Publication detail

Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

BARTOŠ, M. ZINKIEWITZ, M. GRZESZCZYK, M. KAZIMIERCZUK, T. NOGAJEWSKI, K. PACUSKI, W. WATANABE, K. TANIGUCHI, T. WYSMOŁEK, A. KOSSACKI, P. POTEMSKI, M. BABINSKI, A. MOLAS, M.

Original Title

Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

BULK; EXCITONS; WSE2

Authors

BARTOŠ, M.; ZINKIEWITZ, M.; GRZESZCZYK, M.; KAZIMIERCZUK, T.; NOGAJEWSKI, K.; PACUSKI, W.; WATANABE, K.; TANIGUCHI, T.; WYSMOŁEK, A.; KOSSACKI, P.; POTEMSKI, M.; BABINSKI, A.; MOLAS, M.

Released

10. 1. 2024

Publisher

NATURE PORTFOLIO

Location

BERLIN

ISBN

2397-7132

Periodical

npj 2D Materials and Applications

Year of study

8

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages count

7

URL

https://www.nature.com/articles/s41699-023-00438-5

Full text in the Digital Library

http://hdl.handle.net/11012/249398

BibTex

@article{BUT188959,
  author="Miroslav {Bartoš} and Malgorzata {Zinkiewitz} and Magdalena {Grzeszczyk} and Tomasz {Kazimierczuk} and Karol {Nogajewski} and Wojciech {Pacuski} and Kenji {Watanabe} and Takashi {Taniguchi} and Andrzej {Wysmołek} and Piotr {Kossacki} and Marek {Potemski} and Adam {Babinski} and Maciej {Molas}",
  title="Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides",
  journal="npj 2D Materials and Applications",
  year="2024",
  volume="8",
  number="1",
  pages="7",
  doi="10.1038/s41699-023-00438-5",
  issn="2397-7132",
  url="https://www.nature.com/articles/s41699-023-00438-5"
}