Quantum ratchets with few bands below the barrier
Citation:
Grifoni, 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 - 146801-4Download Item:
Abstract:
We 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.
Author's Homepage:
http://people.tcd.ie/ferreirmDescription:
PUBLISHED
Author: FERREIRA, MAURO
Publisher:
American Physical SocietyType of material:
Journal ArticleCollections
Series/Report no:
Physical Review Letters89
14
Availability:
Full text availableKeywords:
PhysicsISSN:
0031-9007Metadata
Show full item recordLicences: