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arXiv 0709.0410cond-mat.stat-mech
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一类有限量子模型从扩散动力学到弹道动力学的转变

Transition from diffusive to ballistic dynamics for a class of finite quantum models

Robin Steinigeweg, Heinz-Peter Breuer, Jochen Gemmer

摘要:

研究了一类有限量子系统中弱耦合子单元间激发几率的输运。结果表明,输运量的动力学行为取决于所考虑的长度尺度,e。例如,在一个实施例中,所引入的扩散和弹道输运之间的区别似乎是一个尺度依赖的概念,特别是因为在小尺度的极限和大尺度的极限中发现了从扩散到弹道行为的转变。所有这些结果都是通过应用无时间卷积投影算子技术得到的,并通过对一系列模型参数进行精确对角化得到的全时相关薛定谔方程的数值解进行了验证。

英文摘要:

The transport of excitation probabilities amongst weakly coupled subunits is investigated for a class of finite quantum systems. It is demonstrated that the dynamical behavior of the transported quantity depends on the considered length scale, e. g., the introduced distinction between diffusive and ballistic transport appears to be a scale-dependent concept, especially since a transition from diffusive to ballistic behavior is found in the limit of small as well as in the limit of large length scales. All these results are derived by an application of the time-convolutionless projection operator technique and are verified by the numerical solution of the full time-dependent Schroedinger equation which is obtained by exact diagonalization for a range of model parameters.

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