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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity: Theory

TT 22.5: Vortrag

Dienstag, 2. April 2019, 10:30–10:45, H7

Higgs spectroscopy for periodically driven unconventional superconductors — •Lukas Schwarz and Dirk Manske — Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany

Higgs spectroscopy for superconductors in nonequilibrium is a new method to obtain phase-sensitive information about the underlying gap symmetry [1]. One experimental setup to observe the Higgs mode is third-harmonic generation (THG), where the driving frequency of a multicycle THz pulse is brought in resonance with the Higgs mode. This was already successfully demonstrated for s-wave superconductors [2]. We show that THG can be used to observe also additional Higgs modes predicted to occur in d-wave superconductors [3]. They show up as a second resonance in the THG response. Such an additional resonance was found in recent THG experiments on cuprates and can be explained by our theory [4]. This theory is not limited to d-wave superconductors but applies in general to any gap symmetry where multiple Higgs modes are possible. Thus, THG experiments extend the repertoire of Higgs spectroscopy experiments and can be used for the identification of gap symmetries of unconventional superconductors.

[1] B. Fauseweh et al., arXiv:1712.07989 (2017)

[2] R. Matsunaga et al., Science 345, 1145 (2014)

[3] L. Schwarz et al., Higgs spectroscopy for periodically driven unconventional superconductors, arXiv

[4] H. Chu et al., New collective mode in superconducting cuprates uncovered by Higgs spectroscopy, arXiv