posted on 2024-01-19, 16:05authored byKaiman Lin, Xiaoxiao Sun, Florian Dirnberger, Yi Li, Jiang Qu, Peiting Wen, Zdenek Sofer, Aljoscha Söll, Stephan Winnerl, Manfred Helm, Shengqiang Zhou, Yaping Dan, Slawomir Prucnal
The layered, air-stable
van der Waals antiferromagnetic compound
CrSBr exhibits pronounced coupling among its optical, electronic,
and magnetic properties. As an example, exciton dynamics can be significantly
influenced by lattice vibrations through exciton–phonon coupling.
Using low-temperature photoluminescence spectroscopy, we demonstrate
the effective coupling between excitons and phonons in nanometer-thick
CrSBr. By careful analysis, we identify that the satellite peaks predominantly
arise from the interaction between the exciton and an optical phonon
with a frequency of 118 cm–1 (∼14.6 meV)
due to the out-of-plane vibration of Br atoms. Power-dependent and
temperature-dependent photoluminescence measurements support exciton–phonon
coupling and indicate a coupling between magnetic and optical properties,
suggesting the possibility of carrier localization in the material.
The presence of strong coupling between the exciton and the lattice
may have important implications for the design of light–matter
interactions in magnetic semiconductors and provide insights into
the exciton dynamics in CrSBr. This highlights the potential for exploiting
exciton–phonon coupling to control the optical properties of
layered antiferromagnetic materials.