Research output: Contribution to journal › Article › peer-review
Observation of exciton-phonon coupling in MoSe2 monolayers. / Shree, S.; Robert, C.; Han, B.; Amand, T.; Balocchi, A.; Manca, M.; Courtade, E.; Marie, X.; Taniguchi, T.; Watanabe, K.; Glazov, M. M.; Urbaszek, B.
In: Physical Review B, Vol. 98, No. 3, 035302, 16.07.2018.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Observation of exciton-phonon coupling in MoSe2 monolayers
AU - Shree, S.
AU - Robert, C.
AU - Han, B.
AU - Amand, T.
AU - Balocchi, A.
AU - Manca, M.
AU - Courtade, E.
AU - Marie, X.
AU - Taniguchi, T.
AU - Watanabe, K.
AU - Glazov, M. M.
AU - Urbaszek, B.
PY - 2018/7/16
Y1 - 2018/7/16
N2 - We study experimentally and theoretically the exciton-phonon interaction in MoSe2 monolayers encapsulated in hexagonal BN, which has an important impact on both optical absorption and emission processes. The exciton transition linewidth down to 1 meV at low temperatures makes it possible to observe high-energy tails in absorption and emission extending over several meV, not masked by inhomogeneous broadening. We develop an analytical theory of the exciton-phonon interaction accounting for the deformation potential induced by the longitudinal acoustic phonons, which plays an important role in exciton formation. The theory allows fitting absorption and emission spectra and permits estimating the deformation potential in MoSe2 monolayers. We underline the reasons why exciton-phonon coupling is much stronger in two-dimensional transition metal dichalcogenides as compared to conventional quantum well structures. The importance of exciton-phonon interactions is further highlighted by the observation of a multitude of Raman features in the photoluminescence excitation experiments.
AB - We study experimentally and theoretically the exciton-phonon interaction in MoSe2 monolayers encapsulated in hexagonal BN, which has an important impact on both optical absorption and emission processes. The exciton transition linewidth down to 1 meV at low temperatures makes it possible to observe high-energy tails in absorption and emission extending over several meV, not masked by inhomogeneous broadening. We develop an analytical theory of the exciton-phonon interaction accounting for the deformation potential induced by the longitudinal acoustic phonons, which plays an important role in exciton formation. The theory allows fitting absorption and emission spectra and permits estimating the deformation potential in MoSe2 monolayers. We underline the reasons why exciton-phonon coupling is much stronger in two-dimensional transition metal dichalcogenides as compared to conventional quantum well structures. The importance of exciton-phonon interactions is further highlighted by the observation of a multitude of Raman features in the photoluminescence excitation experiments.
KW - TRANSITION-METAL DICHALCOGENIDES
KW - GAAS QUANTUM-WELLS
KW - RAMAN-SCATTERING
KW - DYNAMICS
KW - WSE2
KW - PHOTOLUMINESCENCE
KW - HETEROSTRUCTURES
KW - OPTOELECTRONICS
KW - SEMICONDUCTOR
KW - RELAXATION
UR - http://www.scopus.com/inward/record.url?scp=85050471483&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/observation-excitonphonon-coupling-mose2-monolayers
U2 - 10.1103/PhysRevB.98.035302
DO - 10.1103/PhysRevB.98.035302
M3 - Article
AN - SCOPUS:85050471483
VL - 98
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 3
M1 - 035302
ER -
ID: 36286656