Dresden 2003 – scientific programme
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HL: Halbleiterphysik
HL 49: Poster II
HL 49.41: Poster
Thursday, March 27, 2003, 16:30–19:00, HSZ/P2
Backscattered Orbits in an Open Quantum Dot — •Roland Brunner1, Ronald Meisels1, Friedemar Kuchar1, Koji Ishibashi2, and Yoshinobu Aoyagi2 — 1Department of Physics, University of Leoben, Austria — 2Semiconducter Laboratory, RIKEN, Saitama, Japan
We perform magneto-resistance measurements on AlGaAs/GaAs quantum dots and observe a series of resistance maxima at low magnetic fields. In a model calculation using a parabolic anisotropic confinement potential (soft-wall) we demonstrate that these peaks may be associated with backscattered orbits. We compare our soft-wall calculations with those using a hard-wall potential [1]. While both models yield the same position of the two-reflections trajectory, the positions for the trajectories with more than two reflections differ. The experimental results agree significantly better with the soft-wall results, thus supporting this kind of confinement for open dots defined by split gate structures.
[1] Lin LH, Aoki N, Nakao K, Ishibashi K, Aoyagi Y et al., Physica E 7 750 (2000)
This work was supported by the Fonds zur Förderung der wissenschaftlichen Forschung", Austria (project P15513).