Electron Counting Statistics for Non-Additive Environments

Abstract

Molecular electronics is a rapidly developing field focused on using molecules as the structural basis for electronic components. It is common in such devices for the system of interest to couple simultaneously to multiple environments. Here we consider a model comprised of a double quantum dot (or molecule) coupled strongly to vibrations and weakly to two electronic leads held at arbitrary bias voltage. The strong vibrational coupling invalidates treating the bosonic and electronic environments simply as acting additively, as would be the case in the weak coupling regime or for flat leads at infinite bias. Instead, making use of the reaction coordinate framework we incorporate the dominant vibrational coupling effects within an enlarged system Hamiltonian. This allows us to derive a non-additive form for the lead couplings that accounts properly for the influence of strong and non-Markovian coupling between the double dot system and the vibrations. Applying counting statistics techniques we track electron flow between the double dot and the electronic leads, revealing both strong-coupling and non-additive effects in the electron current, noise and Fano factor.

arXiv comment16 pages, 6 figures. v2 - close to published version

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Cited by in corpus (13)

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• Open quantum system dynamics and the mean force Gibbs state
• Exact dynamics of non-additive environments in non-Markovian open quantum systems
• Quantum Brownian Motion for Magnets
• Markovian Treatment of non-Markovian Dynamics of Open Fermionic Systems
• Local master equations bypass the secular approximation
• Pushing the limits of the reaction-coordinate mapping
• Enhancing quantum transport efficiency by tuning non-Markovian dephasing
• Strong coupling in thermoelectric nanojunctions: a reaction coordinate framework
• Quantum versus classical transport of energy in coupled two-level systems
• Enhanced entanglement in multi-bath spin-boson models
• Time-Dependent Dephasing and Quantum Transport
• Nonequilibrium thermal transport and photon squeezing in a quadratic qubit-resonator system