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Abstract:

The effects of the on-site electron-electron (e-e) interaction U on the electronic transport across two longitudinally embedded quantum dots in the regime in which the antibonding (AB) state of the isolated composite system is aligned with the Fermi level at the leads are investigated. This regime occurs when the dot orbital energy d is negative and equal in magnitude to the hopping probability between the orbitals on the two dots. In the noninteracting case, the conductance approaches asymptotically the conductance quantum G0 =2 e2 h as d decreases; in addition, the contribution of the AB channel to the conductance tends to 1. As shown here, this picture is substantially modified by the e-e interaction. For finite U, the conductance versus d shows a maximum at which the value G0 is reached, being supported in this case by the two channels (bonding and antibonding); the relative weight of each channel depends on the actual value of the e-e interaction. In the limit d =-, the conductance is supported only by the AB channel (as in the noninteracting case), but it is always smaller than G0. While the mechanism underlying these results is mainly one body for small U, the Kondo effect and quantum interference come into play at large U. The effects of the e-e interaction increase significantly as the leads-dots coupling decreases, in particular, the range over which the conductance is non-negligible is significantly narrowed. The possible implications on a physically related system, a hydrogen molecule longitudinally bridging two Pt electrodes, are discussed. © 2007 The American Physical Society.

Registro:

Documento: Artículo
Título:Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
Autor:Aguiar-Hualde, J.M.; Chiappe, G.; Louis, E.
Filiación:Departamento de Física J.J. Giambiagi, Facultad de Ciencias Exactas, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Física Aplicada, Instituto Universitario de Materiales, Universidad de Alicante, San Vicente del Raspeig, Alicante 03690, Spain
Año:2007
Volumen:76
Número:8
DOI: http://dx.doi.org/10.1103/PhysRevB.76.085314
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v76_n8_p_AguiarHualde

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Citas:

---------- APA ----------
Aguiar-Hualde, J.M., Chiappe, G. & Louis, E. (2007) . Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot. Physical Review B - Condensed Matter and Materials Physics, 76(8).
http://dx.doi.org/10.1103/PhysRevB.76.085314
---------- CHICAGO ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E. "Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot" . Physical Review B - Condensed Matter and Materials Physics 76, no. 8 (2007).
http://dx.doi.org/10.1103/PhysRevB.76.085314
---------- MLA ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E. "Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot" . Physical Review B - Condensed Matter and Materials Physics, vol. 76, no. 8, 2007.
http://dx.doi.org/10.1103/PhysRevB.76.085314
---------- VANCOUVER ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E. Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot. Phys. Rev. B Condens. Matter Mater. Phys. 2007;76(8).
http://dx.doi.org/10.1103/PhysRevB.76.085314