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Coherent quantum dy...
Coherent quantum dynamics of excitons in monolayer transition metal dichalcogenides
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- Moody, G. (author)
- The University of Texas at Austin, USA,National Institute of Standards and Technology (NIST)
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- Hao, K. (author)
- The University of Texas at Austin, USA
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- Dass, C. K. (author)
- The University of Texas at Austin, USA
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- Singh, A. (author)
- The University of Texas at Austin, USA
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- Xu, L. X. (author)
- The University of Texas at Austin, USA
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- Tran, K. (author)
- The University of Texas at Austin, USA
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- Chen, C. H. (author)
- Feng Chia University
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- Li, M. Y. (author)
- King Abdullah University of Science and Technology (KAUST)
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- Li, L. J. (author)
- King Abdullah University of Science and Technology (KAUST)
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- Clark, G. (author)
- University of Washington
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- Berghäuser, Gunnar, 1983 (author)
- Technische Universität Berlin
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- Malic, Ermin, 1980 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Knorr, A. (author)
- Technische Universität Berlin
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- Xu, X. D. (author)
- University of Washington
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- Li, X. Q. (author)
- The University of Texas at Austin, USA
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(creator_code:org_t)
- ISBN 9781628419818
- SPIE, 2016
- 2016
- English.
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In: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9781628419818 ; 9746
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Abstract
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- Transition metal dichalcogenides (TMDs) have garnered considerable interest in recent years owing to their layer thickness-dependent optoelectronic properties. In monolayer TMDs, the large carrier effective masses, strong quantum confinement, and reduced dielectric screening lead to pronounced exciton resonances with remarkably large binding energies and coupled spin and valley degrees of freedom (valley excitons). Coherent control of valley excitons for atomically thin optoelectronics and valleytronics requires understanding and quantifying sources of exciton decoherence. In this work, we reveal how exciton-exciton and exciton-phonon scattering influence the coherent quantum dynamics of valley excitons in monolayer TMDs, specifically tungsten diselenide (WSe2), using two-dimensional coherent spectroscopy. Excitation-density and temperature dependent measurements of the homogeneous linewidth (inversely proportional to the optical coherence time) reveal that exciton-exciton and exciton-phonon interactions are significantly stronger compared to quasi-2D quantum wells and 3D bulk materials. The residual homogeneous linewidth extrapolated to zero excitation density and temperature is 1:6 meV (equivalent to a coherence time of 0.4 ps), which is limited only by the population recombination lifetime in this sample. (c) (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- spin
- photoluminescence
- Exciton
- wse2
- lifetimes
- semiconductor
- Multi-Dimensional Coherent Spectroscopy
- crystals
- mono layer
- Homogeneous Linewidth
- valley polarization
- Transition Metal Dichalcogenides
- molybdenum-disulfide
- mos2
Publication and Content Type
- kon (subject category)
- ref (subject category)
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- By the author/editor
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Moody, G.
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Hao, K.
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Dass, C. K.
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Singh, A.
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Xu, L. X.
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Tran, K.
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Chen, C. H.
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Li, M. Y.
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Li, L. J.
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Clark, G.
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Berghäuser, Gunn ...
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Malic, Ermin, 19 ...
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Knorr, A.
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Xu, X. D.
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Li, X. Q.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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ENGINEERING AND ...
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and Electrical Engin ...
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Chalmers University of Technology