Do interactions increase or reduce the conductance of disordered electrons? It depends!

Details Do interactions increase or reduce the conductance of disordered electrons? It depends! Do interactions increase or reduce the conductance of disordered electrons? It depends!

1998-06-16

arxiv.org/abs/cond-mat/9806194v2

Phys. Rev. Lett. 81, 4212 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

final version as publsihed, 4 pages REVTEX, 6 EPS figures included

Scientific paper

10.1103/PhysRevLett.81.4212

We investigate the influence of electron-electron interactions on the conductance of two-dimensional disordered spinless electrons. By using an efficient numerical method which is based on exact diagonalization in a truncated basis of Hartree-Fock states we are able to determine the exact low-energy properties of comparatively large systems in the diffusive as well as in the localized regimes. We find that weak interactions increase the d.c. conductance in the localized regime while they decrease the d.c. conductance in the diffusive regime. Strong interactions always decrease the conductance. We also study the localization of single-particle excitations close to the Fermi energy which turns out to be only weakly influenced by the interactions.

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