Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-09-14
Phys. Rev. Lett., Vol 95, 027001 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, the final version published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.95.027001
By explicitly computing wavefunction overlap via exact diagonalization in finite systems, we provide evidence indicating that, in the limit of strong coupling, i.e., $\Delta/t \to \infty$, the ground state of the Gutzwiller-projected BCS Hamiltonian (accompanied by proper particle-number projection) is identical to the exact ground state of the 2D antiferromagnetic Heisenberg model on the square lattice. This identity is adiabatically connected to a very high overlap between the ground states of the projected BCS Hamiltonian and the t-J model at moderate doping.
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