| 1. |
- Evaldsson, Martin, 1977-, et al.
(författare)
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Spin Splitting in open quantum dots
- 2005
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Ingår i: International Conference on the Physics of Semiconductors,2004. - Melville, New York : American Institute of Physics. ; , s. 1413-
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Konferensbidrag (refereegranskat)
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| 2. |
- Evaldsson, Martin, et al.
(författare)
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Spin splitting in open quantum dots
- 2004
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Ingår i: Europhysics letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 68:2, s. 261-267
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 3. |
- Zozoulenko, Igor, et al.
(författare)
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Magnetoconductance of a few-electron open quantum dot
- 2000
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Ingår i: Physica. E, Low-Dimensional systems and nanostructures. - 1386-9477 .- 1873-1759. ; 6:1, s. 409-413
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Tidskriftsartikel (refereegranskat)abstract
- Magnetoconductance of a small open lateral dot is studied both theoretically and experimentally for the conditions when the dot contains down to approximately 15 electrons. We confirm the existence of a new regime for open dots in which the transport through the structure occurs through individual eigenstates of the corresponding closed dot. In particular, at low magnetic fields the characteristic features in the conductance are related to the underlying eigenspectrum shells. When the number of modes in the leads is reduced more detailed structures within the shells due to single eigenlevels becomes discernible. At higher fields Landau level condensation is evident as well as the crossing of levels collapsing to the different Landau levels.
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