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Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Fast relaxation of photo-excited carriers in 2-D transition metal dichalcogenides
AU - Danovich, M.
AU - Aleiner, I. L.
AU - Drummond, N. D.
AU - Fal’ko, V. I.
N1 - ©2016 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
PY - 2017/1
Y1 - 2017/1
N2 - We predict a fast relaxation of photo-excited carriers in monolayer transition metal dichalcogenides, which is mediated by the emission of longitudinal optical (LO) and homopolar (HP) phonons. By evaluating Born effective charges for MoS2, MoSe2, WS2, and WSe2, we find that, due to the polar coupling of electrons with LO phonons, and the HP phonons lattice deformation potential, the cooling times for hot electrons and holes from excitation energies of several hundred meV are at ps-scale.
AB - We predict a fast relaxation of photo-excited carriers in monolayer transition metal dichalcogenides, which is mediated by the emission of longitudinal optical (LO) and homopolar (HP) phonons. By evaluating Born effective charges for MoS2, MoSe2, WS2, and WSe2, we find that, due to the polar coupling of electrons with LO phonons, and the HP phonons lattice deformation potential, the cooling times for hot electrons and holes from excitation energies of several hundred meV are at ps-scale.
KW - chalcogenide glasses
KW - electron-phonon interactions
KW - hot carriers
KW - molybdenum compounds
KW - monolayers
KW - tungsten compounds
KW - 2D transition metal dichalcogenides
KW - Born effective charges
KW - MoS2
KW - MoSe2
KW - WS2
KW - WSe2
KW - cooling times
KW - excitation energies
KW - fast photoexcited carrier relaxation
KW - homopolar phonon emission
KW - hot electrons
KW - lattice deformation potential
KW - longitudinal optical phonon emission
KW - monolayer transition metal dichalcogenides
KW - polar electron coupling
KW - Charge carrier processes
KW - Couplings
KW - Optical coupling
KW - Optical scattering
KW - Phonons
KW - Stimulated emission
KW - TMDCs
KW - optoelectronics
KW - ultrafast relaxation
U2 - 10.1109/JSTQE.2016.2583059
DO - 10.1109/JSTQE.2016.2583059
M3 - Journal article
VL - 23
JO - IEEE Journal of Selected Topics in Quantum Electronics
JF - IEEE Journal of Selected Topics in Quantum Electronics
SN - 1077-260X
IS - 1
M1 - 6000105
ER -