Transmission through a Quantum Dot with Two Orbitals

Transmission coefficient through a quantum dot, which contains two orbitals, is calculated in the weak-tunneling regime, taking into account the Coulomb interaction within the dot. Transmitted waves through these orbitals acquire phase shifts which differ by π from each other in the present model. T...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2001-03, Vol.40 (3S), p.1963
Main Authors: Wataru Izumida, Wataru Izumida, Hiroshi Akera, Hiroshi Akera
Format: Article
Language:English
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Summary:Transmission coefficient through a quantum dot, which contains two orbitals, is calculated in the weak-tunneling regime, taking into account the Coulomb interaction within the dot. Transmitted waves through these orbitals acquire phase shifts which differ by π from each other in the present model. The transmission coefficient as a function of gate voltage exhibits symmetric and asymmetric line shapes, depending on temperature T . A nearly symmetric line shape appears in the temperature region of 0.05 \lesssim k B T /δ\lesssim0.25, where δ is the single-particle energy level separation in the dot. This behavior is understood by a combined action of the above-mentioned phase difference and the Coulomb interaction. A possibility that this mechanism explains the recent experiment is suggested.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.40.1963