Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F24%3APU151613" target="_blank" >RIV/00216305:26620/24:PU151613 - isvavai.cz</a>

Result on the web

<a href="https://www.nature.com/articles/s41699-023-00438-5" target="_blank" >https://www.nature.com/articles/s41699-023-00438-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41699-023-00438-5" target="_blank" >10.1038/s41699-023-00438-5</a>

Result language

angličtina

Original language name

Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

Original language description

Raman scattering excitation (RSE) is an experimental technique in which the spectrum is made up by sweeping the excitation energy when the detection energy is fixed. We study the low-temperature (T = 5 K) RSE spectra measured on four high quality monolayers (ML) of semiconducting transition metal dichalcogenides (S-TMDs), i.e. MoS2, MoSe2, WS2, and WSe2, encapsulated in hexagonal BN. The outgoing resonant conditions of Raman scattering reveal an extraordinary intensity enhancement of the phonon modes, which results in extremely rich RSE spectra. The obtained spectra are composed not only of Raman-active peaks, i.e. in-plane E ' and out-of-plane A(1)', but the appearance of 1st, 2nd, and higher-order phonon modes is recognized. The intensity profiles of the A(1)' modes in the investigated MLs resemble the emissions due to neutral excitons measured in the corresponding PL spectra for the outgoing type of resonant Raman scattering conditions. Furthermore, for the WSe2 ML, the A(1)' mode was observed when the incoming light was in resonance with the neutral exciton line. The strength of the exciton-phonon coupling (EPC) in S-TMD MLs strongly depends on the type of their ground excitonic state, i.e. bright or dark, resulting in different shapes of the RSE spectra. Our results demonstrate that RSE spectroscopy is a powerful technique for studying EPC in S-TMD MLs.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

21001 - Nano-materials (production and properties)

Project

<a href="/en/project/GA23-05578S" target="_blank" >GA23-05578S: Electric-field control of spin-qubits in quantum paraelectrics</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

npj 2D Materials and Applications

ISSN

2397-7132

e-ISSN

—

Volume of the periodical

8

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

„“-„“

UT code for WoS article

001140008600001

EID of the result in the Scopus database

2-s2.0-85181845343