| Issue |
Europhys. Lett.
Volume 40, Number 2, October II 1997
|
|
|---|---|---|
| Page(s) | 189 - 194 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00444-0 | |
| Published online | 01 September 2002 | |
Resonant tunneling through a two-level dot and double quantum dots
1
Materials Physics Laboratory,
Helsinki University of Technology, 02150 Espoo, Finland
2
Institut für Theoretische Festkörperphysik, Universität Karlsruhe,
76128 Karlsruhe, Germany
3
Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
Received:
6
June
1997
Accepted:
10
September
1997
We study resonant tunneling through quantum-dot systems in the presence of strong Coulomb repulsion and coupling to the metallic leads. Motivated by recent experiments we concentrate on i) a single dot with two energy levels and ii) a double dot with one level in each dot. Each level is twofold spin-degenerate. Depending on the level spacing these systems are physical realizations of different Kondo-type models. Using a real-time diagrammatic formulation we evaluate the spectral density and the non-linear conductance. The latter shows a novel triple-peak resonant structure.
PACS: 73.40.Gk – Tunneling / 72.15.Qm – Scattering mechanisms and Kondo effect / 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers)
© EDP Sciences, 1997
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