Beyond mean-field dynamics of ultra-cold bosonic atoms in higher dimensions: facing the challenges with a multi-configurational approach
Beyond mean-field dynamics of ultra-cold bosonic atoms in higher dimensions: facing the challenges with a multi-configurational approach
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超越高维超冷玻色子原子的平均场动力学:用多配置方法应对挑战
DOI:
10.1088/1361-6455/50/3/034003
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
P. Schmelcher
中科院分区:
文献类型:
--
作者:
V. Bolsinger;S. Krönke;P. Schmelcher
Exploring the impact of dimensionality on the quantum dynamics of interacting bosons in traps including particle correlations is an interesting but challenging task. Due to the different participating length scales, the modelling of the short-range interactions in three dimensions plays a special role. We review different approaches for the latter and elaborate that for multi-configurational computational strategies, finite-range potentials are adequate resulting in the need for large grids to resolve the relevant length scales. This results in computational challenges, which include the exponential scaling of complexity with the number of atoms. We show that the recently developed ab initio multi-layer multi-configurational time-dependent Hartee method for bosons (ML–MCTDHB)(2013 J. Chem. Phys. 139 134103) can face both numerical challenges and present an efficient numerical implementation of ML–MCTDHB in three spatial dimensions, particularly suited to describe the quantum dynamics for elongated traps. The beneficial scaling of our approach is demonstrated by studying the tunnelling dynamics of bosonic ensembles in a double well. Comparing three-dimensional with quasi-one dimensional simulations, we find dimensionality-induced effects in the density. Furthermore, we study the crossover from weak transversal confinement, where a mean-field description of the system is sufficient, towards tight transversal confinement, where particle correlations and beyond mean-field effects are pronounced.
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DOI:
10.1088/1742-6596/691/1/012015
发表时间:
2014-12
期刊:
Journal of Physics: Conference Series
影响因子:
--
作者:
S. Klaiman;O. Alon
通讯作者:
S. Klaiman;O. Alon
影响因子:
2.9
作者:
Shachar Klaiman;Axel U. J. Lode;Alexej I. Streltsov;Lorenz S. Cederbaum;Ofir E. Alon
通讯作者:
Ofir E. Alon
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
S. Krönke;Lushuai Cao;O. Vendrell;P. Schmelcher
通讯作者:
P. Schmelcher
影响因子:
2.9
作者:
T. Ernst;D. Hallwood;J. Gulliksen;H. Meyer;J. Brand
通讯作者:
T. Ernst;D. Hallwood;J. Gulliksen;H. Meyer;J. Brand
DOI:
10.1007/978-1-4899-2326-4_14
发表时间:
1992
期刊:
The European Physical Journal D
影响因子:
--
作者:
J. Light
通讯作者:
J. Light