Consistent description of quantum Brownian motors operating at strong friction -: art. no. 031107
Consistent description of quantum Brownian motors operating at strong friction -: art. no. 031107
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DOI：
10.1103/physreve.70.031107
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发表时间：
2004-09-01
影响因子：
2.4
通讯作者：
Luczka, J
中科院分区：
文献类型：
--
作者：
Machura, L;Kostur, M;Luczka, J
提出了一致描述热量子态的量子 Smoluchowski 方程。特别是，它明显不会导致违反热力学第二定律。这种经过修改的动力学方程适用于研究由非热二态噪声驱动的任意形状的棘轮势中强摩擦下的分析定向量子输运。根据量子隧道效应和量子反射的相互作用，这些量子校正可以引起传输的显着增强或抑制。此外，由于这种量子涨落，电流反转的阈值变得显着变化。
A quantum Smoluchowski equation is put forward that consistently describes thermal quantum states. In particular, it notably does not induce a violation of the second law of thermodynamics. This so modified kinetic equation is applied to study analytically directed quantum transport at strong friction in arbitrarily shaped ratchet potentials that are driven by nonthermal two-state noise. Depending on the mutual interplay of quantum tunneling and quantum reflection these quantum corrections can induce both, a sizable enhancement or a suppression of transport. Moreover, the threshold for current reversals becomes markedly shifted due to such quantum fluctuations.