Localization properties of a one-dimensional tight-binding model with non-random long-range inter-site interactions

Details Localization properties of a one-dimensional tight-binding model with non-random long-range inter-site interactions Localization properties of a one-dimensional tight-binding model with non-random long-range inter-site interactions

2004-12-23

arxiv.org/abs/cond-mat/0412669v2

Phys. Rev. B 71 (2005) 174203

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 6 postscript figures, uses revtex4

Scientific paper

10.1103/PhysRevB.71.174203

We perform both analytical and numerical studies of the one-dimensional tight-binding Hamiltonian with stochastic uncorrelated on-site energies and non-fluctuating long-range hopping integrals . It was argued recently [A. Rodriguez at al., J. Phys. A: Math. Gen. 33, L161 (2000)] that this model reveals a localization-delocalization transition with respect to the disorder magnitude provided . The transition occurs at one of the band edges (the upper one for and the lower one for). The states at the other band edge are always localized, which hints on the existence of a single mobility edge. We analyze the mobility edge and show that, although the number of delocalized states tends to infinity, they form a set of null measure in the thermodynamic limit, i.e. the mobility edge tends to the band edge. The critical magnitude of disorder for the band edge states is computed versus the interaction exponent by making use of the conjecture on the universality of the normalized participation number distribution at transition.

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