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摘要翻译：
我们研究了与振子相互作用的双中心系统的跃迁几率和相干性。这两种性质都取决于最初的准备。振子是在热状态下制备的，尽管它不能被认为是一个扩展的浴，但由于动力学中涉及大量的态，它会产生退相干。在振子内部位移的情况下，发生了与振子模纠缠的相干变化动力学。然而，相干性随着振子质量的增加而降低，从而产生越来越大的再相干时间。用精确对角化方法进行了计算，并与两种半经典近似进行了比较。量子效应的作用在长时间动力学中得到了突出，在长时间动力学中，半经典方法产生了耗散行为。此外，我们发现，即使在半经典近似下，也必须考虑振子动力学，以便再现热激活的跃迁几率增强。
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英文标题：
《Charge transfer and coherence dynamics of tunnelling system coupled to a
harmonic oscillator》
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作者：
Simone Paganelli and Sergio Ciuchi
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最新提交年份：
2008
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分类信息：
一级分类：Physics 物理学
二级分类：Other Condensed Matter 其他凝聚态物质
分类描述：Work in condensed matter that does not fit into the other cond-mat classifications
在不适合其他cond-mat分类的凝聚态物质中工作
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
We study the transition probability and coherence of a two-site system, interacting with an oscillator. Both properties depend on the initial preparation. The oscillator is prepared in a thermal state and, even though it cannot be considered as an extended bath, it produces decoherence because of the large number of states involved in the dynamics. In the case in which the oscillator is intially displaced a coherent dynamics of change entangled with oscillator modes takes place. Coherency is however degraded as far as the oscillator mass increases producing a increasingly large recoherence time. Calculations are carried on by exact diagonalization and compared with two semiclassical approximations. The role of the quantum effects are highlighted in the long-time dynamics, where semiclassical approaches give rise to a dissipative behaviour. Moreover, we find that the oscillator dynamics has to be taken into account, even in a semiclassical approximation, in order to reproduce a thermally activated enhancement of the transition probability.
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PDF链接：
https://arxiv.org/pdf/801.1266
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