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Glassy states in fermionic systems with strong disorder and interactions

机译:铁离子系统中的玻璃态具有很强的无序性和相互作用

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We study the competition between interactions and disorder in two dimensions. Whereas a noninteracting system is always Anderson localized by disorder in two dimensions, a pure system can develop a Mott gap for sufficiently strong interactions. Within a simple model, with short-ranged repulsive interactions, we show that, even in the limit of strong interaction, the Mott gap is completely washed out by disorder for an infinite system for dimensions D ≤ 2, leading to a glassy state. Moreover, the Mott insulator cannot maintain a broken symmetry in the presence of disorder. We then show that the probability of a nonzero gap as a function of system size falls onto a universal curve, reflecting the glassy dynamics. An analytic calculation is also presented in one dimension that provides further insight into the nature of slow dynamics.
机译:我们从两个维度研究相互作用和无序之间的竞争。非交互系统始终是Anderson在二维上受无序约束的地方,而纯系统可以为足够强的交互作用产生Mott间隙。在一个具有短程排斥相互作用的简单模型中,我们表明,即使在强相互作用的极限下,对于尺寸D≤2的无限系统,Mott间隙也完全被无序冲刷掉,从而形成玻璃态。此外,莫特绝缘子在无序情况下不能保持对称的破坏。然后,我们表明,作为系统大小函数的非零间隙的概率落在一条通用曲线上,反映了玻璃动力学。一维还提供了一种分析计算,可以进一步了解慢速动力学的性质。

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