Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-06-21
Phys. Rev. B 72, 045305 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted for publication in Phys Rev B
Scientific paper
10.1103/PhysRevB.72.045305
Despite considerable work on the energy-level and wavefunction statistics of disordered quantum systems, numerical studies of those statistics relevant for electron-electron interactions in mesoscopic systems have been lacking. We plug this gap by using a tight-binding model to study a wide variety of statistics for the two-dimensional, disordered quantum system in the diffusive regime. Our results are in good agreement with random matrix theory (or its extensions) for simple statistics such as the probability distribution of energy levels or spatial correlation of a wavefunction. However, we see substantial disagreement in several statistics which involve both integrating over space and different energy levels, indicating that disordered systems are more complex than previously thought. These are exactly the quantities relevant to electron-electron interaction effects in quantum dots; in fact, we apply these results to the Coulomb blockade, where we find altered spacings between conductance peaks and wider spin distributions than traditionally expected.
Baranger Harold U.
Miller Mike
Ullmo Denis
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