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Electron-phonon interaction in SrTiO3

A talk by S. N. Klimin in collaboration with J. Tempere and J. T. Devreese, TQC group, University of Antwerp, Belgium

DATE / TIME: Monday, June 19th 2017, 4:00 p.m.
Erwin Schrödinger Lecture Hall, 5th floor, Boltzmanngasse 5, 1090 Vienna

ABSTRACT: Strontium titanate is a unique material which exhibits interesting features which are not encountered in conventional polar crystals at the same conditions. It becomes a superconductor at unusually low carrier densities. This gives one a reason to call SrTiO3 “the most dilute superconductor”. SrTiO3 is probably the only substance where superconductivity and optical absorption can be convincingly attributed to the Fröhlich-like electron-phonon interaction and polarons.

In the present talk, a review of manifestations of the electron-phonon coupling in strontium titanate is given. We are particularly focused on our recent theoretical studies of the many-polaron optical conductivity of doped SrTiO3 and superconductivity in bulk strontium titanate and SrTiO3-based planar structures, with a comparative discussion of different theoretical interpretations of the optical response and superconductivity in SrTiO3.






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