Numerical method for the projected Gross-Pitaevskii equation in an infinite rotating two-dimensional Bose gas.

Numerical method for the projected Gross-Pitaevskii equation in an infinite rotating two-dimensional Bose gas.
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无限旋转二维玻色气体中投影 Gross-Pitaevskii 方程的数值方法。

DOI:
10.1103/physreve.102.033309
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发表时间:
2020
期刊:
Physical review. E
影响因子:
--
通讯作者:
Doran R
Doran R
中科院分区:
--
文献类型:
--
作者:
Doran R

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我们提出了一种在无限旋转玻色-爱因斯坦凝聚体中演化投影的Gross-Pitaevskii方程的方法,该凝聚体的基态是涡旋晶格。在不考虑边界和边缘效应的情况下,我们使用准周期边界条件研究了该系统中块体超流体的行为。我们还给出了在这些边界条件下BEC位相的朗道规范表达式。我们的谱表示使用单体哈密顿量的本征函数作为基函数。由于这些基函数没有已知的精确求积规则,我们近似实现了与能量截断相关的投影,但我们证明了通过选择合适的精细空间网格,所产生的误差可以忽略不计。我们展示了空间网格的大小和朗道能级数等模拟参数如何影响该模型的收敛。加入耗散后,我们用我们的方法求出了涡旋的晶格基态。然后我们可以微扰基态,来研究晶格的熔化。
We present a method for evolving the projected Gross-Pitaevskii equation in an infinite rotating Bose-Einstein condensate, the ground state of which is a vortex lattice. We use quasiperiodic boundary conditions to investigate the behavior of the bulk superfluid in this system, in the absence of boundaries and edge effects. We also give the Landau gauge expression for the phase of a BEC subjected to these boundary conditions. Our spectral representation uses the eigenfunctions of the one-body Hamiltonian as basis functions. Since there is no known exact quadrature rule for these basis functions we approximately implement the projection associated with the energy cutoff, but we show that by choosing a suitably fine spatial grid the resulting error can be made negligible. We show how the convergence of this model is affected by simulation parameters such as the size of the spatial grid and the number of Landau levels. Adding dissipation, we use our method to find the lattice ground state forvortices. We can then perturb the ground-state, to investigate the melting of the lattice.
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