Spin splitting in open quantum dots
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 edgestate 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 manybody/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 Coulombblockade effect in weakly coupled dots, with the difference, however, that the splitting of the peaks originates from interactions between electrons of opposite spin.
 Publication:

EPL (Europhysics Letters)
 Pub Date:
 October 2004
 DOI:
 10.1209/epl/i2004101892
 arXiv:
 arXiv:condmat/0306327
 Bibcode:
 2004EL.....68..261E
 Keywords:

 Condensed Matter  Mesoscopic Systems and Quantum Hall Effect
 EPrint:
 4 pages, 4 figures 1 misdirected figure reference corrected mismatch between spinup/spindown notation in figure 34 and discussion corrected, clarifications in text added