Simulating electron-vibron energy transfer with quantum dots and resonators

• URL: http://arxiv.org/abs/2407.03161v1
• Date: Wed, 3 Jul 2024 14:35:17 GMT
• Title: Simulating electron-vibron energy transfer with quantum dots and resonators
• Authors: Cecilie Hermansen, Mara Caltapanides, Volker Meden, Jens Paaske,
• Abstract summary: Gateable semiconductor quantum dots (QDs) provide a versatile platform for analog quantum simulations. We represent the molecular vibrational modes by single-mode microwave resonators coupled capacitively to the QDs. We study the gate-tunable energy transfer from a voltage-biased triple quantum dot (TQD) system to a single damped resonator mode.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Gateable semiconductor quantum dots (QDs) provide a versatile platform for analog quantum simulations of electronic many-body systems. In particular, QD arrays offer a natural representation of the interacting $\pi$-electron system of small hydrocarbons. Here we investigate the prospects for extending QD simulators to encompass also the nuclear degrees of freedom. We represent the molecular vibrational modes by single-mode microwave resonators coupled capacitively to the QDs and study the gate-tunable energy transfer from a voltage-biased triple quantum dot (TQD) system to a single damped resonator mode. We determine the QD population inversions, the corresponding charge and energy currents as well as the resonator photon number, using Lindblad master equations and lowest-order perturbation theory within Keldysh Green function formalism. Along the way, we discuss the merits and shortcomings of the two methods.A central result is the interrelation of a pronounced minimum in the charge current with a maximum in energy transfer, arising from a gate-tunable interference effect in the molecular orbitals of the TQD electron system.

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