Electric-field-enhanced second-harmonic domain contrast and nonreciprocity in a van der Waals antiferromagnet

Ziqian Wang (), Meng Wang, Jannis Lehmann, Yuki Shiomi, Taka-hisa Arima, Naoto Nagaosa, Yoshinori Tokura and Naoki Ogawa
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Ziqian Wang: RIKEN Center for Emergent Matter Science (CEMS)
Meng Wang: RIKEN Center for Emergent Matter Science (CEMS)
Jannis Lehmann: RIKEN Center for Emergent Matter Science (CEMS)
Yuki Shiomi: University of Tokyo
Taka-hisa Arima: RIKEN Center for Emergent Matter Science (CEMS)
Naoto Nagaosa: RIKEN Center for Emergent Matter Science (CEMS)
Yoshinori Tokura: RIKEN Center for Emergent Matter Science (CEMS)
Naoki Ogawa: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Imaging antiferromagnetic 180° domains with actively controlled visibility is vital for both fundamental science and sophisticated applications. While optical second-harmonic generation (SHG) is a well-known technique for distinguishing such domains in non-centrosymmetric antiferromagnets, a general material-based strategy to control domain contrast remains elusive. Using van der Waals antiferromagnet MnPS3 as a proof of concept, we demonstrate the tuning of nonreciprocity-induced domain contrast in SHG through applying an in-plane electric field that transforms the magnetic point group to its unitary subgroup. The interference among intrinsic electric-dipole, magnetic-dipole, and field-induced electric-dipole transitions, each carrying distinct characters under space-inversion ( $${{\mathcal{P}}}$$ P ) and time-reversal ( $${{\mathcal{T}}}$$ T ) operations, enables large tuning of domain contrast and nonreciprocity in a broad spectral range. This strategy, generically applicable to systems characterized by $${{\mathcal{P}}}{{\mathcal{T}}}$$ P T -symmetric magnetic groups with a polar unitary subgroup, offers a path to fast electrical modulation of nonlinear nonreciprocal photonic behaviors using antiferromagnets.

Date: 2024
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DOI: 10.1038/s41467-024-51943-0

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