Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 31, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/31/315207
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A theory of electronic transport through an empty triangular triple quantum dot subject to a perpendicular magnetic field is developed using a tight-binding model and Landauer-Buttiker approach. We show that a magnetic field allows one to engineer degeneracies in the energy spectrum of the triple quantum dot. The degeneracies lead to zero electronic transmission and sharp dips in the current whenever a pair of degenerate states lies between the chemical potentials 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 a 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.
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