Ultrafast Hidden Spin Polarization Dynamics of Bright and Dark Excitons in 2H-WSe2
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F23%3A43972158" target="_blank" >RIV/49777513:23640/23:43972158 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.066402" target="_blank" >https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.066402</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.131.066402" target="_blank" >10.1103/PhysRevLett.131.066402</a>
Alternative languages
Result language
angličtina
Original language name
Ultrafast Hidden Spin Polarization Dynamics of Bright and Dark Excitons in 2H-WSe2
Original language description
We performed spin-, time- and angle- resolved extreme ultraviolet photoemission spectroscopy of excitons prepared by photoexcitation of inversion-symmetric 2H-WSe2 with circularly polarized light. The very short probing depth of XUV photoemission permits selective measurement of photoelectrons originating from the top-most WSe2 layer, allowing for direct measurement of hidden spin polarization of bright and momentum-forbidden dark excitons. Our results reveal efficient chiroptical control of bright excitons' hidden spin polarization. Following optical photoexcitation, intervalley scattering between nonequivalent K-K ' valleys leads to a decay of bright excitons' hidden spin polarization. Conversely, the ultrafast formation of momentum-forbidden dark excitons acts as a local spin polarization reservoir, which could be used for spin injection in van der Waals heterostructures involving multilayer transition metal dichalcogenides.
Czech name
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Czech description
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Classification
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
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
131
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
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UT code for WoS article
001162017900003
EID of the result in the Scopus database
2-s2.0-85168741166