Coulomb Gaps in One-Dimensional Spin-Polarized Electron Systems

Details Coulomb Gaps in One-Dimensional Spin-Polarized Electron Systems Coulomb Gaps in One-Dimensional Spin-Polarized Electron Systems

1996-08-12

arxiv.org/abs/cond-mat/9608055v1

Physics

Condensed Matter

4 pages, revtex, 4 figures, to be published in Phys. Rev. B as a Rapid Communication

Scientific paper

10.1103/PhysRevB.54.R8341

We investigate the density of states (DOS) near the Fermi energy of one-dimensional spin-polarized electron systems in the quantum regime where the localization length is comparable to or larger than the inter-particle distance. The Wigner lattice gap of such a system, in the presence of weak disorder, can occur precisely at the Fermi energy, coinciding with the Coulomb gap in position. The interplay between the two is investigated by treating the long-range Coulomb interaction and the random disorder potential in a self-consistent Hartree-Fock approximation. The DOS near the Fermi energy is found to be well described by a power law whose exponent decreases with increasing disorder strength.

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