Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/GA23-05578S" target="_blank" >GA23-05578S: Řízení spinových qubitů v kvantových paraelektrikách pomocí elektrického pole</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

npj 2D Materials and Applications

ISSN

2397-7132

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

„“-„“

Kód UT WoS článku

001140008600001

EID výsledku v databázi Scopus

2-s2.0-85181845343