arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.04825cond-mat.stat-mechcond-mat.dis-nncond-mat.quant-gas
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临界点附近的多体局域化

Many-body localization near the critical point

Alan Morningstar, David A. Huse, John Z. Imbrie

摘要:

研究了具有猝灭随机性和短程相互作用的一维量子系统中的多体局域化(MBL)相变。根据最近的工作,我们使用强随机性重整化群(RG)的方法,其中的相变是由于所谓的雪崩不稳定性的MBL相。我们表明,临界行为可以确定在此RG分析。在一个粗略的$\textit{qualitative}$水平上,临界固定点附近的RG流类似于前面所示的Kosterlitz无边界(KT)流,但在临界行为上有重要的差异。因此,我们表明,这种MBL过渡是在一个新的普适类,是从KT不同。关联长度的发散对应于临界指数$ν\rightarrow \infty$,但发散比KT跃迁弱。

英文摘要:

We examine the many-body localization (MBL) phase transition in one-dimensional quantum systems with quenched randomness and short-range interactions. Following recent works, we use a strong-randomness renormalization group (RG) approach where the phase transition is due to the so-called avalanche instability of the MBL phase. We show that the critical behavior can be determined analytically within this RG. On a rough $\textit{qualitative}$ level the RG flow near the critical fixed point is similar to the Kosterlitz-Thouless (KT) flow as previously shown, but there are important differences in the critical behavior. Thus we show that this MBL transition is in a new universality class that is different from KT. The divergence of the correlation length corresponds to critical exponent $ν\rightarrow \infty$, but the divergence is weaker than for the KT transition.

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