Characterizing Interlayer Excitons by Spectral Signature in Scattering Visible Near-Field Microscopy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F25%3A00637303" target="_blank" >RIV/61388955:_____/25:00637303 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0368217" target="_blank" >https://hdl.handle.net/11104/0368217</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpclett.5c01052" target="_blank" >10.1021/acs.jpclett.5c01052</a>
Alternative languages
Result language
angličtina
Original language name
Characterizing Interlayer Excitons by Spectral Signature in Scattering Visible Near-Field Microscopy
Original language description
Interlayer excitons (IXs) in van der Waals heterostructures exhibit unique optical properties due to their spatially separated charge carriers. However, the weak oscillator strength and radiative broadening of IXs make them difficult to detect with conventional absorption spectroscopy. Here, we use scattering-type scanning near-field optical microscopy (s-SNOM) to directly probe the dielectric response at the nanoscale. We first validate this approach by measuring the B-exciton in a four-layer MoS2 sample, where ion irradiation introduced defect-induced broadening. Extending this method to a MoSe2/WSe2 heterostructure, we observe a Lorentzian resonance at 1.35 eV, characteristic of interlayer excitons, with broadening dominated by nonradiative decay. These results demonstrate the capability of s-SNOM to image and characterize weak excitonic resonances at the nanoscale, overcoming the limitations of conventional techniques and providing new insights into localized exciton dynamics in 2D heterostructures.
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
10403 - Physical chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Physical Chemistry Letters
ISSN
1948-7185
e-ISSN
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Volume of the periodical
16
Issue of the periodical within the volume
27
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
6960-6967
UT code for WoS article
001520228100001
EID of the result in the Scopus database
2-s2.0-105009752094