[en] We describe a single-level quantum dot in contact with two leads as a nanoscale finite-time thermodynamic
machine. The dot is driven by an external stochastic force that switches its energy between two values. In the
isothermal regime, it can operate as a rechargeable battery by generating an electric current against the applied
bias in response to the stochastic driving and then redelivering work in the reverse cycle. This behavior is
reminiscent of the Parrondo paradox. If there is a thermal gradient the device can function as a work-generating
thermal engine or as a refrigerator that extracts heat from the cold reservoir via the work input of the stochastic
driving. The efficiency of the machine at maximum power output is investigated for each mode of operation, and
universal features are identified.
Disciplines :
Physique
Auteur, co-auteur :
ESPOSITO, Massimiliano ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Kumar, Niraj; University of California San Diego > Department of Chemistry and Biochemistry and BioCircuits Institute
Lindenberg, Katja; University of California, San Diego > Department of Chemistry and Biochemistry and BioCircuits Institute
Van den Broeck, Christian; Universiteit Hasselt - UH
Langue du document :
Anglais
Titre :
Stochastically driven single-level quantum dot: A nanoscale finite-time thermodynamic machine and its various operational modes
