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TT: Fachverband Tiefe Temperaturen

TT 98: Poster Session: Superconductivity

TT 98.19: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Higgs spectroscopy of superconductors in nonequilibrium — •Lukas Schwarz, Benedikt Fauseweh, and Dirk Manske — Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany

In superconductors, a fundamental collective excitation of Cooper pairs exists which arises due to the spontaneous U(1) symmetry breaking. This mode is called Higgs mode in analogy to high-energy physics. In recent years, Higgs oscillations in s-wave superconductors in nonequilibrium excited by short THz laser pulses were intensively studied. We show that such pump-probe experiments on unconventional superconductors with non-trivial gap symmetry can excite multiple different Higgs modes. As these modes can be classified by the underlying lattice point group, an identification of these modes allows to draw conclusions about the gap symmetry. Therefore, Higgs oscillations have a great potential to become a spectroscopic method for investigations of gap symmetries in superconductors.