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. 

Organizers:

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