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TT: Fachverband Tiefe Temperaturen

TT 66: Ultrafast Dynamics of Light-Driven Systems

TT 66.8: Vortrag

Freitag, 5. April 2019, 11:45–12:00, H2

Collective modes in non-equilibrium in unconventional superconductors with competing ground states — •Marvin A. Müller¹, Pavel A. Volkov^1,2, and Ilya Eremin¹ — ¹Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany — ²Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey, 08854, USA

Motivated by the recent development of terahertz pump-probe spectroscopy, we investigate the short-time dynamics and collective modes in superconductors with multiple attractive pairing symmetries. We consider a single-band square lattice model with nearest neighbor attraction. This interaction decouples into s−, d− and p−wave channels and by variation of band filling this yields strong competition between these channels. Driving the system out of equilibrium, we find signatures of collective states of symmetries different from the groundstate symmetry, which are called Bardasis-Schrieffer modes in the context of s−wave groundstate. We show that, depending on the polarization direction, additional order parameter symmeries can be excited in pump-probe experiments and the collective ’Bardasis-Schrieffer’ modes can be observed.