The energy associated with bosonic and fermionic pairs of topological spin defects in doped antiferromagnetic quantum spin- $1∕2$ square lattice is estimated within a resonating valence bond scenario, as described by a $t\text{\ensuremath{-}}{t}^{\ensuremath{'}}\text{\ensuremath{-}}J$-like model Hamiltonian, plus a ${t}_{\ensuremath{\perp}}$, responsible of a three-dimensional screening of the electrostatic repulsion within the bosonic pairs. For parameters appropriate for monolayered high- ${T}_{c}$ superconductors, both fermionic and bosonic pairs show ${x}^{2}\ensuremath{-}{y}^{2}$ symmetry. We find a critical value of doping such that the energy of the bosonic pairs goes below twice the energy of two fermionic pairs at their Fermi level. This finding could be related to the onset of high- ${T}_{c}$ superconductivity.The energy associated with bosonic and fermionic pairs of topological spin defects in doped antiferromagnetic quantum spin-$1∕2$ square lattice is estimated within a resonating valence bond scenario, as described by a $t\text{\ensuremath{-}}{t}^{\ensuremath{'}}\text{\ensuremath{-}}J$-like model Hamiltonian, plus a ${t}_{\ensuremath{\perp}}$, responsible of a three-dimensional screening of the electrostatic repulsion within the bosonic pairs. For parameters appropriate for monolayered high-${T}_{c}$ superconductors, both fermionic and bosonic pairs show ${x}^{2}\ensuremath{-}{y}^{2}$ symmetry. We find a critical value of doping such that the energy of the bosonic pairs goes below twice the energy of two fermionic pairs at their Fermi level. This finding could be related to the onset of high-${T}_{c}$ superconductivity.

arXiv:cond-mat/0507452Physical Review BJul 18, 20051 citation

Hole pairing in high-T c superconductors: Symmetry-driven configuration interaction mechanism

Michele Cini, A. Balzarotti

Il Nuovo Cimento DJan 1, 199612 citations

Strong-coupling field theory and soliton doping in a one-dimensional copper-oxide model

Victor J. Emery

A field theory for the strong-coupling limit of a one-dimensional copper-oxide model is obtained from a weak-coupling point of view. Complementary aspects of strong correlations and band motion are incorporated in a natural way. Doping induces soliton or antisoliton charge excitations into a state with explicity broken chiral symmetry. The solitons or antisolitons have divergent superconductive pairing-correlation functions and various properties reminiscent of doped holes or electrons in high-temperature superconductors.A field theory for the strong-coupling limit of a one-dimensional copper-oxide model is obtained from a weak-coupling point of view. Complementary aspects of strong correlations and band motion are incorporated in a natural way. Doping induces soliton or antisoliton charge excitations into a state with explicity broken chiral symmetry. The solitons or antisolitons have divergent superconductive pairing-correlation functions and various properties reminiscent of doped holes or electrons in high-temperature superconductors.

Physical Review LettersAug 20, 199037 citations

Electron-Spin Interaction in High-Tc Superconductors

Zhongbing Huang, Werner R. Hanke, Enrico Arrigoni

Springer eBooksNov 17, 20050 citations

Electron correlations in high-Tc superconductors

Sadamichi Maekawa, Y. Ohta

Physica B Condensed MatterFeb 1, 19950 citations

d -wave pairing in lightly doped Mott insulators

Evgeny A. Plekhanov, Federico Becca, Sandro Sorella

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 ${Z}_{c}\ensuremath{\ne}0$. By using a quantum Monte Carlo projection technique for the Hubbard model at $U∕t=4$ , a finite ${Z}_{c}$ , with $d$ -wave symmetry, is found at half filling and in the lightly doped regime, thus emphasizing a qualitatively new feature coming from electronic correlation.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 ${Z}_{c}\ensuremath{\ne}0$. By using a quantum Monte Carlo projection technique for the Hubbard model at $U∕t=4$, a finite ${Z}_{c}$, with $d$-wave symmetry, is found at half filling and in the lightly doped regime, thus emphasizing a qualitatively new feature coming from electronic correlation.

arXiv:cond-mat/0404206Physical Review BFeb 23, 200514 citations

The energy associated with bosonic and fermionic pairs of topological spin defects in doped antiferromagnetic quantum spin-

1∕2

square lattice is estimated within a resonating valence bond scenario, as described by a $t\text{\ensuremath{-}}{t}^{\ensuremath{'}}\text{\ensuremath{-}}J$-like model Hamiltonian, plus a ${t}_{\ensuremath{\perp}}$, responsible of a three-dimensional screening of the electrostatic repulsion within the bosonic pairs. For parameters appropriate for monolayered high-

{T}_{c}

superconductors, both fermionic and bosonic pairs show ${x}^{2}\ensuremath{-}{y}^{2}$ symmetry. We find a critical value of doping such that the energy of the bosonic pairs goes below twice the energy of two fermionic pairs at their Fermi level. This finding could be related to the onset of high-

{T}_{c}

superconductivity.

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 ${Z}_{c}\ensuremath{\ne}0$. By using a quantum Monte Carlo projection technique for the Hubbard model at

U∕t=4

, a finite

{Z}_{c}

, with

d

-wave symmetry, is found at half filling and in the lightly doped regime, thus emphasizing a qualitatively new feature coming from electronic correlation.