Pseudogap and superconductivity in two-dimensional doped charge-transfer insulators. / Fratino, Lorenzo; Semon, P.; Sordi, Giovanni; Tremblay, A. -M. S.

In: Physical Review B, Vol. 93, No. 24 , 245147, 24.06.2016, p. 1-6.

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Pseudogap and superconductivity in two-dimensional doped charge-transfer insulators. / Fratino, Lorenzo; Semon, P.; Sordi, Giovanni; Tremblay, A. -M. S.

In: Physical Review B, Vol. 93, No. 24 , 245147, 24.06.2016, p. 1-6.

Research output: Contribution to journalArticlepeer-review

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Fratino, Lorenzo ; Semon, P. ; Sordi, Giovanni ; Tremblay, A. -M. S. / Pseudogap and superconductivity in two-dimensional doped charge-transfer insulators. In: Physical Review B. 2016 ; Vol. 93, No. 24 . pp. 1-6.

BibTeX

@article{b24f74bb102a45dbb7ba70a9d197ea1d,
title = "Pseudogap and superconductivity in two-dimensional doped charge-transfer insulators",
abstract = "High-temperature superconductivity emerges upon doping a state of matter that is insulating because of interactions. A widely studied model considers one orbital per CuO2 unit cell on a square lattice with a strong intraorbital repulsion that leads to a so-called Mott-Hubbard insulator. Here we solve a model that takes into account, within each unit cell, two oxygen orbitals where there is no electron-electron repulsion and a copper orbital with strong electron-electron repulsion. The insulating phase is a so-called charge-transfer insulator, not a Mott-Hubbard insulator. Using cluster dynamical mean-field theory with continuous-time quantum Monte Carlo as an impurity solver and 12 atoms per cluster, we report the normal and superconducting phase diagram of this model as a function of doping, interaction strength, and temperature. As expected, the three-orbital model is consistent with the experimental observation that doped holes are located predominantly on oxygens, a result that goes beyond the one-orbital model. Nevertheless, the phase boundary between pseudogap and correlated metal, the Widom line, and the origin of the pairing energy (kinetic vs potential) are similar to the one-orbital model, demonstrating that these are emergent phenomena characteristic of doped Mott insulators, independently of many microscopic details. Broader implications are discussed.",
author = "Lorenzo Fratino and P. Semon and Giovanni Sordi and Tremblay, {A. -M. S.}",
year = "2016",
month = jun,
day = "24",
doi = "10.1103/PhysRevB.93.245147",
language = "English",
volume = "93",
pages = "1--6",
journal = "Physical Review B",
issn = "1098-0121",
publisher = "American Physical Society",
number = "24 ",

}

RIS

TY - JOUR

T1 - Pseudogap and superconductivity in two-dimensional doped charge-transfer insulators

AU - Fratino, Lorenzo

AU - Semon, P.

AU - Sordi, Giovanni

AU - Tremblay, A. -M. S.

PY - 2016/6/24

Y1 - 2016/6/24

N2 - High-temperature superconductivity emerges upon doping a state of matter that is insulating because of interactions. A widely studied model considers one orbital per CuO2 unit cell on a square lattice with a strong intraorbital repulsion that leads to a so-called Mott-Hubbard insulator. Here we solve a model that takes into account, within each unit cell, two oxygen orbitals where there is no electron-electron repulsion and a copper orbital with strong electron-electron repulsion. The insulating phase is a so-called charge-transfer insulator, not a Mott-Hubbard insulator. Using cluster dynamical mean-field theory with continuous-time quantum Monte Carlo as an impurity solver and 12 atoms per cluster, we report the normal and superconducting phase diagram of this model as a function of doping, interaction strength, and temperature. As expected, the three-orbital model is consistent with the experimental observation that doped holes are located predominantly on oxygens, a result that goes beyond the one-orbital model. Nevertheless, the phase boundary between pseudogap and correlated metal, the Widom line, and the origin of the pairing energy (kinetic vs potential) are similar to the one-orbital model, demonstrating that these are emergent phenomena characteristic of doped Mott insulators, independently of many microscopic details. Broader implications are discussed.

AB - High-temperature superconductivity emerges upon doping a state of matter that is insulating because of interactions. A widely studied model considers one orbital per CuO2 unit cell on a square lattice with a strong intraorbital repulsion that leads to a so-called Mott-Hubbard insulator. Here we solve a model that takes into account, within each unit cell, two oxygen orbitals where there is no electron-electron repulsion and a copper orbital with strong electron-electron repulsion. The insulating phase is a so-called charge-transfer insulator, not a Mott-Hubbard insulator. Using cluster dynamical mean-field theory with continuous-time quantum Monte Carlo as an impurity solver and 12 atoms per cluster, we report the normal and superconducting phase diagram of this model as a function of doping, interaction strength, and temperature. As expected, the three-orbital model is consistent with the experimental observation that doped holes are located predominantly on oxygens, a result that goes beyond the one-orbital model. Nevertheless, the phase boundary between pseudogap and correlated metal, the Widom line, and the origin of the pairing energy (kinetic vs potential) are similar to the one-orbital model, demonstrating that these are emergent phenomena characteristic of doped Mott insulators, independently of many microscopic details. Broader implications are discussed.

U2 - 10.1103/PhysRevB.93.245147

DO - 10.1103/PhysRevB.93.245147

M3 - Article

VL - 93

SP - 1

EP - 6

JO - Physical Review B

JF - Physical Review B

SN - 1098-0121

IS - 24

M1 - 245147

ER -