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TT: Fachverband Tiefe Temperaturen

TT 61: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)

TT 61.7: Vortrag

Donnerstag, 19. März 2020, 16:45–17:00, HSZ 201

Controlling subdominant pairing symmetries in pumped unconventional superconductors — •Marvin A. Müller¹, Pavel A. Volkov^1,2, Indranil Paul³, and Ilya Eremin^1,4 — ¹Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany — ²Department of Physics and Astronomy, Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA — ³Laboratoire Matériaux et Phénomènes Quantiques, Université de Paris, CNRS, F-75013 Paris, France — ⁴Institute of Physics, Kazan Federal University, Kazan 420008, Russian Federation

We investigate the short-time dynamics in superconductors with multiple attractive pairing channels out of equilibrium. Studying a single-band square lattice model with a spin-spin interaction as an example, we find the signatures of collective excitations of the subdominant pairing symmetries (known as Bardasis-Schrieffer modes) as well as the order parameter amplitude (Higgs mode) in the short-time dynamics of the spectral gap and quasiparticle distribution after an excitation by a pump pulse. We show that the polarization and intensity of the pulse can be used to control the symmetry of the nonequilibrium state as well as frequencies and relative intensities of the contributions of different collective modes. We find particularly strong effects of the Bardasis-Schrieffer mode in the dynamics of the quasiparticle distribution function and propose possible signatures in trARPES experiments.