Superconductivity mediated by soft ferroelectric modes
DIPC Seminars
- Speaker
-
Maria Navarro Gastiasoro, ISC-CNR and Sapienza University of Rome, Italy
- When
-
2022/05/24
14:00 - Place
- Hybrid Seminar, Donostia International Physics Center
- Add to calendar
- iCal
Superconductivity in doped quantum paraelectric materials develops in
proximity to a ferroelectric phase. An intimate relation between the
superconducting and ferroelectric phases has been experimentally established
in SrTiO3, a model incipient ferroelectric. Quantum critical fluctuations of
the ferroelectric order open the possibility of a novel pairing mechanism. In
this talk I will present a minimal microscopic model for the linear coupling
between electrons and the ferroelectric mode (a soft transverse optical
phonon) in a system with spin-orbit coupling. Remarkably, the Cooper pairing
interaction resulting from this Rashba-like coupling is attractive in even-
parity (s-wave) as well as odd-parity (p- wave) channels. I will show how to
estimate the bare Rashba coupling and BCS pairing coupling constant with the
aid of first-principles computations in SrTiO3. This approach can be easily
extended to other incipient ferroelectrics and interfaces.
Host: Fernando de Juan
Zoom: https://dipc-org.zoom.us/j/85000895872
YouTube: https://youtu.be/qIB7uRhGnt0