Naslov
Dynamical renormalization of electron-phonon coupling in conventional superconductors

Autori
Girotto, Nina ; Novko, Dino

Izvornik
Physical Review B (2469-9950) 107 (2023), 6; 064310, 10

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
phonon, electron-phonon interaction, DFT, nonadiabaticity, 2D materials

Sažetak
The adiabatic Born-Oppenheimer approximation is considered to be a robust approach that very rarely breaks down. Consequently, it is predominantly utilized to address various electron-phonon properties in condensed matter physics. By combining many-body perturbation and density functional theories we demonstrate the importance of dynamical (nonadiabatic) effects in estimating superconducting properties in various bulk and two-dimensional materials. Apart from the expected long-wavelength nonadiabatic effects, we found sizable nonadiabatic Kohn anomalies away from the Brillouin zone center for materials with strong intervalley electron-phonon scatterings. Compared to the adiabatic result, these dynamical phonon anomalies can significantly modify electron-phonon coupling strength λ and superconducting transition temperature T c . Further, the dynamically induced modifications of λ have a strong impact on transport properties, where probably the most interesting is the rescaling of the low-temperature and low-frequency regime of the scattering time 1 / τ from about T 3 to about T 2 , resembling the Fermi liquid result for electron- electron scattering. Our goal is to point out the potential implications of these nonadiabatic effects and reestablish their pivotal role in computational estimations of electron-phonon properties.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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