Tunable transmission via quantum state evolution in oval quantum dots

Details Tunable transmission via quantum state evolution in oval quantum dots Tunable transmission via quantum state evolution in oval quantum dots

2007-12-05

arxiv.org/abs/0712.0682v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, accepted for publication in EPL

Scientific paper

10.1209/0295-5075/81/37001

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.

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