arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.04403cond-mat.quant-gas
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玻色环中的自发电流

Spontaneous currents in a bosonic ring

Damian Makiela, Maciej M. Maska

摘要:

本文用动力学蒙特卡罗方法研究了一维环形晶格中非相互作用玻色子的非平衡动力学。该系统近似的经典XY模型(动力学项被忽略),然后进行模拟的平面经典自旋。我们研究了有限时间淬火到零温度的动力学。如果猝灭足够慢,系统可以平衡并最终达到具有均匀自旋排列的基态。然而,我们发现,如果淬火是快于弛豫速率,系统可以锁定在一个载流亚稳态,其特征在于由一个非零绕组数。我们分析了零温度状态如何依赖于淬火速率。

英文摘要:

Nonequilibrium dynamics of noninteracting bosons in a one-dimensional ring-shaped lattice is studied by means of the Kinetic Monte Carlo method. The system is approximated by the classical XY model (the kinetic term is neglected) and then the simulations are performed for the planar classical spins. We study the dynamics that follows a finite-time quench to zero temperature. If the quench is slow enough the system can equilibrate and finally reaches the ground state with uniform spin alignment. However, we show that if the quench is faster than the relaxation rate, the system can get locked in a current-carrying metastable state characterized by a nonzero winding number. We analyze how the zero-temperature state depends on the quench rate.

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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