1. Ivanka Milošević, Faculty of Physics, University of Belgrade, Serbia
2. Милан Дамњановић, САНУ, НаноЛаб, Физички факултет, Универзитет у Београду , 3. Bozidar Nikolic, Faculty of Physics, University of Belgrade, Serbia
4. Zoran Popović, University of Belgrade, Faculty of Physics, Serbia
Due to (quasi)-two-dimensionality, layered structures exhibit quite a specific behaviour. Our systematic symmetry based analysis of all such systems enlightens significant deficiencies of electron-phonon coupling (within first order theory) in particular oblique, rectangular, square and hexagonal diperiodic lattices, among which are superconducting CuO2 sheet, atomically thin hBN and graphene. Some of the manifestations are: absence of the totally symmetric phonons, inefficiency of the conditions providing Kohn singularity, nonlinear acoustic branches, electronic states decoupled from phonons, spontaneous symmetry breaking, exceptions from the Jahn-Teller theorem.
Кључне речи :
Тематска област:
СИМПОЗИЈУМ А - Наука материје, кондензоване материје и физикa чврстог стања
Датум:
06.07.2017.
Contemporary Materials 2017 - Савремени Материјали
