d-wave pairing in lightly doped Mott insulators

Abstract

We define a suitable quantity $Z_c$ that measures the pairing strength of two electrons added to the ground state wave function by means of the anomalous part of the one-particle Green's function. $Z_c$ discriminates between systems described by one-electron states, like ordinary metals and band insulators, for which $Z_c=0$, and systems where the single particle picture does not hold, like superconductors and resonating valence bond insulators, for which $Z_c\ne 0$. By using a numerically exact projection technique for the Hubbard model at $U/t=4$, a finite value of $Z_c$, with d-wave symmetrry, is found at half filling and in the lightly doped regime, thus emphasizing a qualitatively new feature coming from electronic correlation.

arXiv comment4 pages, 4 figures

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• Many-body renormalisation of forces in f-electron materials
• Calculating DMFT forces in ab-initio ultrasoft pseudopotential formalism
• Time-dependent Gutzwiller theory of pairing fluctuations in the Hubbard model
• Resonating Valence Bond wave function: from lattice models to realistic systems