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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure

TT 2.12: Vortrag

Montag, 16. März 2020, 12:30–12:45, HSZ 103

Raman signatures of the Higgs mode in d-wave superconductors — •Matteo Puviani and Dirk Manske — Max Planck Institute for Solid State Research, Stuttgart, Germany

The amplitude mode (so called "Higgs" mode) in superconductors originates from the Anderson-Higgs mechanism in the symmetry-broken phase and consists of the oscillation of the order parameter with twice the gap energy[1]. Electronic Raman scattering in superconductors probes charge excitations across the superconducting gap, and thus is a valid candidate to provide information about the modes of the order parameter[2,3].

We investigated the role of the Higgs oscillations in d-wave superconductivity with the theoretical simulation of the Raman response for different light polarizations. In particular, we calculated the full Raman vertices’ corrections in the amplitude channel: our results show the presence of a relevant Higgs contribution for the A1g spectrum which could solve the A1g problem[4].

Moreover, with the same theoretical approach, we are able to explain the very last experimental results of the current-assisted activation of the Higgs mode in superconductors[5].

[1] P.B. Littlewood and C.M. Varma, Phys. Rev. B 26, 4883 (1982)

[2] M.V. Klein and S.B. Dierker, Phys. Rev. B 29, 4976 (1984)

[3] T. Cea and L. Benfatto, Phys. Rev. B 90, 224515 (2014)

[4] T.P. Devereaux et al., Phys. Rev. Lett. 72, 396 (1994)

[5] S. Nakamura et al., Phys. Rev. Lett. 122, 257001 (2019)