IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
Generalized multi-terminal decoherent transport: recursive algorithms and applications to SASER and giant magnetoresistance
Autor/es:
CARLOS CATTENA; LUCAS J. FERNÁNDEZ; RAÚL BUSTOS-MARÚN; DAIJIRO NOZAKI; HORACIO M. PASTAWSKI
Revista:
JOURNAL OF PHYSICS CONDENSED MATTER
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2014 vol. 26 p. 345304 - 345320
ISSN:
0953-8984
Resumen:
J. Phys.: Condens. Matter 26 (2014) 345304 (14pp) doi:10.1088/0953-8984/26/34/345304Generalized multi-terminal decoherent transport: recursive algorithms and applications to SASER and giant magnetoresistanceCarlos J Cattena, Lucas J Fernández-Alcázar, Raúl A Bustos-Marún, Daijiro Nozaki and Horacio M PastawskiAbstractDecoherent transport in mesoscopic and nanoscopic systems can be formulated in terms of the D´Amato-Pastawski (DP) model. This generalizes the Landauer-Büttiker picture byconsidering a distribution of local decoherent processes. However, its generalization formulti-terminal set-ups is lacking. We first review the original two-terminal DP model fordecoherent transport. Then, we extend it to a matrix formulation capable of dealing withmulti-terminal problems. We also introduce recursive algorithms to evaluate the Green?sfunctions for general banded Hamiltonians as well as local density of states, effectiveconductances and voltage profiles. We finally illustrate the method by analyzing two problems of current relevance. (1) Assessing the role of decoherence in a model for phonon lasers (SASER). (2) Obtaining the classical limit of giant magnetoresistance from a spin-dependent Hamiltonian. The presented methods should pave the way for computationally demanding calculations of transport through nanodevices,