arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.02091hep-thcond-mat.dis-nncond-mat.stat-mechquant-ph
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部分对称超对称多体系统:可积性、局部化和置乱

Supersymmetric Many-Body Systems from Partial Symmetries: Integrability, Localization and Scrambling

Pramod Padmanabhan, Soo-Jong Rey, Daniel Teixeira, Diego Trancanelli

摘要:

部分对称性由称为对称逆半群的广义群结构描述。我们使用这些结构所产生的代数来实现(0+1)维的超对称性,并在链上建立多体量子系统。这种构造包括将适当的超荷与链位点相关联,类似于自旋链中所做的。对于足够简单的超荷选择,我们表明,由此产生的状态有一个有限的非零威滕指数,这是不变的扰动下,因此定义超对称相的指数保护的物质。我们得到的哈密顿量是可积的,并且显示出包含乘积态和纠缠态的谱。通过引入无序和研究超时有序量子点(OTOC),我们发现这些系统处于多体定域相,没有热化。最后,我们重新制定了一个定理的增长有关的第二Renyi熵的OTOC的热状态的部分对称性。

英文摘要:

Partial symmetries are described by generalized group structures known as symmetric inverse semigroups. We use the algebras arising from these structures to realize supersymmetry in (0+1) dimensions and to build many-body quantum systems on a chain. This construction consists in associating appropriate supercharges to chain sites, in analogy to what is done in spin chains. For simple enough choices of supercharges, we show that the resulting states have a finite non-zero Witten index, which is invariant under perturbations, therefore defining supersymmetric phases of matter protected by the index. The Hamiltonians we obtain are integrable and display a spectrum containing both product and entangled states. By introducing disorder and studying the out-of-time-ordered correlators (OTOC), we find that these systems are in the many-body localized phase and do not thermalize. Finally, we reformulate a theorem relating the growth of the second Renyi entropy to the OTOC on a thermal state in terms of partial symmetries.

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