Superconductivity, antiferromagnetism, and phase separation in the two-dimensional Hubbard model: A dual-fermion approach

Junya Otsuki, Hartmut Hafermann, Alexander I. Lichtenstein

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The dual-fermion approach offers a way to perform diagrammatic expansion around the dynamical mean field theory. Using this formalism, the influence of antiferromagnetic fluctuations on the self-energy is taken into account through ladder-type diagrams in the particle-hole channel. The resulting phase diagram for the (quasi-)two-dimensional Hubbard model exhibits antiferromagnetism and d-wave superconductivity. Furthermore, a uniform charge instability, i.e., phase separation, is obtained in the low-doping regime around the Mott insulator. We also examine spin/charge density wave fluctuations including d-wave symmetry. The model exhibits a tendency towards an unconventional charge density wave, but no divergence of the susceptibility is found.

Original languageEnglish
Article number235132
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number23
DOIs
Publication statusPublished - Dec 18 2014
Externally publishedYes

Fingerprint

Antiferromagnetism
Charge density waves
Hubbard model
Fermions
antiferromagnetism
Superconductivity
two dimensional models
Phase separation
superconductivity
fermions
Mean field theory
Spin waves
Ladders
Phase diagrams
Doping (additives)
ladders
divergence
tendencies
diagrams
phase diagrams

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Superconductivity, antiferromagnetism, and phase separation in the two-dimensional Hubbard model : A dual-fermion approach. / Otsuki, Junya; Hafermann, Hartmut; Lichtenstein, Alexander I.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 23, 235132, 18.12.2014.

Research output: Contribution to journalArticle

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