Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 83: Superconductivity: (General) Theory

TT 83.3: Talk

Thursday, March 15, 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.
Yuzbashyan, Dzero, Phys. Rev. Lett. 96 (2006) 230404
Krull, Manske, Uhrig, Schnyder, Phys. Rev. B 90 (2014) 014515
Krull et al., Nat. Commun. 7 (2016) 11921
Matsunaga, Shimano Phys. Rev. Lett. 109 (2012) 187002,