Volume 40, Number 2, October II 1997
|Page(s)||189 - 194|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Resonant tunneling through a two-level dot and double quantum dots
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
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.