title: Transient Dynamics of d-Wave Superconductors after a Sudden Excitation.
abstract: Motivated by recent ultrafast pump-probe experiments on high-temperature superconductors, we discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. We find that the existence of gap nodes, with the associated nodal quasiparticles, introduces a decay channel which makes the dynamics much faster than in the conventional s-wave model. For every value of the quench parameter, the superconducting gap rapidly converges to a stationary value smaller than the one at equilibrium. Using a sudden approximation for the gap dynamics, we find an analytical expression for the reduction of spectral weight close to the nodes, which is in qualitative agreement with recent experiments.
authors.affiliation: International School for Advanced Studies (SISSA/ISAS) and CNR-IOM Democritos, Via Bonomea 265, 34136 Trieste, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Peronaci
authors.affiliation: Institut de Physique Théorique, Université Paris Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France.
authors.forename: Marco
authors.initials: M
authors.lastname: Schiró
authors.affiliation: International School for Advanced Studies (SISSA/ISAS) and CNR-IOM Democritos, Via Bonomea 265, 34136 Trieste, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Capone