Coulomb gap in one-dimensional disordered electronic systems

Details Coulomb gap in one-dimensional disordered electronic systems Coulomb gap in one-dimensional disordered electronic systems

2003-06-05

arxiv.org/abs/cond-mat/0306127v2

Phys. Rev. B 69 (2004) 132416

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 6 pages, no figures; discussions have been expanded in several places

Scientific paper

10.1103/PhysRevB.69.132416

We study a one-dimensional system of spinless electrons in the presence of a long-range Coulomb interaction (LRCI) and a random chemical potential at each site. We first present a Tomonaga-Luttinger liquid (TLL) description of the system. We use the bosonization technique followed by the replica trick to average over the quenched randomness. An expression for the localization length of the system is then obtained using the renormalization group method and also a physical argument. We then find the density of states for different values of the energy; we get different expressions depending on whether the energy is larger than or smaller than the inverse of the localization length. We work in the limit of weak disorder where the localization length is very large; at that length scale, the LRCI has the effect of reducing the interaction parameter K of the TLL to a value much smaller than the noninteracting value of unity.

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