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

Autor:	Yoshida, Soma, Yada, Keiji, Tanaka, Yukio
Rok vydání:	2021
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. B 104, 094506 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.104.094506
Popis:	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. Comment: 10 pages, 14 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2102.00607 Zobrazit plný text záznamu View this record from Arxiv