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arXiv 1005.3697cond-mat.stat-mechquant-ph
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受限系统中的临界猝灭动力学

Critical quench dynamics in confined systems

Mario Collura, Dragi Karevski

摘要:

分析了多粒子系统在缓慢扫过幂律束缚势后的相干量子演化。限制势的振幅随时间沿幂律斜坡变化,使得多粒子系统最终达到或越过临界点。在此协议下,我们推导出一般的标度律的密度的激发过程中产生的非绝热扫描的限制潜力。结果发现,平均激发密度遵循代数规律作为扫描速率的函数,其指数取决于势的时空性质。我们通过一阶绝热计算和具有变化横场的伊辛量子链的精确结果证实了我们的标度律。

英文摘要:

We analyze the coherent quantum evolution of a many-particle system after slowly sweeping a power-law confining potential. The amplitude of the confining potential is varied in time along a power-law ramp such that the many-particle system finally reaches or crosses a critical point. Under this protocol we derive general scaling laws for the density of excitations created during the non-adiabatic sweep of the confining potential. It is found that the mean excitation density follows an algebraic law as a function of the sweeping rate with an exponent that depends on the space-time properties of the potential. We confirm our scaling laws by first order adiabatic calculation and exact results on the Ising quantum chain with a varying transverse field.

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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