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arXiv 1901.07597cond-mat.stat-mechcond-mat.quant-gas
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量子二聚体模型中的突现玻璃态动力学

Emergent Glassy Dynamics in a Quantum Dimer Model

Johannes Feldmeier, Frank Pollmann, Michael Knap

摘要:

我们考虑二维量子二聚体模型的猝灭动力学,并确定其运动学约束的作用。我们解释的非平衡动力学的基本平衡相变组成的BKT之间的过渡的柱状有序的价键固体(VBS)和价键液体(VBL),以及一个交错的VBS和VBL之间的第一级过渡。我们发现,从柱状VBS的淬火是遍历和序参量和空间相关性迅速放松到他们的热平衡。相比之下,一阶跃迁的交错侧在数值上可访问的时间尺度上不显示热化。基于该模型的运动学约束,我们发现了一种机制的放松,依赖于紧急的,高度失谐的多缺陷过程中的交错的背景下,这引起了缓慢的,玻璃态的动力学在低温下,即使在热力学极限。

英文摘要:

We consider the quench dynamics of a two-dimensional quantum dimer model and determine the role of its kinematic constraints. We interpret the non-equilibrium dynamics in terms of the underlying equilibrium phase transitions consisting of a BKT-transition between a columnar ordered valence bond solid (VBS) and a valence bond liquid (VBL), as well as a first order transition between a staggered VBS and the VBL. We find that quenches from a columnar VBS are ergodic and both order parameters and spatial correlations quickly relax to their thermal equilibrium. By contrast, the staggered side of the first order transition does not display thermalization on numerically accessible timescales. Based on the model's kinematic constraints, we uncover a mechanism of relaxation that rests on emergent, highly detuned multi-defect processes in a staggered background, which gives rise to slow, glassy dynamics at low temperatures even in the thermodynamic limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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