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TT: Fachverband Tiefe Temperaturen

TT 34: Superconductivity: Theory

TT 34.12: Vortrag

Mittwoch, 19. März 2025, 18:00–18:15, H36

Third-harmonic generation currents in pair-density wave superconductor — •Pascal Derendorf¹, Peayush Choubey², and Ilya Eremin¹ — ¹Institut für Theoretische Physik III, Ruhr-Universität Bochum, Bochum, Germany — ²Indian Institute of Technology-Roorkee, Roorkee, India

We investigate the signatures of a unidirectional pair-density wave (PDW) state in the third harmonic generation (THG) using an effective microscopic model, developed previously in Refs. [1,2]. The system possesses a unidirectional PDW state with d-wave symmetry in thermodynamic equilibrium ground state without extra need for an additional perturbation such as external Zeeman field or leading charge density wave order. We extend this model under the non-equilibrium by including a periodic driving in the form of external ac-field. The signatures of the emerging massive modes on the THG are derived via a gauge-invariant effective action approach. We discuss the emerging signatures in the third harmonic generation and their origin.

[1] F. Loder et al., Phys. Rev. B 81 (2010).
[2] J. Wårdh and M. Granath., Phys. Rev. B 96 (2017).

Keywords: Pair-Density Wave; Driven System