Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2008-07-22
Phys. Rev. Lett. 101, 226803 (2008)
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages 4 figures
Scientific paper
10.1103/PhysRevLett.101.226803
Using a combination of ground state quantum Monte-Carlo and finite size scaling techniques, we perform a systematic study of the effect of Coulomb interaction on the localisation length of a disordered two-dimensional electron gas. We find that correlations delocalise the 2D system. In the absence of valley degeneracy (as in GaAs heterostructures), this delocalization effect corresponds to a finite increase of the localization length. The delocalisation is much more dramatic in the presence of valley degeneracy (as in Si MOSFETSs) where the localization length increases drastically. Our results suggest that a rather simple mechanism can account for the main features of the metallic behaviour observed in high mobility Si MOSFETs. Our findings support the claim that this behaviour is indeed a genuine effect of the presence of electron-electron interactions, yet that the system is not a ``true'' metal in the thermodynamic sense.
Fleury Geneviève
Waintal Xavier
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