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arXiv 1706.04299cond-mat.mes-hall
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经典信息驱动的量子点热机

Classical information driven quantum dot thermal machines

Abhin Shah, Sai Vinjanampathy, Bhaskaran Muralidharan

摘要:

我们分析了量子点热机的瞬态响应,这种热机可以由作为经典信息源的超精细相互作用驱动。我们的装置包括一个量子点耦合到两个接触,驱动热流,同时耦合到一个核自旋浴。根据参数范围的不同,量子点热机既可以作为电池也可以作为发动机。量子点中的电子通过超精细自旋翻转过程与核自旋相互作用,如在诸如GaAs量子点的固态系统中通常看到的。这种系统中的超精细相互作用通常被视为量子信息处理的障碍,可以有利地被视为经典信息流进入热机设置的驱动剂。我们将这种信息流与兰道尔擦除核旋转浴,导致电池操作。我们进一步证明,即使在点上的电压偏置下,该设置也可以作为瞬态电源执行。专注于瞬态热电操作,我们的分析清楚地表明兰道尔擦除的作用是提供比传统量子点热电装置更高的输出功率,并且效率高于稳态下相同卡诺循环的效率,这与最近提出的反馈控制器系统效率界限一致。本文还研究了核自旋弛豫过程在这些方面的作用。最后,我们引入了点中的库仑相互作用,分析了系统的瞬态热电响应。我们的研究结果阐述了有效地利用不太理想的散射过程作为一个非平衡源的香农信息流在热机器和可能出现的可能性,从使用的量子信息源。

英文摘要:

We analyze the transient response of quantum dot thermal machines that can be driven by hyperfine interaction acting as a source of classical information. Our setup comprises a quantum dot coupled to two contacts that drive heat flow while coupled to a nuclear spin bath. The quantum dot thermal machines operate both as batteries and as engines, depending on the parameter range. The electrons in the quantum dot interact with the nuclear spins via hyperfine spin-flip processes as typically seen in solid state systems such as GaAs quantum dots. The hyperfine interaction in such systems, which is often treated as a deterrent for quantum information processing, can favorably be regarded as a driving agent for classical information flow into a heat engine setup. We relate this information flow to Landauer's erasure of the nuclear spin bath, leading to a battery operation. We further demonstrate that the setup can perform as a transient power source even under a voltage bias across the dot. Focusing on the transient thermoelectric operation, our analysis clearly indicates the role of Landauer's erasure to deliver a higher output power than a conventional quantum dot thermoelectric setup and an efficiency greater than that of an identical Carnot cycle in steady state, which is consistent with recently proposed bounds on efficiency for systems subject to a feedback controller. The role of nuclear spin relaxation processes on these aspects is also studied. Finally, we introduce the Coulomb interaction in the dot and analyze the transient thermoelectric response of the system. Our results elaborate on the effective use of somewhat undesirable scattering processes as a non-equilibrium source of Shannon information flow in thermal machines and the possibilities that may arise from the use of a quantum information source.

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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