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arXiv 2203.09264quant-phcond-mat.str-el
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PXP模型中零能本征态的个数

Number of zero-energy eigenstates in the PXP model

Wouter Buijsman

摘要:

PXP模型是量子多体伤疤领域的典范。该模型具有许多零能量本征态,其系统尺寸呈指数级大。零能量本征态的数目的下限得到开放和周期性(零和$π$ -动量扇区)边界条件。这些边界被发现是紧的系统大小访问的数值精确对角化,并可以预期是紧的一般。除了以前的结果,单独的下界获得的空间反演对称和反演反对称对称部门。此外,推导改进了以前的推导,因为这些推导没有假设。

英文摘要:

The PXP model is paradigmatic in the field of quantum many-body scars. This model has a number of zero-energy eigenstates that is exponentially large in system size. Lower bounds on the number of zero-energy eigenstates are obtained for both open and periodic (zero and $π$-momentum sectors) boundary conditions. These bounds are found to be tight up to system sizes accessible by numerical exact diagonalization, and can be expected to be tight in general. In addition to previous results, separate lower bounds are obtained for the spatial inversion-symmetric and inversion-antisymmetric symmetry sectors. Furthermore, the derivations improve on previous ones as these are free of assumptions.

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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