Program 4 May 2020

Date: May 4th 2020

Time: 13:00 – 18:00 (Geneva time)

Place: Zoom, coordinates provided on invitation

The purpose of this workshop is to advance the understanding of the mechanism of superconducting pairing in SrTiO3. 


Yaron Kedem (Nordita, Stockholm, Sweden)

Dirk van der Marel (University of Geneva, Switzerland)

Nimrod Bachar (University of Geneva, Switzerland)

13h00-13h10 Welcome and instructions (organizers)

13h10-14h25 Phenomenology of the phase diagram

Chair: M. Sigrist

13h10 K. Behnia: Superconducting domes and Lifshitz transitions in strontium titanate: Nb substitution vs. oxygen reduction 

13h25 A. Bhattacharya: Superconductivity in SrTiO3 in the single band limit 

13h40 W. Rischau / I.Inoue: Ferroelectricity and superconductivity in Ca- and 18O-substituted SrTiO3 

13h55 S. Stemmer: Interactions between ferroelectricity and superconductivity in SrTiO3 

14h10 Y. Yanase:  Spin-orbit-coupled ferroelectric superconductivity and multiorbital effects in SrTiO3 

14h30-15h30 General considerations of electron-phonon coupling

Chair: E. Demler

14h30 D. van der Marel: Electron-phonon coupling from optics 

14h45 S. Klimin: Superconductivity and optical response of a many-polaron gas in SrTiO3 

15h00 S. Rowley: Superconductivity mediated by hybrid polar modes in ferroelectric metals

15h15 A. Edelman:  Plasmons and optic phonons in SrTiO3 

15h45-16h45 Superconductivity mediated by FE fluctuations

Chair: C. Berthod

15h45 Y. Kedem: Pairing by quantum critical ferroelectric modes: both sides of the dome

16h00 J. Ruhman: On the relevance of ferroelectric fluctuations to pairing in SrTiO3 

16h15 A. Balatsky: Puzzles of the soft mode and multiband superconductivity in SrTiO3 

16h30 R. Fernandes: Anisotropic superconductivity mediated by ferroelectric fluctuations in cubic systems with spin-orbit coupling: possible application to SrTiO3 

17h00-17h40 General discussion 

Moderator: S. Saxena

17h40-18h00 Concluding overview 

N. Spaldin: What I would still like to understand about SrTiO3