Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: (General) Theory

TT 14.7: Hauptvortrag

Montag, 7. März 2016, 16:45–17:15, H19

Spectroscopic signatures of collective modes in superconductors — •Lara Benfatto — ISC-CNR and Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy

The technological progresses made in the last few years in the spectroscopic techniques require a critical revision of our understanding of the interactions of the light with the matter. In the case of superconducting systems light can in principle couple both to fermionic single-particle excitations and to bosonic superconducting collective modes, i.e. amplitude (Higgs) or phase fluctuations of the superconducting order parameter. At low temperature single-particle excitations are suppressed at energies below twice the gap value, leaving a window to the potential spectroscopic detection of the collective excitations in disordered superconductors. In this talk I will review some recent theoretical progresses in our understanding of the role of superconducting modes in linear and non-linear optical spectroscopy.