Activation of Raman modes in monolayer transition metal dichalcogenides through strong interaction with gold

0557856 - ÚFCH JH 2023 RIV US eng J - Journal Article
Rodriguez, Álvaro - Velický, Matěj - Řáhová, Jaroslava - Zólyomi, V. - Koltai, J. - Kalbáč, Martin - Frank, Otakar
Activation of Raman modes in monolayer transition metal dichalcogenides through strong interaction with gold.
Physical Review B. Roč. 105, č. 19 (2022), č. článku 195413. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR(CZ) GX20-08633X; GA ČR(CZ) GA22-04408S
Grant - others:AV ČR(CZ) LQ200402201
Program: Prémie Lumina quaeruntur
Institutional support: RVO:61388955
Keywords : Raman spectroscopy * transition metal dichalcogenides (TMDCs) * gold * chemical activation
OECD category: Physical chemistry
Impact factor: 3.7, year: 2022
Method of publishing: Open access

Raman spectroscopy has become one of the most utilized methods for the characterization of transition metal dichalcogenides (TMDCs). However, the interpretation of the Raman spectra of TMDC-based heterostructures has been the subject of recent debate. Using a comprehensive combination of micro-Raman and tip-enhanced Raman spectroscopy, accompanied by ab initio simulations of both Raman frequencies and intensities, we show that the activation of the otherwise geometry-forbidden E mode and symmetry-forbidden A1 mode is the fingerprint of the strong interaction between the monolayer MX2 (M is Mo/W, X is S/Se) and the gold substrate, in contrast to the weakly interacting or freestanding MX2.
Permanent Link: http://hdl.handle.net/11104/0331698