Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 83: Superconductivity: (General) Theory

TT 83.3: Vortrag

Donnerstag, 15. März 2018, 10:00–10:15, HFT-FT 101

Higgs Spectroscopy of Superconductors in Nonequilibrium — •Benedikt Fauseweh and Dirk Manske — Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany

In previous studies it has been shown, that the non-equilibrium response of superconductors allows for probing of the amplitude-, or Higgs-, mode of the superconducting condensate [1]. This feature was predicted in theory with different quenching protocols [2,3] and found in experiments using ultra-short laser pulses in the THZ Regime [4]. So far only s-wave superconductors with a constant energy gap as a function of momentum have been investigated.

In our contribution we present a systematic study of Higgs oscillations using a combination of non-equilibrium excitation and symmetry analysis. This allows for a full characterization of the superconducting gap function, similar to Phonon spectroscopy. By investigating the non-equilibrium response of s- and d-wave superconductors we show, that non-equilibrium Higgs-spectroscopy opens a unique approach to distinguish between different symmetries of the condensate. Finally, we propose new methods to implement these ideas in experiments.
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