Hartree-Fock based diagonalization: an efficient method for simulating disordered interacting electrons

Details Hartree-Fock based diagonalization: an efficient method for simulating disordered interacting electrons Hartree-Fock based diagonalization: an efficient method for simulating disordered interacting electrons

1998-09-12

arxiv.org/abs/cond-mat/9809171v1

Computer Phys. Commun. 121--122 (1999), 489-92

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 eps figures included, invited talk at Conference on Computational Physics (Granada, Sep 1998)

Scientific paper

10.1016/S0010-4655(99)00388-4

We present an efficient numerical method for simulating the low-energy properties of disordered many-particle systems. The method which is based on the quantum-chemical configuration interaction approach consists in diagonalizing the Hamiltonian in an energetically truncated basis build of the low-energy states of the corresponding Hartree-Fock Hamiltonian. As an example we investigate the quantum Coulomb glass, a model of spinless electrons in a random potential interacting via long-range Coulomb interaction. We find that the Coulomb interaction increases the conductance of strongly disordered systems but reduces the conductance of weakly disordered systems.

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