Optical observation of interlayer spin correlation

Abstract

Spin correlations govern numerous collective behaviors of quantum materials, underpinning exotic phenomena such as unconventional superconductivity and topological magnetism. In layered materials, the interlayer spin correlation is important because it characterizes the magnetic ground state and determines spin transport across the interface. Yet interlayer spin correlations have remained hard to measure directly, leaving one of the most basic quantities of two-dimensional magnetism out of experimental reach. Here we provide the first direct optical probe of interlayer spin correlations, using two-magnon Raman scattering in the van der Waals antiferromagnet (AFM) CrSBr, in remarkable agreement with a microscopic spin-wave model without any fitting parameter. Moreover, the two-magnon channel switches on only in the AFM state and vanishes when a magnetic field takes the crystal to a ferromagnetic state. We furthermore establish an exciton-mediated variant of the technique, where tuning the laser near the exciton resonance enhances the signal roughly tenfold due to the exciton's large oscillator strength. Magnon-pair Raman spectroscopy thus opens a direct optical window into interlayer spin correlations in van der Waals magnets, extendable to twisted bilayers and proximity-coupled heterostructures.

Orbital-Selective Coexistence of Interlayer Spin-Singlet Formation and SDW Order with Anomalous Spin Reconfiguration in Bilayer Nickelate La₃Ni₂O₇ Revealed by ¹⁷O-NMR
H. Lee, M. Yashima, M. Kakoi +7
arXiv28 Aug 2026PreprintarXiv licenceFull textCondensed matterarXiv
Observation of a supersolid phase in a spin-orbit coupled exciton-polariton Bose-Einstein condensate
Marcin Muszyński, Pavel Kokhanchik, Rafał Mirek +18
Science Advances16 Oct 2026Peer-reviewedCC BYFull textAtomic, molecular & optical physicsCrossrefEurope PMC
Observation of multipartite spin entanglement in a cuprate chain
S. F. R. TenHuisen, Z. Shen, V. Bhartiya +17
Physical Review X27 Oct 2026Peer-reviewedPublisher termsAtomic, molecular & optical physicsCrossref
Classification and correlation signatures of chiral spin liquids on the pyrochlore lattice
Chunxiao Liu, Leon Balents, Yasir Iqbal
Reports on Progress in Physics5 Nov 2026Peer-reviewedLicence not statedFull textCondensed matterHAL
Singular observation of shape and spin hindrance in metastable nuclear decay of ¹⁹⁷Au
S. K. Tandel, D. Rathore, M. Hemalatha +8
arXiv19 Oct 2026PreprintCC BY 4.0Full textNuclear physicsarXiv

Cite

BibTeX RIS

BibTeX

@misc{park2026optical,
  title = {{Optical observation of interlayer spin correlation}},
  author = {Akiyoshi Park and Pranshoo Upadhyay and Andrey Grankin and Emil Viñas Boström and Mahdi Ghafariasl and Hassan Alnatah and Masoud Mohammadi-Arzanagh and Gautam Nambiar and Beini Gao and Alireza Alvandi and Sakthi Rajmano Madhan Kumar and Ghadah Alshalan and Isaac Sherwood and Mahmoud Jalali Mehrabad and You Zhou and Arun Ramanathan and Xavier Roy and Angel Rubio and Mohammad Hafezi},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.38825},
  eprint = {2609.38825},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.38825},
}

RIS

TY  - UNPB
TI  - Optical observation of interlayer spin correlation
AU  - Akiyoshi Park
AU  - Pranshoo Upadhyay
AU  - Andrey Grankin
AU  - Emil Viñas Boström
AU  - Mahdi Ghafariasl
AU  - Hassan Alnatah
AU  - Masoud Mohammadi-Arzanagh
AU  - Gautam Nambiar
AU  - Beini Gao
AU  - Alireza Alvandi
AU  - Sakthi Rajmano Madhan Kumar
AU  - Ghadah Alshalan
AU  - Isaac Sherwood
AU  - Mahmoud Jalali Mehrabad
AU  - You Zhou
AU  - Arun Ramanathan
AU  - Xavier Roy
AU  - Angel Rubio
AU  - Mohammad Hafezi
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2609.38825
UR  - https://arxiv.org/abs/2609.38825
AB  - Spin correlations govern numerous collective behaviors of quantum materials, underpinning exotic phenomena such as unconventional superconductivity and topological magnetism. In layered materials, the interlayer spin correlation is important because it characterizes the magnetic ground state and determines spin transport across the interface. Yet interlayer spin correlations have remained hard to measure directly, leaving one of the most basic quantities of two-dimensional magnetism out of experimental reach. Here we provide the first direct optical probe of interlayer spin correlations, using two-magnon Raman scattering in the van der Waals antiferromagnet (AFM) CrSBr, in remarkable agreement with a microscopic spin-wave model without any fitting parameter. Moreover, the two-magnon channel switches on only in the AFM state and vanishes when a magnetic field takes the crystal to a ferromagnetic state. We furthermore establish an exciton-mediated variant of the technique, where tuning the laser near the exciton resonance enhances the signal roughly tenfold due to the exciton's large oscillator strength. Magnon-pair Raman spectroscopy thus opens a direct optical window into interlayer spin correlations in van der Waals magnets, extendable to twisted bilayers and proximity-coupled heterostructures.
ER  -

Abstract

Related

Cite