Biaxial strain tuning of exciton energy and polarization in monolayer WS2

We perform micro-photoluminescence and Raman experiments to examine the impact of biaxial tensile strain on the optical properties of WS2 monolayers. A strong shift on the order of −130 meV per % of strain is observed in the neutral exciton emission at room temperature. Under near-resonant excitatio...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2023-11, Vol.123 (22)
Main Authors: Kourmoulakis, G., Michail, A., Paradisanos, I., Marie, X., Glazov, M. M., Jorissen, B., Covaci, L., Stratakis, E., Papagelis, K., Parthenios, J., Kioseoglou, G.
Format: Article
Language:English
Subjects:
Applied physics
Circular polarization
Excitons
Monolayers
Optical properties
Photoluminescence
Room temperature
Strain analysis
Tensile strain
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We perform micro-photoluminescence and Raman experiments to examine the impact of biaxial tensile strain on the optical properties of WS2 monolayers. A strong shift on the order of −130 meV per % of strain is observed in the neutral exciton emission at room temperature. Under near-resonant excitation, we measure a monotonic decrease in the circular polarization degree under the applied strain. We experimentally separate the effect of the strain-induced energy detuning and evaluate the pure effect coming from the biaxial strain. The analysis shows that the suppression of the circular polarization degree under the biaxial strain is related to an interplay of energy and polarization relaxation channels as well as to variations in the exciton oscillator strength affecting the long-range exchange interaction.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0167724