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Author Bhargavi, K. S. ♦ Patil, Sukanya ♦ Kubakaddi, S. S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABSORPTION ♦ ABUNDANCE ♦ CARRIERS ♦ DEFORMATION ♦ EFFECTIVE MASS ♦ ELECTRONS ♦ MOLYBDENUM SULFIDES ♦ N-TYPE CONDUCTORS ♦ PHONONS ♦ PHOTONS ♦ PIEZOELECTRICITY ♦ POLARIZATION ♦ QUANTUM WELLS ♦ SCATTERING
Abstract The theory of free-carrier absorption (FCA) is given for monolayers of transition-metal dichalcogenides, particularly for molybdenum disulphide (MoS{sub 2}), when carriers are scattered by phonons. Explicit expressions for the absorption coefficient α are obtained and discussed for acoustic phonon scattering via screened deformation potential and piezoelectric coupling taking polarization of the radiation in the plane of the layer. It is found that α monotonously decreases with the increasing photon frequency Ω, increases with the increasing temperature T, and linearly depends on two-dimensional electron concentration n{sub s}. Effect of screening, which is ignored in all the earlier FCA studies, is found to reduce α significantly, attributing to the larger effective mass of the electrons. Results are also obtained in the classical and quantum limit giving the power laws α ∼ Ω{sup −2} and T. Comparison of the results is made with those in bulk semiconductors and semiconductor quantum wells.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-28
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 118
Issue Number 4


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