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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.23: Poster

Monday, March 18, 2024, 15:00–18:00, Poster C

Signatures of a pair-density wave state in the third harmonic generation. — •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 in Refs. [1,2]. The system possesses a unidirectional PDW state in thermodynamic equilibrium ground state without extra need for an additional perturbation such as external Zeeman field. 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 similarities and differences between the PDW’s s-wave and d-wave pairing channels and study the difference between the phase modes of s- and d-wave and the phase modes between the finite momentum pairings Δ_q at q=−Q and q=Q.

[1] F. Loder et al., Phys. Rev. B 81, 020511(R) (2010)
[2] J. Wårdh and M. Granath, Phys. Rev. B 96, 224503 (2017)

Keywords: Pair-density wave; Third harmonic generation; Driven system; Uncoventional superconductivity