Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Properties and Electronic Structure 1

TT 2.6: Invited Talk

Monday, March 20, 2017, 11:00–11:30, HSZ 103

The Echo of Superconductivity: Higgs Oscillations of Superconductors in Non-Equilibrium — •Dirk Manske — Max-Planck-Institut für Festkörperforschung

Since the 1:1 analogy of superconductivity with the Higgs mechanism in high-energy physics, the Higgs mode in condensed matter attracted much interest recently [1]. Using Density-Matrix-Theory we predicted in 2008 the existence of Higgs oscillations in superconductors under non-equilibrium conditions. Recently, they have been observed in the optical conductivity of a BCS superconductor using time-resolved pump-probe experiments.

New predictions are made for 2-band superconductors [2] in which 2 Higgs oscillations can not only couple, but also are changing the dispersion of the Leggett mode. This provides a unique coupling between phase and amplitude that can occur only in non-equilibrium.

The nature of Higgs oscillations allows to determine the symmetry of the superconducting order parameter and, thus, marks the way to establish a new 'Higgs spectroscopy' of unconventional superconductors.

[1] D. Manske and M. Dressel, Physik Journal 15, 37 (Jan 2016).

[2] H. Krull et al., Nature Comm. 7, 11921 (2016).