Resonance effects in the Raman scattering of monolayer and few-layer MoSe2

P. SOUBELET; A. E. BRUCHHAUSEN; A. FAINSTEIN; K. NOGAJEWSKI; C. FAUGERAS

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

APS

Año: 2016 vol. 93 p. 155407 - 155407

0163-1829

Using resonant Raman scattering spectroscopy with 25 different laser lines, we describe the Raman scatteringspectra of monolayer and multilayer 2H-molybdenum diselenide (MoSe 2 ) as well as the different resonancesaffecting the most pronounced features. For high-energy phonons, both A- and E-symmetry type phonons presentresonances with A and B excitons of MoSe 2 together with a marked increase of intensity when exciting at higherenergy, close to the C-exciton energy. We observe symmetry-dependent exciton-phonon coupling affecting mainlythe low-energy rigid layer phonon modes. The shear mode for multilayer displays a pronounced resonance withthe C exciton while the breathing mode has an intensity that grows with the excitatio