We study the relation between quantum pumping of charge and the work exchanged with the driving potentials in a strongly interacting ac-driven quantum dot. We work in the large-interaction limit and in the adiabatic pumping regime, and we develop a treatment that combines the time-dependent slave-boson approximation with linear response in the rate of change in the ac potentials. We find that the time evolution of the system can be described in terms of equilibrium solutions at every time. We analyze the effect of the electronic interactions on the performance of the dot when operating as a quantum motor. The main two effects of the interactions are a shift of the resonance and an enhancement of the efficiency with respect to a noninteracting dot. This is due to the appearance of additional ac parameters accounting for the interactions that increase the pumping of particles while decreasing the conductance.

Enhanced performance of a quantum-dot-based nanomotor due to Coulomb interactions / Ludovico, María Florencia; Capone, Massimo. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 98:23(2018), pp. 1-13. [10.1103/PhysRevB.98.235409]

Enhanced performance of a quantum-dot-based nanomotor due to Coulomb interactions

Capone, Massimo
2018

Abstract

We study the relation between quantum pumping of charge and the work exchanged with the driving potentials in a strongly interacting ac-driven quantum dot. We work in the large-interaction limit and in the adiabatic pumping regime, and we develop a treatment that combines the time-dependent slave-boson approximation with linear response in the rate of change in the ac potentials. We find that the time evolution of the system can be described in terms of equilibrium solutions at every time. We analyze the effect of the electronic interactions on the performance of the dot when operating as a quantum motor. The main two effects of the interactions are a shift of the resonance and an enhancement of the efficiency with respect to a noninteracting dot. This is due to the appearance of additional ac parameters accounting for the interactions that increase the pumping of particles while decreasing the conductance.
98
23
1
13
235409
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.235409
https://arxiv.org/abs/1808.10780
Ludovico, María Florencia; Capone, Massimo
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/88210
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