Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot

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 o...

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Publicado: 2007
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v76_n8_p_AguiarHualde
http://hdl.handle.net/20.500.12110/paper_10980121_v76_n8_p_AguiarHualde
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_10980121_v76_n8_p_AguiarHualde2023-06-08T16:07:38Z Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot 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. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v76_n8_p_AguiarHualde http://hdl.handle.net/20.500.12110/paper_10980121_v76_n8_p_AguiarHualde
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
title Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
spellingShingle Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
title_short Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
title_full Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
title_fullStr Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
title_full_unstemmed Effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
title_sort effects of the electron-electron interaction on electronic transport through the antibonding orbital of a longitudinally embedded double quantum dot
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v76_n8_p_AguiarHualde
http://hdl.handle.net/20.500.12110/paper_10980121_v76_n8_p_AguiarHualde
_version_ 1768545430190161920

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