Ground-state properties of the one-dimensional unconstrained pseudo-anyon Hubbard model

Ground-state properties of the one-dimensional unconstrained pseudo-anyon Hubbard model
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一维无约束伪任意子哈伯德模型的基态特性

DOI:
10.1103/physreva.95.053614
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发表时间:
2016-09
期刊:
影响因子:
2.9
通讯作者:
Zhang Yunbo
Zhang Yunbo
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang Wanzhou;Greschner Sebastian;Fan Ernv;Scott Tony C.;Zhang Yunbo

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研究了不存在三体硬核约束的一维晶格上的(伪)任意子Hubbard模型。特别地,对于大统计角$\theta\approx\pi$的赝费米子极限,我们观察到了大量奇异的性质,包括不同超流相之间的{一阶跃迁}和大填充的{二组分}部分成对相,而不需要额外的三体硬核约束。这导致超流{基态}的稳定化,以消除甚至小的吸引性现场相互作用。对于有限的统计角,我们研究了非常规的对称性破缺超流体在有限动量下的峰值,导致了单粒子关联函数的一个有趣的拍现象,我们展示了各种基态相位的一些特征,包括伪费米子极限下的部分配对相位的模拟,可以在一个朴素的平均场框架中再现。
We study the (pseudo-) anyon Hubbard model on a one-dimensional lattice without the presence of a three-body hardcore constraint. In particular, for the pseudo-fermion limit of a large statistical angle $\theta\approx\pi$, we observe a wealth of exotic properties including {a first order transition} between different superfluid phases and a {two-component} partially paired phase for large fillings without need of an additional three-body hardcore constraint.In this limit, we analyze the effect of an induced hardcore constraint, which leads to the stabilization of superfluid {ground states} for vanishing or even small attractive on-site interactions. For finite statistical angles, we study the unconventional broken-symmetry superfluid peaked at a finite momentum, resulting in an interesting beat phenomenon of single particle correlation functions.We show how some features of various ground state phases, including an analog of the partially paired phase in the pseudo-fermion limit, may be reproduced in a naive mean field frame.
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