Localization of eigenstates in a modified Tomonaga-Luttinger model

Details Localization of eigenstates in a modified Tomonaga-Luttinger model Localization of eigenstates in a modified Tomonaga-Luttinger model

2000-06-06

arxiv.org/abs/cond-mat/0006091v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

19 pages, 7 figures

Scientific paper

10.1103/PhysRevB.63.045106

We study the localization in the Hilbert space of a modified Tomonaga-Luttinger model. For the standard version of this model, the states are found to be extended in the basis of Slater determinants, representing the eigenstates of the non-interacting system. The linear dispersion which leads to the fact that these eigenstates are extended in the modified model is replaced by one with random level spacings modeling the complicated one-particle spectra of realistic models. The localization properties of the eigenstates are studied. The interactions are simplified and an effective one-dimensional Lloyd model is obtained. The effects of many-body energy correlations are studied numerically. The eigenstates of the system are found to be localized in Fock space for any strength of the interactions, but the localization is not exponential.

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