论文标题

量子随机电阻的半古典理论

Semi-classical theory of quantum stochastic resistors

论文作者

Jin, Tony, Ferreira, João, Bauer, Michel, Filippone, Michele, Giamarchi, Thierry

论文摘要

我们设计了一个半古典模型,以描述在外部量子随机噪声的影响下低维式晶格的传输特性。这些系统的行为是量子随机电阻,其中散装粒子传输是扩散的,并遵守欧姆/菲克定律。在这里,我们将先前的精确研究扩展到一维限制之外,并将其扩展到梯子几何形状,并探索与不同物理系统相关的不同倾向机制,从固态到冷原子。我们发现这些系统对储层的化学潜力的电导性不足。然后,我们引入了一种半古典方法,该方法与精确的数值解决方案非常吻合,并提供了对量子随机电阻器中传输的直观,更简单的解释。此外,我们发现量子梯子的电导不敏感,尽管该系统达到了不同的固定状态,但沿方向向运输方向沿横向向运输方向的连贯性不敏感。最后,我们通过讨论受剥离影响的耗散铅的案例,得出了它们有效地作为系统中颗粒的马尔可夫注射器的条件。

We devise a semi-classical model to describe the transport properties of low-dimensional fermionic lattices under the influence of external quantum stochastic noise. These systems behave as quantum stochastic resistors, where the bulk particle transport is diffusive and obeys the Ohm/Fick's law. Here, we extend previous exact studies beyond the one-dimensional limit to ladder geometries and explore different dephasing mechanisms that are relevant to different physical systems, from solid-state to cold atoms. We find a non-trivial dependence of the conductance of these systems on the chemical potential of the reservoirs. We then introduce a semi-classical approach that is in good agreement with the exact numerical solution and provides an intuitive and simpler interpretation of transport in quantum stochastic resistors. Moreover, we find that the conductance of quantum ladders is insensitive to the coherence of the dephasing process along the direction transverse to transport, despite the fact that the system reaches different stationary states. We conclude by discussing the case of dissipative leads affected by dephasing, deriving the conditions for which they effectively behave as Markovian injectors of particles in the system.

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