Author(s):
1. Ivanka Milošević, Faculty of Physics, University of Belgrade, Serbia
2. Milan Damnjanović, SANU, NanoLab, Fizički fakultet, Univerzitet u Beogradu , 3. Bozidar Nikolic, Faculty of Physics, University of Belgrade, Serbia
4. Zoran Popović, University of Belgrade, Faculty of Physics, Serbia

Abstract:
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.

Key words:
Jahn-Teller effect,electron-phonon coupling,layers

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
06.07.2017.

Conference:
Contemporary Materials 2017 - Savremeni Materijali