Suppressed Nonreciprocal Second-Harmonic Generation of Antiferromagnet MnPSe<sub>3</sub> in the MnPSe<sub>3</sub>/Graphene Heterostructure Due to Interfacial Magnon-Plasmon Coupling.
basic_science · Level V
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- Record sourced from PubMed, PMID 39535235.
- Also identified by DOI 10.1021/acs.nanolett.4c04184.
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Abstract
Interfacial coupling is one of the keys to manipulating magnetic/nonmagnetic two-dimensional (2D) heterostructures for novel functionalities. The MnPSe<sub>3</sub>/graphene heterostructure is a prospective platform for quantum information and metrology. However, how graphene affects MnPSe<sub>3</sub> through interfacial coupling is still poorly understood. Herein, second-harmonic generation (SHG) of antiferromagnet MnPSe<sub>3</sub> in the MnPSe<sub>3</sub>/graphene heterostructure is revealed. Surprisingly, it was found that below <i>T</i><sub>N</sub>, nonreciprocal or c-type SHG of MnPSe<sub>3</sub> disappeared when interfacing with the graphene, suggesting the existence of interfacial couplings and/or interactions. Most interestingly, different from the short-range interfacial proximity interaction, this interfacial interaction could be contactless and long-range and varied from 2D metallic/semiconducting to insulating underlayers. Interfacial magnon-plasmon coupling probably played an important role in suppressing the c-type SHG signals of MnPSe<sub>3</sub> in the MnPSe<sub>3</sub>/graphene heterostructure. This study will improve our understanding of the manipulation of nonlinear optical properties in 2D heterostructures.