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Noncollinear magnetoconductance of a quantum dot

Pedersen, Jonas LU ; Thomassen, Jesper and Flensberg, Karsten (2005) In Physical Review B. Condensed Matter and Materials Physics 72.
Abstract
We study theoretically the linear conductance of a quantum dot connected to ferromagnetic leads. The dot level is split due to a noncollinear magnetic field or intrinsic magnetization. The system is studied in the noninteracting approximation, where an exact solution is given, and, furthermore, with Coulomb correlations in the weak tunneling limit. For the noninteracting case, we find an antiresonance for a particular direction of the applied field, noncollinear to the parallel magnetization directions of the leads. The antiresonance is destroyed by the correlations, giving rise to an interaction induced enhancement of the conductance. The angular dependence of the conductance is thus distinctly different for the interacting and... (More)
We study theoretically the linear conductance of a quantum dot connected to ferromagnetic leads. The dot level is split due to a noncollinear magnetic field or intrinsic magnetization. The system is studied in the noninteracting approximation, where an exact solution is given, and, furthermore, with Coulomb correlations in the weak tunneling limit. For the noninteracting case, we find an antiresonance for a particular direction of the applied field, noncollinear to the parallel magnetization directions of the leads. The antiresonance is destroyed by the correlations, giving rise to an interaction induced enhancement of the conductance. The angular dependence of the conductance is thus distinctly different for the interacting and noninteracting cases when the magnetizations of the leads are parallel. However, for antiparallel lead magnetizations, the interactions do not alter the angle dependence significantly. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Physical Review B. Condensed Matter and Materials Physics
volume
72
publisher
American Physical Society
external identifiers
  • WOS:000230890300124
  • Scopus:33749233609
DOI
10.1103/PhysRevB.72.045341
language
English
LU publication?
yes
id
18097a46-a54e-4516-8864-1239f1aa96b2 (old id 644227)
date added to LUP
2007-12-03 16:40:47
date last changed
2017-01-01 08:00:11
@article{18097a46-a54e-4516-8864-1239f1aa96b2,
  abstract     = {We study theoretically the linear conductance of a quantum dot connected to ferromagnetic leads. The dot level is split due to a noncollinear magnetic field or intrinsic magnetization. The system is studied in the noninteracting approximation, where an exact solution is given, and, furthermore, with Coulomb correlations in the weak tunneling limit. For the noninteracting case, we find an antiresonance for a particular direction of the applied field, noncollinear to the parallel magnetization directions of the leads. The antiresonance is destroyed by the correlations, giving rise to an interaction induced enhancement of the conductance. The angular dependence of the conductance is thus distinctly different for the interacting and noninteracting cases when the magnetizations of the leads are parallel. However, for antiparallel lead magnetizations, the interactions do not alter the angle dependence significantly.},
  articleno    = {045341},
  author       = {Pedersen, Jonas and Thomassen, Jesper and Flensberg, Karsten},
  language     = {eng},
  publisher    = {American Physical Society},
  series       = {Physical Review B. Condensed Matter and Materials Physics},
  title        = {Noncollinear magnetoconductance of a quantum dot},
  url          = {http://dx.doi.org/10.1103/PhysRevB.72.045341},
  volume       = {72},
  year         = {2005},
}