Abstract
We study the Hubbard model with parameters relevant to cuprates using variational Monte Carlo for projected -wave states. For doping we obtain a superconductor whose order parameter tracks the observed nonmonotonic . The variational parameter scales with the “hump” and seen in photoemission. Projection leads to incoherence in the spectral function and from the singular behavior of its moments we obtain the nodal quasiparticle weight though the Fermi velocity remains finite as . The Drude weight and superfluid density are consistent with experiment and .
- Received 9 January 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.217002
©2001 American Physical Society