Non-Equilibrium dynamics in conventional and unconventional superconductors (CANCELLED)

Benedikt Fauseweh, Max Planck Institute for Solid State Research
Event Date and Time: 
Thu, 2018-03-22 14:00 - 15:00

Due to perosnal reasons Benedikt Fauseweh will unfortunately be unable to join us for this CM-Seminar.

We hope to be able to re-schedule a visit for him at SBQMI at a later date. Thank you for your comprehension.



The recent advancement in time resolved terahertz (THz) pump probe experiments has made it possible to investigate superconductors in a non-equilibrium setup, going far beyond linear response measurements. This opens a unique way in order to observe the symmetry and excitation spectrum of superconductors but also allows to dynamically modify the properties of the material. In my talk I will concentrate on the theoretical description of two features which are already observed in experiment. First we will examine superconducting Higgs oscillations, which are collective excitations of the condensate which can only be excited in the non-linear response regime. Similar to the polarization selection rules for Raman scattering, the Higgs Oscillations are sensitive to the symmetry of the quantum quench. Using a minimal BCS model it is possible to show, that these modes are also observable in the spectral function of the superconductor, making it traceable in an THz-pump ARPES-probe experiment. Second we will use the matrix product state formalism to study the concept of induced/enhanced superconductivity. Explicitly we will calculate superconducting correlation functions of the extended Hubbard model, to see how superconductivity builds up after a strong non-equilibrium excitation.

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