Collective modes in pumped unconventional superconductors with competing ground states

Abstract

Motivated by the recent development of terahertz pump-probe experiments, we investigate the short-time dynamics in superconductors with multiple attractive pairing channels. Studying a single-band square lattice model with spin-spin interaction as an example, we find the signatures of collective excitations of the 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 non-equilibrium state as well as frequencies and relative intensities of the contributions of different collective modes. We find particularly strong signatures of the Bardasis-Schrieffer mode in the dynamics of the quasiparticle distribution function. Our work shows the potential of modern ultrafast experiments to address the collective excitations in unconventional superconductors and highlights the importance of sub-dominant interactions for the non-equilibrium dynamics in these systems.

arXiv comment5+3 pages, 5+1 figures

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• Classification and characterization of nonequilibrium Higgs modes in unconventional superconductors
• Collective modes and terahertz near-field response of superconductors
• Non-equilibrium phenomena in superconductors probed by femtosecond time-domain spectroscopy
• Spectroscopic signatures of time-reversal symmetry breaking superconductivity
• Periodic dynamics in superconductors induced by an impulsive optical quench
• Theory of Higgs Modes in $d$-Wave Superconductors
• Phase signatures in third-harmonic response of Higgs and coexisting modes in superconductors
• Quench-drive spectroscopy and high-harmonic generation in BCS superconductors
• Momentum-resolved analysis of condensate dynamic and Higgs oscillations in quenched superconductors with tr-ARPES
• Interplay between nematicity and Bardasis-Schrieffer modes in the short-time dynamics of unconventional superconductors
• Bardasis-Schrieffer-like phase mode in a superconducting bilayer
• Exact Continuum Representation of Long-range Interacting Systems and Emerging Exotic Phases in Unconventional Superconductors
• Collective excitations in competing phases in two and three dimensions
• The role of orbital nesting in the superconductivity of Iron-based Superconductors
• Terahertz pulse-driven collective mode in the nematic superconducting state of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Optical Pumping of Bardeen-Cooper-Schrieffer Superconductors
• Signatures of Bardasis-Schrieffer mode excitation in Third-Harmonic generated currents