Paramagnetic contribution in superconductors with different-mass Cooper pairs

Abstract

Cooper pairs formed by two electrons with different effective masses are common in multiband superconductors, pair density wave states, and other superconducting systems with multiple degrees of freedom. In this paper, we show that there are paramagnetic contributions to the superfluid stiffness in superconductors with different-mass Cooper pairs. This paramagnetic response is owing to the relative motion between two electrons with different mass. Additionally, we identify a particle-hole dichotomy effect related to this mass difference. We investigate the paramagnetic contributions based on the linear-response theory in two-band superconductors with interband pairings and in pair density wave states, respectively. Our results offer a different perspective of the electromagnetic superfluid stiffness in unconventional superconductors beyond the traditional BCS response.

arXiv comment5 pages, 4 figures in the main text and 6 pages, 4 figures in the supplemental material

References in corpus (12)

• High-temperature superconductivity in iron-based materials
• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• The Physics of Pair Density Waves
• Detection of a Cooper-Pair Density Wave in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$
• Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
• Magnetic-field Induced Pair Density Wave State in the Cuprate Vortex Halo
• Locating the missing superconducting electrons in overdoped cuprates
• Visualizing the periodic modulation of Cooper pairing in a severely underdoped cuprate
• From Mott to not: phenomenology of overdoped cuprates
• Theory of optical responses in clean multi-band superconductors
• Anisotropic scattering caused by apical oxygen vacancies in thin films of overdoped high-temperature cuprate superconductors
• Charge 4$e$ superconductor: a wavefunction approach

Cited by in corpus (1)

• Sublattice Dichotomy in Monolayer FeSe Superconductor