Projected Wave Functions and High Temperature Superconductivity

Arun Paramekanti, Mohit Randeria, and Nandini Trivedi
Phys. Rev. Lett. 87, 217002 – Published 1 November 2001
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Abstract

We study the Hubbard model with parameters relevant to cuprates using variational Monte Carlo for projected d-wave states. For doping 0<x0.35 we obtain a superconductor whose order parameter Φ(x) tracks the observed nonmonotonic Tc(x). The variational parameter Δvar(x) scales with the (π,0) “hump” and T* 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 Zx though the Fermi velocity remains finite as x0. The Drude weight Dlow and superfluid density are consistent with experiment and DlowZ.

  • Received 9 January 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.217002

©2001 American Physical Society

Authors & Affiliations

Arun Paramekanti, Mohit Randeria, and Nandini Trivedi

  • Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai, 400005 India

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Issue

Vol. 87, Iss. 21 — 19 November 2001

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