Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-12-05
J. Phys.: Condens. Matter 20, 315207 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1088/0953-8984/20/31/315207
Theory of electronic transport through a triangular triple quantum dot subject to a perpendicular magnetic field is developed using a tight binding model. We show that magnetic field allows to engineer degeneracies in the triple quantum dot energy spectrum. The degeneracies lead to zero electronic transmission and sharp dips in the current whenever a pair of degenerate states lies between the chemical potential of the two leads. These dips can occur with a periodicity of one flux quantum if only two levels contribute to the current or with half flux quantum if the three levels of the triple dot contribute. The effect of strong bias voltage and different lead-to-dot connections on Aharonov-Bohm oscillations in the conductance is also discussed.
Delgado Felix
Hawrylak Pawel
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