arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.00103cond-mat.str-elhep-th
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临界量子自旋链的普适信息

Universal information of critical quantum spin chains from wavefunction overlaps

Yijian Zou

摘要:

给定一个临界量子自旋链,我们展示了如何从波函数重叠中提取关于其量子临界点的普适信息。更具体地说,我们考虑了不同的边界条件,即周期性边界条件和开边界条件的自旋链哈密顿量的低能本征态之间的重叠。我们表明,这种重叠衰减多项式与系统的大小,其中的指数只取决于中心荷。此外,体到边界的算子乘积展开(OPE)系数可以从涉及激发态的重叠中提取。我们用伊辛模型和三态Potts模型来说明这个方案。

英文摘要:

Given a critical quantum spin chain, we show how universal information about its quantum critical point can be extracted from wavefunction overlaps. More specifically, we consider overlap between low-energy eigenstates of the spin chain Hamiltonian with different boundary conditions, namely periodic boundary conditions and open boundary conditions. We show that such overlaps decay polynomially with the system size, where the exponent only depends on the central charge. Furthermore, the bulk-to-boundary operator product expansion (OPE) coefficients can be extracted from the overlaps involving excited states. We illustrate the proposal with the Ising model and the three-state Potts model.

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