Landau mapping and Fermi liquid parameters of the 2D t-J model

Details Landau mapping and Fermi liquid parameters of the 2D t-J model Landau mapping and Fermi liquid parameters of the 2D t-J model

1997-06-06

arxiv.org/abs/cond-mat/9706060v1

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex file, 5 pages with 5 embedded eps-files, hardcopies of figures (or the entire manuscript) can be obtained by e-mail req

Scientific paper

10.1103/PhysRevB.57.R5590

We study the momentum distribution function n(k) in the 2D t-J model on small clusters by exact diagonalization. We show that n(k) can be decomposed systematically into two components with Bosonic and Fermionic doping dependence. The Bosonic component originates from the incoherent motion of holes and has no significance for the low energy physics. For the Fermionic component we exlicitely perform the one-to-one Landau mapping between the low lying eigenstates of the t-J model clusters and those of an equivalent system of spin-1/2 quasiparticles. This mapping allows to extract the quasiparticle dispersion, statistics, and Landau parameters. The results show conclusively that the 2D t-J model for small doping is a Fermi liquid with a `small' Fermi surface and a moderately strong attractive interaction between the quasiparticles.

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