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dc.contributor.authorFERREIRA, MAURO
dc.date.accessioned2009-03-20T16:02:19Z
dc.date.available2009-03-20T16:02:19Z
dc.date.issued2002
dc.date.submitted2002en
dc.identifier.citationGrifoni, M., Ferreira, M. S., Peguiron, J. and Majer, J. B. `Quantum ratchets with few bands below the barrier? in Physical Review Letters, 89, (14), 2002, pp 146801-1 - 146801-4en
dc.identifier.issn0031-9007
dc.identifier.otherY
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/28469
dc.descriptionPUBLISHEDen
dc.description.abstractWe investigate directed motion in nonadiabatically rocked ratchet systems sustaining few bands below the barrier. Upon restricting the dynamics to the lowest M bands, the total system-plus-bath Hamiltonian is mapped onto a discrete tight-binding model containing all the information both on the intrawell and interwell tunneling motion. A closed form for the current in the incoherent tunneling regime is obtained. In effective single-band ratchets, no current rectification occurs. We apply our theory to describe rectification effects in vortex quantum ratchets devices. Current reversals upon variation of the ac-field amplitude or frequency are predicted.en
dc.description.sponsorshipWe thank M. Thorwart, P. Ha?nggi, and J. E. Mooij for useful discussions. Support by FOM is acknowledged.en
dc.format.extent146801en
dc.format.extent148725 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.ispartofseriesPhysical Review Lettersen
dc.relation.ispartofseries89en
dc.relation.ispartofseries14en
dc.rightsYen
dc.subjectPhysicsen
dc.titleQuantum ratchets with few bands below the barrieren
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/ferreirm
dc.identifier.rssinternalid34575
dc.identifier.rssurihttp://dx.doi.org/10.1103/PhysRevLett.89.146801


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