Coherent quantum ratchets driven by tunnel oscillations: Fluctuations and correlations

2012/07/20 by Robert Hussein, Sigmund Kohler
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Biasing #Current (fluid) #Fano factor #Master equation #Noise (video) #Optics #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum master equation #Quantum mechanics #Ratchet #Ratchet effect #Shot noise #Voltage #cond-mat.mes-hall #stochastic dynamics and bifurcation

paper · pdf · doi:10.1103/physrevb.86.115452

published as Phys. Rev. B 86, 115452 (2012) · 10 pages

arxiv created 2012/07/20 · openalex publication_date 2012/09/27 · arxiv updated 2012/09/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study two capacitively coupled double quantum dots focusing on the regime in which one double dot is strongly biased, while no voltage is applied to the other. Then the latter experiences an effective driving force which induces a ratchet current, i.e., a dc current in the absence of a bias voltage. Its current noise is investigated with a quantum master equation in terms of the full-counting statistics. This reveals that whenever the ratchet current is large, it also exhibits some features of a Poissonian process. By eliminating the drive circuit, we obtain a reduced master equation which provides analytical results for the Fano factor.

Citations

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