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:
影响因子:
--
通讯作者:
Doran R
中科院分区:
文献类型:
--
作者:
Doran R
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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DOI:
10.1016/j.cpc.2019.03.004
发表时间:
2019
期刊:
Comput. Phys. Commun.
影响因子:
--
作者:
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DOI:
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发表时间:
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影响因子:
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作者:
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