Volume 68, Number 2, October 2004
|Page(s)||261 - 267|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2004|
Spin splitting in open quantum dots
Department of Science and Technology (ITN), Linköping University 601 74 Norrköping, Sweden
2 Institute for Microstructural Science, National Research Council K1A 0R6, Ottawa, Canada
Accepted: 19 August 2004
We demonstrate that the magnetoconductance of small lateral quantum dots in the strongly coupled regime (i.e. when the leads can support one or more propagating modes) shows a pronounced splitting of the conductance peaks and dips which persists over a wide range of magnetic fields (from zero field to the edge-state regime) and is virtually independent of the magnetic field strength. Our numerical analysis of the conductance based on the Hubbard Hamiltonian demonstrates that this is essentially a many-body/spin effect that can be traced to a splitting of degenerate levels in the corresponding closed dot. The above effect in open dots can be regarded as a counterpart of the Coulomb-blockade effect in weakly coupled dots, with the difference, however, that the splitting of the peaks originates from interactions between electrons of opposite spin.
PACS: 73.23.Ad – Ballistic transport / 73.21.La – Quantum dots / 72.25.Dc – Spin polarized transport in semiconductors
© EDP Sciences, 2004
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