Adiabatic quantum motors & pumps in strongly interacting systems

BUSTOS-MARÚN, RAÚL A.; RIBETTO, FEDERICO; CALVO, HERNÁN L.

Trieste

Taller; College on Energy Transport and Energy Conversion in the Quantum Regime; 2019

The Abdus Salam International Centre for Theoretical Physics (ICTP)

We analyze the role of quantum coherences in adiabatic quantum motors and pumps [1-4] as a resource for mechanical work generation/extraction. In particular, we investigate a double quantumdot (DQD) weakly coupled to non-interacting electron reservoirs in a regime where the transport generates coherences that survive in time scales comparable to the dwelling time of particles in the system [3]. We study the performance of this device as a function of voltage and/or temperature biases and describe situations where the operation of the device is directly induced by coherences. We evaluate its efficiency in terms of a simplified model of decoherence [5] and, interestingly, wefind parameter regimes where the device can be activated by it [6][1] R. Bustos-Marún, G. Refael & F. von Oppen, ?Adiabatic quantum motors?, PRL 111, 060802 (2013).[2] H. Calvo, F. Ribetto & R. Bustos-Marún, ?Real-time diagrammatic approach to current-induced forces: Application to quantum-dot basednanomotors?, PRB 96, 165309 (2017).[3] R.-P. Riwar & J. Splettstoesser, ?Charge and spin pumping through a double quantum dot?, PRB 82, 205308 (2010).[4] P. W. Brouwer, ?Scattering approach to parametric pumping?, PRB 58, R10135 (1998).[5] H.-A. Engel & D. Loss, ?Single-spin dynamics and decoherence in a quantum dot via charge transport?, PRB 65, 195321 (2002).[6] L. Fernández-Alcázar, R. Bustos-Marún & H. Pastawski, ?Decoherence in current induced forces: Application to adiabatic quantum motors?, PRB 92 075406 (2015).