Charge and energy transfer in ac-driven Coulomb-coupled double quantum dots

Abstract

We study the dynamics of charge and energy currents in a Coulomb-coupled double quantum dot system, when only one of the two dots is adiabatically driven by a time-periodic gate that modulates its energy level. Although the Coulomb coupling does not allow for electron transfer between the dots, it enables an exchange of energy between them which induces a time variation of charge in the undriven dot. We describe the effect of electron interactions at low temperature using a time-dependent slave-spin 1 formulation within mean-field that efficiently captures the main effects of the strong correlations as well as the dynamical nature of the driving. We find that the currents induced in the undriven dot due to the mutual friction between inter-dot electrons are same order than those generated in the adiabatically driven dot. Interestingly, up to 43$\%$ percent of the energy injected by the ac sources can be transferred from the driven dot to the undriven one. We complete our analysis by studying the impact of the Coulomb interaction on the resistance of the quantum dot that is driven by the gate.

12 pages, 8 figures

References in corpus (8)

• Strong Coulomb drag and broken symmetry in double-layer graphene
• Single-electron heat diode
• Coulomb drag by small momentum transfer between quantum wires
• Coulomb Drag and High Resistivity Behavior in Double Layer Graphene
• Giant Fluctuations of Coulomb Drag in a Bilayer System
• Coulomb drag in quantum circuits
• From non-equilibrium Green's functions to quantum master equations for the density matrix and out-of-time-order correlators: steady state and adiabatic dynamics
• Statistics of heat transport across capacitively coupled double quantum dot circuit