Programme

O.9 -- Oral, ANSWCCMS-2023

Date: Friday, 10 November 2023

Time: 15:30 - 16:00

Spin-polarized electrical conductivity in quantum ferroelectric metals

Kyong-Min Kim

Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Korea

Ferroelectric metals, known for the captivating coexistence of ferroelectricity and metallicity within a single system, are characterized by their distinctive electron-phonon interactions that exhibit Rashba-type spin-orbit coupling for itinerant electrons. Previous studies have examined the correlated behavior of electrons influenced by this phonon-driven spin-orbit coupling in ferroelectric metals, particularly in proximity to the quantum critical point. In this study, we investigate the profound impact of the phonon-driven spin-orbit coupling on electronic transport properties in these quantum ferroelectric metals. By using the Kubo formula, we reveal the emergence of spin-polarized electrical conductivity, facilitated by the interplay between the phonon-driven spin-orbit coupling and inhomogeneous external electric fields. Furthermore, we showcase that this unconventional conductivity displays distinctive scaling laws as a function of a tuning parameter and temperature. These findings illuminate exotic electronic transport phenomena originating from ferroelectric quantum criticality, highlighting the intricate interplay of charge and spin degrees of freedom.

Presenter: Kyong-Min Kim