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arXiv 1304.7553cond-mat.str-elcond-mat.quant-gas
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分数填充和积分填充下两组分玻色子的量子霍尔效应

Quantum Hall Effect of Two-Component Bosons at Fractional and Integral Fillings

Ying-Hai Wu, Jainendra K. Jain

摘要:

我们研究了在最低朗道能级下两分量玻色子的多种候选量子霍尔态的可行性。我们确定的相互作用,自旋单重不可压缩状态发生在填充因子$ν=2/3$,4/5和4/3,和自旋部分极化状态填充因子3/4和3/2,其中“自旋”作为一个通用的标签为两个组件。我们研究了16个玻色子系统的基态、激发态、边缘态和纠缠谱,并构造了显式的试探波函数来阐明其物理基础。复合费米子理论非常精确地描述了基态以及在$ν=2/3$、4/5和3/4处的激发,尽管它对$ν=3/2$态不太令人满意。对于$ν=4/3$,人们提出2体接触相互作用会出现“非阿贝尔自旋单重态”;我们发现这里的实际状态更有可能是填充$ν^*=4$时反向通量附着复合费米子的自旋单重态。我们还考虑不可压缩状态的积分填充因子$ν=1$和2。在$ν=1$的不可压缩状态被证明是很好地描述的部分子为基础的Jain自旋单重波函数,和在$ν=2$的不可压缩状态作为自旋单重态的反向通量附着复合费米子在$ν^*=2$。

英文摘要:

We investigate the feasibility of many candidate quantum Hall states for two-component bosons in the lowest Landau level. We identify interactions for which spin-singlet incompressible states occur at filling factors $ν=2/3$, 4/5 and 4/3, and spin-partially-polarized states at filling factors 3/4 and 3/2, where "spin" serves as a generic label for the two components. We study ground states, excitations, edge states and entanglement spectrum for systems with up to 16 bosons, and construct explicit trial wave functions to clarify the underlying physics. The composite fermion theory very accurately describes the ground states as well as excitations at $ν=2/3$, 4/5 and 3/4, although it is less satisfactory for the $ν=3/2$ state. For $ν=4/3$ a "non-Abelian spin-singlet" state has been proposed to occur for a 2-body contact interaction; we find that it is more likely that the actual state here is a spin-singlet state of reverse-flux-attached composite fermions at filling $ν^*=4$. We also consider incompressible states at integral filling factors $ν=1$ and 2. The incompressible state at $ν=1$ is shown to be well described by the parton-based Jain spin-singlet wave function, and the incompressible state at $ν=2$ as the spin-singlet state of reverse-flux-attached composite fermions at $ν^*=2$.

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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