Theory of pair density wave on a quasi-one-dimensional lattice in the Hubbard model

Abstract

In this study, we examine the superconducting instability of a quasi-one-dimensional lattice in the Hubbard model based on the random-phase approximation (RPA) and the fluctuation exchange (FLEX) approximation. We find that a spin-singlet pair density wave (PDW-singlet) with a center-of-mass momentum of $2k_F$ can be stabilized when the one-dimensionality becomes prominent toward the perfect nesting of the Fermi surface. The obtained pair is a mixture of even-frequency and odd-frequency singlet ones. The dominant even-frequency component does not have nodal lines on the Fermi surface. This PDW-singlet state is more favorable as compared to RPA when self-energy correction is introduced in the FLEX approximation.

arXiv comment10 pages, 14 figures

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Cited by in corpus (4)

• Identification of a Nematic Pair Density Wave State in Bi2Sr2CaCu2O8+x
• Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba${}_2$CuO${}_{3+y}$ superconductors
• Quasiparticle interference as a direct experimental probe of bulk odd-frequency superconducting pairing
• Multiplicative topological semimetals