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arXiv 2101.09463quant-ph
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零温自旋玻色子模型中的非马尔可夫效应

Non-Markovian effects in the spin-boson model at zero temperature

Sebastian Wenderoth, Heinz-Peter Breuer, Michael Thoss

摘要:

我们研究了自旋玻色子模型中的记忆效应,使用最近提出的措施,非马尔可夫行为的基础上,一个开放的系统和它的环境之间的信息交换。采用数值精确多层多组态含时Hartree方法,我们模拟了自旋玻色子模型在零温度下的动力学参数范围很广。对于一个快速浴,即在标度限制,我们发现非马尔可夫动力学的相干衰减自旋弱系统浴耦合,而记忆效应是不存在的非相干衰减和本地化制度的较强的耦合。如果系统和浴的时间尺度是可比的,一个复杂的,非马尔可夫依赖于系统浴耦合强度的非单调观察。

英文摘要:

We investigate memory effects in the spin-boson model using a recently proposed measure for non-Markovian behavior based on the information exchange between an open system and its environment. Employing the numerical exact multilayer multiconfguration time-dependent Hartree approach, we simulate the dynamics of the spin-boson model at zero temperature for a broad range of parameters. For a fast bath, i.e. in the scaling limit, we find non-Markovian dynamics for a coherently decaying spin at weak system-bath coupling, whereas memory effects are absent for stronger coupling in the regimes of incoherent decay and localization. If the time scales of system and bath are comparable, a complex, non-monotonic dependence of non-Markovianity on the system-bath coupling strength is observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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