Environmental rocking ratchet: Environmental rectification by a harmonically driven avoided crossing.
Environmental rocking ratchet: Environmental rectification by a harmonically driven avoided crossing.
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DOI：
10.1103/physreve.96.042134
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
P. Nalbach;N. Klinkenberg;T. Palm;N. Müller
中科院分区：
文献类型：
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作者：
P. Nalbach;N. Klinkenberg;T. Palm;N. Müller
我们提出了一个摇摆棘轮设计为一个对称的量子两态系统驱动的一个单一的周期性的谐波力和影响对称的热涨落。我们表明，必要的对称性破缺可以动态地实现耦合到两个状态之间的能量差和它们之间的隧道耦合的热环境。量子两态系统通过避免交叉而被谐波周期驱动。相应地驱动的耗散量子动力学平均导致两种状态之间的有限布居数差异。这就导致了粒子的定向传输。
We propose a rocking ratchet designed as a symmetric quantum two-state system driven by a single periodic harmonic force and influenced symmetrically by thermal fluctuations. We show that the necessary broken symmetry can dynamically be achieved by a thermal environment that couples to the energy difference between the two states and the tunnel coupling between them. The quantum two-state system is driven by the harmonic periodic drive through its avoided crossing. The correspondingly driven dissipative quantum dynamics results on average in a finite population difference between both states. This then causes directed particle transport.