Volume 81, Number 3, February 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 December 2007|
Tunable transmission via quantum state evolution in oval quantum dots
Theoretische Chemie, University of Heidelberg - INF 229, 69120 Heidelberg, Germany
2 Tyndall National Institute, Lee Maltings - Prospect Row, Cork, Ireland
3 Physikalisches Institut, University of Heidelberg - Philosophenweg 12, 69120 Heidelberg, Germany
Accepted: 21 November 2007
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.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 73.23.Ad – Ballistic transport / 75.47.Jn – Ballistic magnetoresistance
© EPLA, 2008
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