Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-10-22
Physics
Condensed Matter
Strongly Correlated Electrons
To appear on Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.81.5185
We have studied the t-J model using the Green Function Monte Carlo technique. We have obtained accurate energies well converged in the thermodynamic limit, by performing simulations up to 242 lattice sites. By studying the energy as a function of hole doping we conclude that there is no phase separation in the physical region, relevant for HTc superconductors. This finding is further supported by the hole-hole correlation function calculation. Remarkably, by approaching the phase separation instability, for $J_c/t\sim 0.5$,this function displays enhanced fluctuations at incommensurate wavevectors, scaling linearly with the doping, in agreement with experimental findings.
Becca Federico
Calandra Matteo
Sorella Sandro
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