Non-adiabatic Rectification and Current Reversal in Electron Pumps

Abstract

Pumping of electrons through nano-scale devices is one of the fascinating achievements in the field of nano-science with a wide range of applications. To optimize the performance of pumps, operating them at high frequencies is mandatory. We consider the influence of fast periodic driving on the average charge transferred through a quantum dot. We show that it is possible to reverse the average current by sweeping the driving frequency only. In connection with this, we observe a rectification of the average current for high frequencies. Since both effects are very robust, as corroborated by analytical results for harmonic driving, they offer a new way of controlling electron pumps.

5 pages, 3 figures

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• Non-adiabatic quantized charge pumping with tunable-barrier quantum dots: a review of current progress
• Electron pumping in the strong coupling and non-Markovian regime: A reaction coordinate mapping approach
• A new approach to time-dependent transport through an interacting quantum dot within Keldysh formalism
• Optimization of quantized charge pumping using full counting statistics
• Functional renormalization group in Floquet space
• Full Counting Statistics of a Non-adiabatic Electron Pump
• Time-dependent quantum transport through an interacting quantum dot beyond sequential tunneling: second-order quantum rate equations
• Emergence of Bloch oscillations in one-dimensional systems
• Hierarchical quantum master equation approach to charge transport in molecular junctions with time-dependent molecule-lead coupling strengths
• Time-dependent framework for energy and charge currents in nanoscale systems
• Coupling-energy driven pumping through quantum dots: Role of coherences