Temperature Dependence of the Indirect Gap and the Direct Optical Transitions at the High-Symmetry Point of the Brillouin Zone and Band Nesting in MoS<sub>2</sub>, MoSe<sub>2</sub>, MoTe<sub>2</sub>, WS<sub>2</sub>, and WSe<sub>2</sub> Crystals
Jan Kopaczek, Szymon J. Zelewski, Kentaro Yumigeta, Renee Sailus, Sefaattin Tongay, R. Kudrawiec
Abstract
-points of the Brillouin zone, their temperature dependencies were analyzed using the Varshni relation and Bose-Einstein expression. It was shown that the temperature energy shift for the transition associated with band nesting is smaller when compared with the one at high-symmetry point, revealing reduced average electron-phonon interaction strength.
Topics & Concepts
Brillouin zoneCondensed matter physicsElectronic band structureBand gapDirect and indirect band gapsNesting (process)Materials scienceCritical point (mathematics)Symmetry (geometry)PhononAbsorption (acoustics)OpticsPhysicsMathematical analysisGeometryMetallurgyMathematics2D Materials and ApplicationsPerovskite Materials and ApplicationsChalcogenide Semiconductor Thin Films