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Fast relaxation of photo-excited carriers in 2-D transition metal dichalcogenides

Danovich, M. and Aleiner, I. L. and Drummond, N. D. and Fal’ko, V. I. (2017) Fast relaxation of photo-excited carriers in 2-D transition metal dichalcogenides. IEEE Journal of Selected Topics in Quantum Electronics, 23 (1). ISSN 1077-260X

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    Abstract

    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.

    Item Type: Journal Article
    Journal or Publication Title: IEEE Journal of Selected Topics in Quantum Electronics
    Additional Information: ©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.
    Uncontrolled Keywords: chalcogenide glasses ; electron-phonon interactions ; hot carriers ; molybdenum compounds ; monolayers ; tungsten compounds ; 2D transition metal dichalcogenides ; Born effective charges ; MoS2 ; MoSe2 ; WS2 ; WSe2 ; cooling times ; excitation energies ; fast photoexcited carrier relaxation ; homopolar phonon emission ; hot electrons ; lattice deformation potential ; longitudinal optical phonon emission ; monolayer transition metal dichalcogenides ; polar electron coupling ; Charge carrier processes ; Couplings ; Optical coupling ; Optical scattering ; Phonons ; Stimulated emission ; TMDCs ; optoelectronics ; ultrafast relaxation
    Subjects:
    Departments: Faculty of Science and Technology > Physics
    ID Code: 81941
    Deposited By: ep_importer_pure
    Deposited On: 10 Oct 2016 13:06
    Refereed?: Yes
    Published?: Published
    Last Modified: 19 Jun 2018 05:16
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/81941

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