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arXiv 1402.4796cond-mat.dis-nn
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一维准周期势中弱相互作用玻色子的离域化

Delocalization of weakly interacting bosons in a 1D quasiperiodic potential

V. P. Michal, B. L. Altshuler, G. V. Shlyapnikov

摘要:

本文考虑了一维准周期势(Aubry-Azbel-Harper模型)中弱相互作用玻色子的局域单粒子态。我们证明了粒子间的相互作用可能导致多体离域,并得到了有限温度相图。与直觉相反,在宽的参数范围内,随着温度的升高,离域需要更强的耦合。这意味着玻色子系统可以在加热下经历从流体到绝缘体(玻璃)状态的转变。

英文摘要:

We consider weakly interacting bosons in a 1D quasiperiodic potential (Aubry-Azbel-Harper model) in the regime where all single-particle states are localized. We show that the interparticle interaction may lead to the many-body delocalization and we obtain the finite-temperature phase diagram. Counterintuitively, in a wide range of parameters the delocalization requires stronger cou- pling as the temperature increases. This means that the system of bosons can undergo a transition from a fluid to insulator (glass) state under heating.

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