Superconductors in non-equilibrium: Higgs oscillations and induced superconductivity
15:00 - 16:00
Max Planck Institute for Solid State Research, Stuttgart
CFEL (Bldg. 99)
Seminar Room II, EG.078
Non-equilibrium pump-probe time-domain spectroscopy opens new perspectives in studying the dynamical properties of strongly correlated electron systems. New effects, such as transient superconductivity or Higgs oscillations of the superconducting condensate can be obtained. Using various methods I present a theoretical study of the non-equilibrium dynamics in superconductors.
First, within the framework of the density matrix theory I study Higgs
oscillations in one- and two-band superconductors which allow to detect
directly properties of the superconducting condensate as a function of time.
For two-band superconductors, the interplay of the phase (Leggett) and
amplitude (Higgs) modes is analyzed in detail and new predictions are made.
Secondly, employing the time-dependent Lanczos algorithm to the one-dimensional
extended Hubbard model, I study the appearance of a transient Meissner effect
which is a fingerprint of induced superconductivity. This is in agreement with
the obtained correlation functions and opens a new way to induce
superconductivity in experiment.