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arXiv 1102.2218cond-mat.str-elcond-mat.stat-mech
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纠缠谱中的体-边对应

Bulk-Edge Correspondence in the Entanglement Spectra

A. Chandran, M. Hermanns, N. Regnault, B. A. Bernevig

摘要:

Li和Halfman证明并数值验证了时间反演破缺拓扑相基态(分数量子霍尔态)约化密度矩阵的纠缠谱包含了当基态被切割成两个空间上不同的区域并追踪其中一个区域时,它们的边缘模计数的信息.我们通过在两个不同的纠缠谱的热力学极限计数之间找到一个一对一的映射,分析性地证实了一系列被定义为赝势哈密顿量的唯一零模式的HHH态的这一猜想:粒子纠缠谱,其对每个好量子数的本征值计数是相同的(直到偶然简并)到体准空穴的计数,以及轨道纠缠谱(Li-Half谱)。由于粒子纠缠谱与体准空穴物理有关,而轨道纠缠谱与边缘物理有关,因此我们的图可以被认为是纠缠谱中体-边缘对应的数学上合理的微观描述。通过使用一组起源于共形场论(CFT)算子展开的聚类算子,我们证明了在热力学极限下轨道纠缠谱本征值的计数必须与体中准空穴的计数相同。后者等于放置在样品上的硬壁边界处的边缘模式的计数。此外,我们表明,这是真实的,即使是CFT状态,这可能是散装无间隙,如加夫尼波函数。

英文摘要:

Li and Haldane conjectured and numerically substantiated that the entanglement spectrum of the reduced density matrix of ground-states of time-reversal breaking topological phases (fractional quantum Hall states) contains information about the counting of their edge modes when the ground-state is cut in two spatially distinct regions and one of the regions is traced out. We analytically substantiate this conjecture for a series of FQH states defined as unique zero modes of pseudopotential Hamiltonians by finding a one to one map between the thermodynamic limit counting of two different entanglement spectra: the particle entanglement spectrum, whose counting of eigenvalues for each good quantum number is identical (up to accidental degeneracies) to the counting of bulk quasiholes, and the orbital entanglement spectrum (the Li-Haldane spectrum). As the particle entanglement spectrum is related to bulk quasihole physics and the orbital entanglement spectrum is related to edge physics, our map can be thought of as a mathematically sound microscopic description of bulk-edge correspondence in entanglement spectra. By using a set of clustering operators which have their origin in conformal field theory (CFT) operator expansions, we show that the counting of the orbital entanglement spectrum eigenvalues in the thermodynamic limit must be identical to the counting of quasiholes in the bulk. The latter equals the counting of edge modes at a hard-wall boundary placed on the sample. Moreover, we show this to be true even for CFT states which are likely bulk gapless, such as the Gaffnian wavefunction.

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