Many-body localization transition with correlated disorder

Many-body localization transition with correlated disorder
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具有相关障碍的多体定位转变

DOI:
10.1103/physrevb.106.144201
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Gopalakrishnan, Sarang
Gopalakrishnan, Sarang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shi, Zhengyan Darius;Khemani, Vedika;Vasseur, Romain;Gopalakrishnan, Sarang

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我们解决的多体局域化(MBL)相变在一维系统的空间相关的无序的关键属性。而不是从一个微观模型开始,我们分析了强随机性重整化群(RG)框架内的过渡。我们直接在RG中出现的标度变量的水平上引入无序,并考虑一个一般的空间相关性家族,参数化的无序耦合的波动有多强时,粗粒度的区域大小。对于不相关的随机性,这些波动的特征标度是;更一般地说,它们的标度是。我们讨论了正相关障碍()和非正相关障碍()。我们认为,在混乱的关系通常是无关的MBL过渡。此外,假设MBL转变是由最近发展的重整化群计划Morningstaret等人。[Phys. Rev. B 102,125134(2020)10.1103/PhysRevB.102.125134],我们认为,即使是正相关无序也会使临界理论保持不变,尽管它修改了多体局域相的某些性质。
We address the critical properties of the many-body localization (MBL) phase transition in one-dimensional systems subject to spatially correlated disorder. Rather than starting from a microscopic model, we analyze the transition within a strong-randomness renormalization group (RG) framework. We introduce disorder directly at the level of scaling variables appearing in the RG and consider a general family of spatial correlations, parameterized by how strong the fluctuations of the disordered couplings are when coarse-grained over a region of size. For uncorrelated randomness, the characteristic scale for these fluctuations is; more generally they scale as. We discuss both positively correlated disorder () and anticorrelated, or “hyperuniform,” disorder (). We argue that anticorrelations in the disorder are generally irrelevant at the MBL transition. Moreover, assuming the MBL transition is described by the recently developed renormalization-group scheme of Morningstaret al.[Phys. Rev. B 102, 125134 (2020)10.1103/PhysRevB.102.125134], we argue that even positively correlated disorder leaves the critical theory unchanged, although it modifies certain properties of the many-body localized phase.
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