Scaling and Localization in Multipole-Conserving Diffusion.

Scaling and Localization in Multipole-Conserving Diffusion.
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多极守恒扩散中的缩放和定位。

DOI:
10.1103/physrevlett.132.137102
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发表时间:
2023
影响因子:
8.6
通讯作者:
Sunghan Ro
Sunghan Ro
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
J. Han;E. Lake;Sunghan Ro

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我们研究了动力学守恒于总质心的经典粒子系统中的扩散。这一守恒定律导致了几个有趣的结果。在有限系统中,它允许在系统边界附近指数局部化的平衡分布。它还产生了一种不同寻常的平衡方法,它在d维表现出以动力学指数z=4+d的标度。对于守恒高密度矩的动力学也存在类似的现象,我们使用一族非线性扩散方程系统地对其进行分类。在量子环境中,类似的费米子系统被展示为形成实空间的费米面,而玻色子的版本展示了实空间中玻色-爱因斯坦凝聚的模拟。
We study diffusion in systems of classical particles whose dynamics conserves the total center of mass. This conservation law leads to several interesting consequences. In finite systems, it allows for equilibrium distributions that are exponentially localized near system boundaries. It also yields an unusual approach to equilibrium, which in d dimensions exhibits scaling with dynamical exponent z=4+d. Similar phenomena occur for dynamics that conserves higher moments of the density, which we systematically classify using a family of nonlinear diffusion equations. In the quantum setting, analogous fermionic systems are shown to form real-space Fermi surfaces, while bosonic versions display a real-space analog of Bose-Einstein condensation.
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