η-pairing superconductivity in the Hubbard chain with pair hopping
G. I. Japaridze, A. P. Kampf, M. Sekania, P. Kakashvili, Ph. Brune
DOI 10.1103/PhysRevB.65.014518 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The ground-state phase diagram of the one-dimensional Hubbard chain with pair-hopping interaction is studied. The analysis of the model is performed using the continuum-limit field theory approach and exact diagonalization studies. At half-filling the phase diagram is shown to consist of two superconducting states with Cooper-pair center-of-mass momentum Q=0 (BCS−η0 phase) and Q=π (ηπ phase) and four insulating phases corresponding to the Mott antiferromagnet, the Peierls dimerized phase, the charge-density-wave (CDW) insulator, and an unconventional insulating phase characterized by the coexistence of a CDW and a bond-located staggered magnetization. Away from half-filling the phase diagram consists of the superconducting BCS−η0 and ηπ phases and the metallic Luttinger-liquid phase. The BCS−η0 phase exhibits a smooth crossover from a weak-coupling BCS type to a strong-coupling local-pair regime. The ηπ phase shows the properties of the doublon (zero-size Cooper-pair) superconductor with Cooper-pair center-of-mass momentum Q=π. The transition into the ηπ-paired state corresponds to an abrupt change in the ground-state structure. After the transition the conduction band is completely destroyed and a new ηπ-pair band, corresponding to the strongly correlated doublon motion, is created.
Similar papers
η-superconductivity in the Hubbard chain with pair hopping
similarity 0.92G. I. Japaridze et al. · 2000 · arXiv:cond-mat/0006401
Source status unknown — claims are unverified
Quantum Monte Carlo and exact diagonalization study of a dynamic Hubbard model
similarity 0.90J. E. Hirsch · 2002 · arXiv:cond-mat/0201005
Source status unknown — claims are unverified
Antiferromagnetic to superconducting phase transition in the hole- and electron-doped Hubbard model at zero temperature
similarity 0.89M. Aichhorn et al.
Source status unknown — claims are unverified
Competition between d-wave superconductivity and antiferromagnetism in the two-dimensional Hubbard model
similarity 0.88M. Capone & G. Kotliar
Source status unknown — claims are unverified
Evolution of the dynamical pairing across the phase diagram of a strongly correlated high-temperature superconductor
similarity 0.88M. Civelli · 2008 · arXiv:0812.1201
Source status unknown — claims are unverified
Theory of pair density wave on a quasi-one-dimensional lattice in the Hubbard model
similarity 0.88Soma Yoshida et al. · 2021 · arXiv:2102.00607
Source status unknown — claims are unverified