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SUMMARY:Lighting up superconductivity - Prof Eugene Demler\, ETH Zürich
DTSTART:20231115T160000Z
DTEND:20231115T170000Z
UID:TALK206953@talks.cam.ac.uk
CONTACT:Dr Nur Unal
DESCRIPTION:Recent experiments suggest the phenomenon of light induced sup
 erconductivity above Tc in two different materials: fullerene superconduct
 or K3C60 and high Tc cuprate YBCO. I will discuss the distinct phenomena t
 aking place in these systems. In K3C60\, the unusual character of electron
 -phonon interactions results in enhanced BCS pairing through optical drivi
 ng and the slow relaxation of superconducting correlations after they have
  been created. In YBCO the light induced state is short lived and its prop
 erties can be explained from the perspective of a Floquet material. I will
  present a general theoretical framework for understanding Floquet materia
 ls\, in which the pump-induced oscillations of a collective mode lead to t
 he parametric generation of excitation pairs. This can result in features 
 such as photo-induced edges in reflectivity\, enhancement of reflectivity\
 , and even light amplification.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, J.J. Thomson Avenu
 e
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