Tunable transmission via quantum state evolution in oval quantum dots

Abstract

We explore the quantum transmission through open oval shaped quantum dots. The transmission spectra show periodic resonances and, depending on the geometry parameter, a strong suppression of the transmission for low energies. Applying a weak perpendicular magnetic field changes this situation drastically and introduces a large conductance. We identify the underlying mechanisms being partially due to the specific shape of the oval that causes a systematic decoupling of a substantial number of states from the leads. Importantly a pairwise destructive interference of the transmitting states is encountered thereby leading to the complete conductance suppression. Coupling properties and interferences can be tuned via a weak magnetic field. These properties are robust with respect to the presence of disorder in the quantum dot.

5 pages, 3 figures, accepted for publication in EPL

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Cited by in corpus (3)

• Magnetoconductance switching in an array of oval quantum dots
• Magnetic field-induced control of transport in multiterminal focusing quantum billiards
• Current control by resonance decoupling and magnetic focusing in soft-wall billiards