Fig. 5: Superconducting stiffness in arbitrary units as a function of bias current to critical current ratio.
From: Quasiparticle and superfluid dynamics in Magic-Angle Graphene
Inset, bottom left: Schematics of Bogoliubov-de Gennes quasiparticle band structure of a superconductor with isotropic gap. The solid straight line represents the Fermi energy at zero current bias. The dashed line represents the Fermi energy at a non-zero current bias. Inset, top right: Schematics of quasiparticle band structure of a superconductor with anisotropic gap. The red and blue areas represent respectively the hole and electron pockets that form at the band edges under a finite current bias.
