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arXiv 1010.4837cond-mat.str-elcond-mat.mes-hall
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分数量子霍尔态的分解:新的对称性和近似

Decomposition of fractional quantum Hall states: New symmetries and approximations

Ronny Thomale, Benoit Estienne, Nicolas Regnault, B. Andrei Bernevig

摘要:

我们提供了一个新的对称结构的玻色子(费米子)分数量子霍尔态的单式(斯莱特)展开系数的详细描述,首先在参考文献1中得到,我们现在扩展到自旋单态。我们表明,Haldane-Rezayi自旋单态可以通过微分方程方法,我们猜想是通用的其他的BJAH模型状态,而无需精确对角化。参考文献1中的对称性规则以及我们对自旋单重态获得的对称性规则使我们能够建立近似的自旋单重态,这些自旋单重态与精确态的重叠越来越大(作为系统大小的函数)。我们表明,这些重叠达到统一的热力学极限,即使我们的近似省略了一半以上的希尔伯特空间。我们证明了乘积规则对任何可以写成仿费米子算符期望值的量子态都是有效的。

英文摘要:

We provide a detailed description of a new symmetry structure of the monomial (Slater) expansion coefficients of bosonic (fermionic) fractional quantum Hall states first obtained in Ref. 1, which we now extend to spin-singlet states. We show that the Haldane-Rezayi spin-singlet state can be obtained without exact diagonalization through a differential equation method that we conjecture to be generic to other FQH model states. The symmetry rules in Ref. 1 as well as the ones we obtain for the spin singlet states allow us to build approximations of FQH states that exhibit increasing overlap with the exact state (as a function of system size). We show that these overlaps reach unity in the thermodynamic limit even though our approximation omits more than half of the Hilbert space. We show that the product rule is valid for any FQH state which can be written as an expectation value of parafermionic operators.

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