绝缘体和超流态,并观察到了“长程”有序的趋势。

英文摘要:

Using the density matrix renormalization group method, we studied the ground state of the one-dimensional $S=1$ Bose-Hubbard model with local three-body interactions, which can be a superfluid or a Mott insulator state. We drew the phase diagram of this model for both ferromagnetic and antiferromagnetic interaction. Regardless of the sign of the spin-dependent coupling, we obtained that the Mott lobes area decreases as the spin-dependent strength increases, which means that the even-odd asymmetry of the two-body antiferromagnetic chain is absent for local three-body interactions. For antiferromagnetic coupling, we found that the density drives first-order superfluid-Mott insulator transitions for even and odd lobes. Ferromagnetic Mott insulator and superfluid states were obtained with a ferromagnetic coupling, and a tendency to a "long-range" order was observed.

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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