Spontaneous deformation of the Fermi surface due to strong correlation in the two-dimensional t-J model

Details Spontaneous deformation of the Fermi surface due to strong correlation in the two-dimensional t-J model Spontaneous deformation of the Fermi surface due to strong correlation in the two-dimensional t-J model

2000-03-16

arxiv.org/abs/cond-mat/0003278v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 eps figures, revtex

Scientific paper

10.1103/PhysRevLett.85.4345

Fermi surface of the two-dimensional t-J model is studied using the variational Monte Carlo method. We study the Gutzwiller projected d-wave superconducting state with an additional variational parameter t'_v corresponding to the next-nearest neighbor hopping term. It is found that the finite t'_v<0 gives the lowest variational energy in the wide range of hole-doping rates. The obtained momentum distribution function shows that the Fermi surface deforms spontaneously. It is also shown that the van Hove singularity is always located very close to the Fermi energy. Using the Gutzwiller approximation, we show that this spontaneous deformation is due to the Gutzwiller projection operator or the strong correlation.

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