Multi-band quantum ratchets

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dc.creatorGrifoni, M.
dc.creatorFerreira, M. S.
dc.creatorPeguiron, J.
dc.creatorMajer, J. B.
dc.date2002-08-28
dc.date.accessioned2026-07-07T08:05:24Z
dc.date.available2026-07-07T08:05:24Z
dc.descriptionWe investigate directed motion in non-adiabatically 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 intra- and inter-well 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.
dc.descriptionAccepted for publication in Physical Review Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/0208549
dc.identifierhttp://arxiv.org/abs/cond-mat/0208549
dc.identifierPhys. Rev. Lett. 89, 146801 (2002)
dc.identifierdoi:10.1103/PhysRevLett.89.146801
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/130273
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStatistical Mechanics
dc.titleMulti-band quantum ratchets
dc.typetext

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