Crossover in the dynamical critical exponent of a quenched two-dimensional Bose gas

Crossover in the dynamical critical exponent of a quenched two-dimensional Bose gas
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淬火二维玻色气体的动力学临界指数的交叉

DOI:
10.1103/physrevresearch.3.013212
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发表时间:
2021
影响因子:
4.2
通讯作者:
Groszek A
Groszek A
中科院分区:
--
文献类型:
--
作者:
Groszek A

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我们研究了均匀玻色气体在淬灭后进入有序相的二维相序动力学。我们通过在经典场方法论中进行数值模拟来探索耗散和保守进化之间的交叉。无论耗散强度如何,我们都发现了普遍标度的明显证据,动态临界指数表征了相关长度的增长。在耗散极限中,我们发现增长符合对数修正规律,而指数与以前的研究一致。将耗散减小到保守极限,我们得到了期望增长律的强有力的数值证据。然而,我们观察到一个平滑的交叉,在一个小的有限耗散强度下收敛到一个明显低于2的异常值。我们表明,这个较低的指数可能归因于幂律涡迁移率引起的涡声相互作用。
We study the phase-ordering dynamics of a uniform Bose gas in two dimensions following a quench into the ordered phase. We explore the crossover between dissipative and conservative evolution by performing numerical simulations within the classical field methodology. Regardless of the dissipation strength, we find clear evidence for universal scaling, with dynamical critical exponentcharacterizing the growth of the correlation length. In the dissipative limit we find growth consistent with the logarithmically corrected law, and exponent, in agreement with previous studies. Decreasing the dissipation towards the conservative limit, we find strong numerical evidence for the expected growth law. However, we observe a smooth crossover inthat converges to an anomalous value distinctly lower than 2 at a small finite dissipation strength. We show that this lower exponent may be attributable to a power-law vortex mobility arising from vortex-sound interactions.
DOI: 10.1103/physrevb.103.045302
发表时间: 2020
期刊: arXiv: Quantum Gases
影响因子: --
作者:
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通讯作者: M. Wouters
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影响因子: 8.6
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