Details
| Original language | English |
|---|---|
| Article number | 115308 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 70 |
| Issue number | 11 |
| Publication status | Published - 14 Sept 2004 |
Abstract
We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an external potential consisting of a parabolic confinement and a negatively charged Coulombic impurity placed in the vicinity of the quantum dot. The model leads to good agreement between the calculated single-electron eigenenergies and the experimental spectrum. Furthermore, we use the spin-density-functional theory to study the energies and angular momenta when the system contains many interacting electrons. In the high magnetic field regime the increasing electron number is shown to reduce the distortion induced by the impurity.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 11, 115308, 14.09.2004.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Impurity effects in quantum dots
T2 - Toward quantitative modeling
AU - Räsänen, E.
AU - Könemann, J.
AU - Haug, R. J.
AU - Puska, M. J.
AU - Nieminen, R. M.
N1 - Funding information: This research was supported by the Academy of Finland through its Centers of Excellence program (2000–2005). E.R. is also grateful for the Magnus Ehrnrooth Foundation for financial support and A. Harju and A. D. Güçlü for useful discussions. The group in Hannover acknowledges sample growth by V. Avrutin and A. Waag and financial support by BMBF.
PY - 2004/9/14
Y1 - 2004/9/14
N2 - We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an external potential consisting of a parabolic confinement and a negatively charged Coulombic impurity placed in the vicinity of the quantum dot. The model leads to good agreement between the calculated single-electron eigenenergies and the experimental spectrum. Furthermore, we use the spin-density-functional theory to study the energies and angular momenta when the system contains many interacting electrons. In the high magnetic field regime the increasing electron number is shown to reduce the distortion induced by the impurity.
AB - We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an external potential consisting of a parabolic confinement and a negatively charged Coulombic impurity placed in the vicinity of the quantum dot. The model leads to good agreement between the calculated single-electron eigenenergies and the experimental spectrum. Furthermore, we use the spin-density-functional theory to study the energies and angular momenta when the system contains many interacting electrons. In the high magnetic field regime the increasing electron number is shown to reduce the distortion induced by the impurity.
UR - http://www.scopus.com/inward/record.url?scp=19744382636&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.70.115308
DO - 10.1103/PhysRevB.70.115308
M3 - Article
AN - SCOPUS:19744382636
VL - 70
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 11
M1 - 115308
ER -