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arXiv 1210.8143cond-mat.str-elcond-mat.mes-hall
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分数阶量子霍尔系统的自旋单态Gaffnian波函数

Spin-singlet Gaffnian wave function for fractional quantum Hall systems

Simon C. Davenport, Eddy Ardonne, Nicolas Regnault, Steven H. Simon

摘要:

我们详细描述了一个波函数可以想象的分数量子霍尔系统的自旋或等效的自由度。这个波函数结合了两个先前提出的量子霍尔波函数的性质,即非阿贝尔自旋单态和非酉加夫尼波函数。这是自旋极化加夫尼的自旋单态推广,我们称之为“自旋单态加夫尼”(SSG)。在本文中,我们提出的证据表明,SSG对应于基态的某个本地的哈密顿量,我们明确构建,而且,进一步地,我们提供了一个相对简单的解析表达式的独特的基态波函数,我们定义为零能量本征态的本地哈密顿量。此外,我们已经确定了一定的非幺正,合理的共形场论,它提供了一个基本的描述SSG,我们因此得出结论,SSG是ungapped在热力学极限。为了验证我们的结构,我们实现了两个最近提出的分数量子霍尔试验态的分析技术:“自旋缀饰压缩算法”和“广义泡利原理”。

英文摘要:

We characterize in detail a wave function conceivable in fractional quantum Hall systems where a spin or equivalent degree of freedom is present. This wave function combines the properties of two previously proposed quantum Hall wave functions, namely the non-Abelian spin-singlet state and the nonunitary Gaffnian wave function. This is a spin-singlet generalization of the spin-polarized Gaffnian, which we call the "spin-singlet Gaffnian" (SSG). In this paper we present evidence demonstrating that the SSG corresponds to the ground state of a certain local Hamiltonian, which we explicitly construct, and, further, we provide a relatively simple analytic expression for the unique ground-state wave functions, which we define as the zero energy eigenstates of that local Hamiltonian. In addition, we have determined a certain nonunitary, rational conformal field theory which provides an underlying description of the SSG and we thus conclude that the SSG is ungapped in the thermodynamic limit. In order to verify our construction, we implement two recently proposed techniques for the analysis of fractional quantum Hall trial states: The "spin dressed squeezing algorithm", and the "generalized Pauli principle".

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