http://www.cnr.it/ontology/cnr/individuo/prodotto/ID286781

Geometric quantum pumping in the presence of dissipation (Articolo in rivista)

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Geometric quantum pumping in the presence of dissipation (Articolo in rivista) (literal)

Anno

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Alternative label

Thingna J.[ 1,2 ]; Hanggi P.[ 1,2,3 ] ; Fazio R.[ 4,5,6 ]; Campisi M.[ 1,2,4,5 ] (2014)
Geometric quantum pumping in the presence of dissipation
in Physical review. B, Condensed matter and materials physics
(literal)

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Thingna J.[ 1,2 ]; Hanggi P.[ 1,2,3 ] ; Fazio R.[ 4,5,6 ]; Campisi M.[ 1,2,4,5 ] (literal)

Pagina inizio

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Note

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[ 1 ] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany [ 2 ] Nanosyst Initiat Munich, D-80799 Munich, Germany [ 3 ] Natl Univ Singapore, Blk S12, Dept Phys, Singapore 117551, Singapore [ 4 ] CNR, Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy [ 5 ] CNR, Ist Nanosci, I-56126 Pisa, Italy [ 6 ] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore (literal)

Titolo

Abstract

The charge transported when a quantum pump is adiabatically driven by time-dependent external forces in presence of dissipation is given by the line integral of a pumping field F. We give a general expression of F in terms of quantum correlation functions evaluated at fixed external forces. Hence, an advantage of our method is that it transforms the original time-dependent problem into an autonomous one. Yet another advantage is that the curl of F gives immediate visual information about the geometric structures governing dissipative quantum pumping. This can be used in a wide range of experimental cases, including electron pumps based on quantum dots and Cooper-pair pumps based on superconducting devices. Applied to a Cooper-pair sluice, we find an intriguing dissipation-induced enhancement of charge pumping, reversals of current, and emergence of asymmetries. This geometric method thus enables one to unveil a plethora of beneficial, dissipation-assisted operation protocols. (literal)

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