Valley resolved dynamics of phonon bottleneck in semiconductor molybdenum ditelluride

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10501637" target="_blank" >RIV/00216208:11310/25:10501637 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-.59EfeUHj" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-.59EfeUHj</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s42005-025-02267-y" target="_blank" >10.1038/s42005-025-02267-y</a>

Result language
angličtina
Original language name
Valley resolved dynamics of phonon bottleneck in semiconductor molybdenum ditelluride
Original language description
Semiconductor molybdenum ditelluride (2H-MoTe2) possess multiple valleys in the band structure, enriching its physical properties and potentials in applications. However, the effect of multiple valleys on the mechanisms of population and relaxation of carriers and phonons remains limited, particularly due to the inadequacy of current optical probes that lack momentum sensitivity. Here, we rely on time resolved measurements of optical absorption and electron diffraction to investigate the carrier intra- and intervalley scattering and the phonon dynamics in different valleys in photoexcited few-layer 2H-MoTe2. Our experimental results are complemented by density functional theory calculations and molecular dynamics simulations. We reveal the pathways and timescales of carrier relaxation, accompanied with the emissions of optical phonons at the Brillouin zone center and acoustic phonons at the zone border. We estimate the population of different phonon modes based on the measured results, identifying quantitatively the occurrences of phonon bottleneck located in different valleys. Our technique allows constructing a comprehensive picture of the complex interactions between carriers and phonons in 2H-MoTe2 with the valley degree of freedom resolved.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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