Strong Exciton-Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Research output: Contribution to journalResearch articleContributedpeer-review


  • Kaiman Lin - , University of Michigan-Shanghai Jiao Tong University Joint Institute, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Xiaoxiao Sun - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Florian Dirnberger - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Chair of Ultrafast Microscopy and Photonics (ct.qmat) (Author)
  • Yi Li - , Helmholtz-Zentrum Dresden-Rossendorf, TUD Dresden University of Technology (Author)
  • Jiang Qu - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Peiting Wen - , Chair of Semiconductor Spectroscopy, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Zdenek Sofer - , University of Chemistry and Technology, Prague (Author)
  • Aljoscha Söll - , University of Chemistry and Technology, Prague (Author)
  • Stephan Winnerl - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Manfred Helm - , Chair of Semiconductor Spectroscopy, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Shengqiang Zhou - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Yaping Dan - , University of Michigan-Shanghai Jiao Tong University Joint Institute (Author)
  • Slawomir Prucnal - , Helmholtz-Zentrum Dresden-Rossendorf (Author)


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.


Original languageEnglish
Pages (from-to)2898-2905
Number of pages8
JournalACS nano
Volume18 (2024)
Issue number4
Publication statusPublished - 19 Jan 2024

External IDs

PubMed 38240736



  • antiferromagnetic semiconductor, CrSBr, exciton−phonon coupling, exciton−photon coupling, van der Waals materials