2023 CAP Congress / Congrès de l'ACP 2023

(POS-28) Higher-order electron-phonon interactions and their effect on the dielectric and thermal properties of strongly-correlated 2D Dirac crystals

Jun 20, 2023, 5:54 PM

2m

Richard J. Currie Center (University of New Brunswick)

Poster (Non-Student) / Affiche (Non-étudiant(e)) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) DCMMP Poster Session & Student Poster Competition (9) | Session d'affiches DPMCM et concours d'affiches étudiantes (9)

Speaker

Prof. Giovanni Fanchini (University of Western Ontario)

Description

The unique structure of two-dimensional (2D) Dirac crystals, with electronic bands linear in the proximity of the Brillouin-zone boundary and the Fermi energy, creates anomalous situations where small Fermi-energy perturbations critically affect the electron-related lattice properties of these systems.[1] We have studied the interaction of these electrons with acoustic phonons, where the phonon frequency is also linear in their wavenumber. We show that in these systems considering higher-order electron-phonon interaction terms is essential to understand many critical crystal properties, including the dielectric function and the thermal conductivity, which we will present as a function of temperature in the special case of graphene.

[1] Kazemian and Fanchini, J. Phys.: Condens. Matter 35 325601 (2023)