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arXiv 1105.5907cond-mat.str-el
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分数量子Hall系统中轨道纠缠谱的分级结构

Hierarchical structure in the orbital entanglement spectrum in Fractional Quantum Hall systems

A. Sterdyniak, B. A. Bernevig, N. Regnault, F. D. M. Haldane

摘要:

研究了nu = 1/3分数量子霍尔效应基态在库仑作用下的轨道纠缠谱的非普适部分.光谱的非普适部分是Laughlin模型态OES中缺失的部分,其能级计数完全由其拓扑顺序决定。我们发现库仑相互作用基态的OES能级是以一种类似于具有Laughlin基态的模型赝势哈密顿量的激发能结构的层次结构来组织的。这些结构可以精确地模拟使用Jain的“复合费米子”准空穴准粒子激发波函数。为了强调纠缠谱和能谱之间的联系,我们还考虑了有限温度下模型赝势哈密顿量的量子光学效应。实验观察到的库仑OES和量子OES之间的良好匹配表明了纠缠带隙和真实能隙之间的关系。

英文摘要:

We investigate the non-universal part of the orbital entanglement spectrum (OES) of the nu = 1/3 fractional quantum Hall effect (FQH) ground-state with Coulomb interactions. The non-universal part of the spectrum is the part that is missing in the Laughlin model state OES whose level counting is completely determined by its topological order. We find that the OES levels of the Coulomb interaction ground-state are organized in a hierarchical structure that mimic the excitation-energy structure of the model pseudopotential Hamiltonian which has a Laughlin ground state. These structures can be accurately modeled using Jain's "composite fermion" quasihole-quasiparticle excitation wavefunctions. To emphasize the connection between the entanglement spectrum and the energy spectrum, we also consider the thermodynamical OES of the model pseudopotential Hamiltonian at finite temperature. The observed good match between the thermodynamical OES and the Coulomb OES suggests a relation between the entanglement gap and the true energy gap.

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