TY - JOUR
T1 - Noncollinear magnetoconductance of a quantum dot
AU - Pedersen, Jonas Nyvold
AU - Thomassen, Jesper Q.
AU - Flensberg, Karsten
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevB.72.045341
DO - 10.1103/PhysRevB.72.045341
M3 - Journal article
VL - 72
SP - 045341
JO - Physical Review B (Condensed Matter and Materials Physics)
JF - Physical Review B (Condensed Matter and Materials Physics)
SN - 1098-0121
ER -