Publication detail

Ultrafast Dynamics of Valley-Polarized Excitons in WSe2 Monolayer Studied by Few-Cycle Laser Pulses

KOUTENSKÝ, P. SLOBODENIUK, A. BARTOŠ, M. TROJÁNEK, F. MALÝ, P. KOZÁK, M.

Original Title

Ultrafast Dynamics of Valley-Polarized Excitons in WSe2 Monolayer Studied by Few-Cycle Laser Pulses

Type

journal article in Web of Science

Language

English

Original Abstract

We report on the experimental investigation of the ultrafast dynamics of valley-polarized excitons in monolayer WSe (Formula presented.) using transient reflection spectroscopy with few-cycle laser pulses with 7 fs duration. We observe that at room temperature, the anisotropic valley population of excitons decays on two different timescales. The shorter decay time of approximately 120 fs is related to the initial hot exciton relaxation related to the fast direct recombination of excitons from the radiative zone, while the slower picosecond dynamics corresponds to valley depolarization induced by Coloumb exchange-driven transitions of excitons between two inequivalent valleys

Keywords

transition metal dichalcogenide monolayers; femtosecond transient reflection spectroscopy; intravalley excitons dynamics

Authors

KOUTENSKÝ, P.; SLOBODENIUK, A.; BARTOŠ, M.; TROJÁNEK, F.; MALÝ, P.; KOZÁK, M.

Released

28. 3. 2023

Publisher

MDPI

ISBN

2079-4991

Periodical

Nanomaterials

Year of study

13

Number

7

State

Swiss Confederation

Pages from

1

Pages to

14

Pages count

14

URL

https://www.mdpi.com/2079-4991/13/7/1207

Full text in the Digital Library

http://hdl.handle.net/11012/213579

BibTex

@article{BUT183439,
  author="Petr {Koutenský} and Artur {Slobodeniuk} and Miroslav {Bartoš} and František {Trojánek} and Petr {Malý} and Martin {Kozák}",
  title="Ultrafast Dynamics of Valley-Polarized Excitons in WSe2 Monolayer Studied by Few-Cycle Laser Pulses",
  journal="Nanomaterials",
  year="2023",
  volume="13",
  number="7",
  pages="1--14",
  doi="10.3390/nano13071207",
  issn="2079-4991",
  url="https://www.mdpi.com/2079-4991/13/7/1207"
}