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arXiv 2302.14718quant-phcond-mat.quant-gas
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相互作用无序Tavis-Cummings模型中的多重分形性

Multifractality in the interacting disordered Tavis-Cummings model

Francesco Mattiotti, Jérôme Dubail, David Hagenmüller, Johannes Schachenmayer, Jean-Philippe Brantut, Guido Pupillo

AI总结:

该研究分析相互作用无序Tavis-Cummings模型,发现其多重分形本征态与泊松统计共存,缺乏热化,但引入可积性破缺微扰后系统转为遍历近完美导体,并提出了冷原子实现方案。

摘要:

我们分析了在半激发填充下相互作用无序Tavis-Cummings模型的谱与输运性质。我们证明,对于所有光-物质相互作用强度,泊松能级统计与希尔伯特空间中多重分形(扩展但非遍历)的本征函数共存。这与局域微扰缺乏热化相关联。我们发现,二分纠缠熵随时间对数增长,类似于多体局域系统,而自旋不平衡在强耦合下趋于零,类似于遍历相。我们表明,这些效应源于有限相互作用与模型可积性的结合。当引入小的可积性破缺微扰(最近邻跳跃)时,典型本征函数变为遍历,似乎使系统变为近完美导体,这与单激发非相互作用情况相反。我们提出了该模型在冷原子中的实现方案。

英文摘要:

We analyze the spectral and transport properties of the interacting disordered Tavis-Cummings model at half excitation filling. We demonstrate that a Poissonian level statistics coexists with eigenfunctions that are multifractal (extended, but non-ergodic) in the Hilbert space, for all strengths of light-matter interactions. This is associated with a lack of thermalization for a local perturbation. We find that the bipartite entanglement entropy grows logarithmically with time, similarly to many-body localized systems, while the spin imbalance tends to zero for strong coupling, in analogy to ergodic phases. We show that these effects are due to the combination of finite interactions and integrability of the model. When a small integrability-breaking perturbation (nearest-neighbor hopping) is introduced, typical eigenfunctions become ergodic, seemingly turning the system into a near-perfect conductor, contrary to the single-excitation noninteracting case. We propose a realization of this model with cold atoms.

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