arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.13677cond-mat.str-elhep-thmath-phmath.MPquant-ph
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从单个波函数提取多体Chern数

Extraction of many-body Chern number from a single wave function

Hossein Dehghani, Ze-Pei Cian, Mohammad Hafezi, Maissam Barkeshli

摘要:

整数和分数量子霍尔态的量子化霍尔电导率与拓扑不变量--多体陈数直接相关。传统的计算相互作用系统中的这个不变量需要一族由扭转角参数化的多体波函数来计算Berry曲率。在本文中,我们演示了如何提取陈数给定一个单一的多体波函数,不知道的哈密顿量。对于BTH状态,我们的方法需要一个额外的整数不变量作为输入:$2π$通量量子的数量,$s$,必须插入以获得拓扑平凡的激发。正如我们所讨论的,$s$原则上可以从环面上基态波函数的简并集得到,而不需要知道哈密顿量。我们进行了广泛的数值模拟,涉及IQH和CNOH状态,以验证这些方法。

英文摘要:

The quantized Hall conductivity of integer and fractional quantum Hall (IQH and FQH) states is directly related to a topological invariant, the many-body Chern number. The conventional calculation of this invariant in interacting systems requires a family of many-body wave functions parameterized by twist angles in order to calculate the Berry curvature. In this paper, we demonstrate how to extract the Chern number given a single many-body wave function, without knowledge of the Hamiltonian. For FQH states, our method requires one additional integer invariant as input: the number of $2π$ flux quanta, $s$, that must be inserted to obtain a topologically trivial excitation. As we discuss, $s$ can be obtained in principle from the degenerate set of ground state wave functions on the torus, without knowledge of the Hamiltonian. We perform extensive numerical simulations involving IQH and FQH states to validate these methods.

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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