Projected Wave Functions and High Temperature Superconductivity

2001/01/31 by Arun Paramekanti, Mohit Randeria, Nandini Trivedi · 3 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum many-body systems #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.87.217002

4 pages, 5 EPS figures. (1) Many improvements including discussion of n(k) and superfluid density. (2) Added comparison with slave boson mean field theory. (3) Added new references

arxiv created 2001/03/30 · openalex publication_date 2001/11/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We study the Hubbard model with parameters relevant to cuprates using variational Monte Carlo for projected d-wave states. For doping 0<x approximately less than or equal to 0.35 we obtain a superconductor whose order parameter Phi(x) tracks the observed nonmonotonic T(c)(x). The variational parameter Delta(var)(x) scales with the (pi,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 Z approximately x though the Fermi velocity remains finite as x-->0. The Drude weight D(low) and superfluid density are consistent with experiment and D(low) approximately Z.

Citations

• Phase fluctuations, dissipation, and superfluid stiffness ind-wave superconductors
• Unusual Superconducting State of Underdoped Cuprates
• Electronic Spectra and Their Relation to the(π,π)Collective Mode in High-TcSuperconductors

Cited by

• Pseudogap and competing states in underdoped cuprates
• Particle number renormalization in nearly half-filled Mott Hubbard superconductors
• Variational Monte Carlo studies of a t–J model on an anisotropic triangular lattice