[en] The electron-phonon interaction alters substantially the conventional picture of the band structure. It also changes the properties of excitonic states, which are very pronounced in many 2D materials. Using many-body perturbation theory, the authors describe how the inclusion of temperature modifies the electronic bands of single-layer MoS2. Different bands and different regions in the Brillouin zone are affected in different ways by electron-phonon coupling. Using the temperature-broadened bands as input for the Bethe-Salpeter equation, the authors explain why, for the bound A and B excitons, the electron-phonon coupling changes mainly the position, and for the C exciton, only the width is affected by temperature, while the energy is rather constant.
Research center :
ULHPC - University of Luxembourg: High Performance Computing
Disciplines :
Physics
Author, co-author :
Molina-Sanchez, Alejandro ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Palummo, Maurizia
Marini, Andrea
Wirtz, Ludger ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
yes
Language :
English
Title :
Temperature-dependent excitonic effects in the optical properties of single-layer MoS2
Publication date :
2016
Journal title :
Physical Review. B, Condensed Matter
ISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
93
Pages :
155435
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR7731521 - #4;modelling Of Carrier Dynamics And Ultra-fast Spectroscopy In Two-dimensional Materials, 2014 (01/12/2014-31/03/2017) - Alejandro Molina-sánchez
Funders :
FNR - Fonds National de la Recherche [LU] University of Luxembourg - UL