Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 99: Superconductivity: (General) Theory 2
TT 99.4: Talk
Thursday, March 19, 2015, 15:45–16:00, H 2053
Tuning non-equilibrium superconductors with lasers — •Michael A. Sentef1, Alexander F. Kemper2, Antoine Georges3, and Corinna Kollath1 — 1HISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany — 2LBL Berkeley, USA — 3Ecole Polytechnique and College de France, Paris, France
The study of the real-time dynamics dynamics of solids perturbed by short laser pulses is an intriguing opportunity of ultrafast materials science. Previous theoretical work on pump-probe photoemission spectroscopy revealed spectroscopic signatures of electron-boson coupling [1, 2], which are reminiscent of features observed in recent pump-probe photoemission experiments on cuprate superconductors [3, 4]. Here we investigate the ordered state of electron-boson mediated superconductors subject to laser driving using Migdal-Eliashberg theory on the Kadanoff-Baym-Keldysh contour. We extract the characteristic time scales on which the non-equilibrium superconductor reacts to the perturbation, and their relation to the coupling boson and the underlying order.
[1] M. Sentef et al., Phys. Rev. X 3, 041033 (2013).
[2] A. F. Kemper et al., Phys. Rev. B 90, 075126 (2014).
[3] J. Graf et al., Nat. Phys. 7, 805 (2011);
W. Zhang et al., Nat. Comm. 5, 4959 (2014).
[4] J. D. Rameau et al., Phys. Rev. B 89, 115115 (2014).