Dresden 2020 – wissenschaftliches Programm
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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. 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.
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.
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