dc.contributor.author
Arrachea, Liliana
dc.contributor.author
Bode, Niels
dc.contributor.author
Oppen, Felix von
dc.date.accessioned
2018-06-08T03:10:49Z
dc.date.available
2015-02-04T07:32:12.841Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/14645
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-18837
dc.description.abstract
An important goal in nanoelectromechanics is to cool the vibrational motion,
ideally to its quantum ground state. Cooling by an applied charge current is a
particularly simple and hence attractive strategy to this effect. Here we
explore this phenomenon in the context of the general theory of
thermoelectrics. In linear response, this theory describes thermoelectric
refrigerators in terms of their cooling efficiency η and figure of merit ZT.
We show that both concepts carry over to phonon cooling in
nanoelectromechanical systems. As an important consequence, this allows us to
discuss the efficiency of phonon refrigerators in relation to the fundamental
Carnot efficiency. We illustrate these general concepts by thoroughly
investigating a simple double-quantum-dot model with the dual advantage of
being quite realistic experimentally and amenable to a largely analytical
analysis theoretically. Specifically, we obtain results for the efficiency,
the figure of merit, and the effective temperature of the vibrational motion
in two regimes. In the quantum regime in which the vibrational motion is fast
compared to the electronic degrees of freedom, we can describe the electronic
and phononic dynamics of the model in terms of master equations. In the
complementary classical regime of slow vibrational motion, the dynamics is
described in terms of an appropriate Langevin equation. Remarkably, we find
that the efficiency can approach the maximal Carnot value in the quantum
regime, with large associated figures of merit. In contrast, the efficiencies
are typically far from the Carnot limit in the classical regime. Our
theoretical results should provide guidance to implementing efficient
vibrational cooling of nanoelectromechanical systems in the laboratory.
en
dc.rights.uri
http://journals.aps.org/authors/transfer-of-copyright-agreement
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik
dc.title
Vibrational cooling and thermoelectric response of nanoelectromechanical
systems
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation
Physical Review B. - 90 (2014), 12, Artikel Nr.125450
dc.identifier.sepid
40986
dcterms.bibliographicCitation.doi
10.1103/PhysRevB.90.125450
dcterms.bibliographicCitation.url
http://dx.doi.org/10.1103/PhysRevB.90.125450
refubium.affiliation
Physik
de
refubium.affiliation.other
Institut für Theoretische Physik
refubium.mycore.fudocsId
FUDOCS_document_000000021747
refubium.resourceType.isindependentpub
no
refubium.mycore.derivateId
FUDOCS_derivate_000000004464
dcterms.accessRights.openaire
open access
dcterms.isPartOf.issn
1098-0121