Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1
TT 62.4: Vortrag
Donnerstag, 23. März 2017, 10:15–10:30, HSZ 304
Higgs-modes in non-equilibrium dx2−y2-wave superconductors — •Andreas P. Schnyder1, Holger Krull2, Götz S. Uhrig2, Nikolaj Bittner1, and Dirk Manske1 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart — 2Technische Univerität Dortmund, 44221 Dortmund
The recently developed time-resolved ARPES technique has made it possible to measure collective modes in non-equilibrium quantum systems. Using an iterated equation of motion approach, we investigate the collective Higgs modes of non-equilibrium dx2−y2-wave superconductors and simulate the corresponding time-resolved ARPES spectra. We find that in dx2−y2-wave superconductors two different Higgs modes can be excited by the pump pulse. The relative strength of these two Higgs modes is controlled by the incident angle of the pump pulse. We determine the signatures of these Higgs modes in the time-resolved ARPES response.