Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-04-07
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
17 pages,8 figures,Revtex,submitted to Physical Review B
Scientific paper
10.1103/PhysRevB.63.045301
We investigate the transport properties of quantum dots placed in strong magnetic field using a quantum-mechanical ' approach based on the 2D tight-binding Hamiltonian with direct Coulomb interaction and the Landauer-B\"{u}ttiker (LB) formalism. The electronic transmittance and the Hall resistance show Coulomb oscillations and also prove multiple addition processes. We identify this feature as the 'bunching' of electrons observed in recent experiments and give an elementary explanation in terms of spectral characteristics of the dot. The spatial distribution of the added electrons may distinguish between edge and bulk states and it has specific features for bunched electrons. The dependence of the charging energy on the number of electrons is discussed for strong and vanishing magnetic field. The crossover from the tunneling to quantum Hall regime is analyzed in terms of dot-lead coupling.
Aldea Alexandru
Manolescu Andrei
Moldoveanu Valeriu
Nita Marian
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