Magneto-optical Kerr spectroscopy of exciton Rydberg states in a magnetic van der Waals heterostructure
Abstract
Excitonic states in two-dimensional semiconductors are sensitive to time-reversal symmetry breaking, yet how interfacial exchange acts on higher-lying exciton Rydberg states remains largely unexplored. Here we show that wavelength-resolved magneto-optical Kerr spectroscopy of a proximity-coupled MoSe2/Fe3GaTe2 van der Waals heterostructure resolves magnetic symmetry breaking across the A- and B-exciton manifolds. Combining reflection, photoluminescence, and photoluminescence excitation spectroscopy with first-principles many-body calculations including screening by the metallic Fe3GaTe2 layer, we assign the strongly enhanced Kerr resonances to the ground and 2s states of both manifolds. Reversing the magnetic field inverts the polarity of every resonance. A field-odd/field-even decomposition confirms a magnetic origin. The opposite Kerr polarities of the A- and B-exciton manifolds can be explained by proximity-induced exchange coupling to the opposite valence-band spins of the two exciton series. Our results establish resonant Kerr spectroscopy as a sensitive probe of magnetically induced symmetry breaking across the excitonic manifold.
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BibTeX
@misc{khandelwal2026magnetooptical,
title = {{Magneto-optical Kerr spectroscopy of exciton Rydberg states in a magnetic van der Waals heterostructure}},
author = {Astha Khandelwal and Benran Zhang and Madhusmita Jena and Zhenchao Wen and Kenji Watanabe and Takashi Taniguchi and Saroj P. Dash and Zhenglu Li and Ryo Kitaura and Bhagwati Prasad and Daichi Kozawa},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.34536},
eprint = {2609.34536},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.34536},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Magneto-optical Kerr spectroscopy of exciton Rydberg states in a magnetic van der Waals heterostructure
AU - Astha Khandelwal
AU - Benran Zhang
AU - Madhusmita Jena
AU - Zhenchao Wen
AU - Kenji Watanabe
AU - Takashi Taniguchi
AU - Saroj P. Dash
AU - Zhenglu Li
AU - Ryo Kitaura
AU - Bhagwati Prasad
AU - Daichi Kozawa
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2609.34536
UR - https://arxiv.org/abs/2609.34536
AB - Excitonic states in two-dimensional semiconductors are sensitive to time-reversal symmetry breaking, yet how interfacial exchange acts on higher-lying exciton Rydberg states remains largely unexplored. Here we show that wavelength-resolved magneto-optical Kerr spectroscopy of a proximity-coupled MoSe_2/Fe_3GaTe_2 van der Waals heterostructure resolves magnetic symmetry breaking across the A- and B-exciton manifolds. Combining reflection, photoluminescence, and photoluminescence excitation spectroscopy with first-principles many-body calculations including screening by the metallic Fe_3GaTe_2 layer, we assign the strongly enhanced Kerr resonances to the ground and 2s states of both manifolds. Reversing the magnetic field inverts the polarity of every resonance. A field-odd/field-even decomposition confirms a magnetic origin. The opposite Kerr polarities of the A- and B-exciton manifolds can be explained by proximity-induced exchange coupling to the opposite valence-band spins of the two exciton series. Our results establish resonant Kerr spectroscopy as a sensitive probe of magnetically induced symmetry breaking across the excitonic manifold.
ER -