Interfacial coupling is one of the keys to manipulating magnetic/nonmagnetic two-dimensional (2D) heterostructures for novel functionalities. The MnPSe₃/graphene heterostructure is a prospective platform for quantum information and metrology. However, how graphene affects MnPSe₃ through interfacial coupling is still poorly understood. Herein, second-harmonic generation (SHG) of antiferromagnet MnPSe₃ in the MnPSe₃/graphene heterostructure is revealed. Surprisingly, it was found that below T_N, nonreciprocal or c-type SHG of MnPSe₃ 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 MnPSe₃ in the MnPSe₃/graphene heterostructure. This study will improve our understanding of the manipulation of nonlinear optical properties in 2D heterostructures.

中文翻译：

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由于界面磁振子-等离激元耦合，抑制了 MnPSe3/石墨烯异质结构中反铁磁体 MnPSe3 的非互易二次谐波产生


界面耦合是操纵磁性/非磁性二维 （2D） 异质结构以获得新功能的关键之一。_{MnPSe 3}/石墨烯异质结构是量子信息和计量学的前瞻性平台。然而，石墨烯如何通过界面耦合影响_{MnPSe 3} 仍然知之甚少。本文揭示了_{MnPSe 3}/石墨烯异质结构中反铁磁体 MnPSe₃ 的二次谐波产生 （SHG）。令人惊讶的是，结果发现，在 T_N 以下，MnPSe₃ 的非互易或 c 型 SHG 在与石墨烯界面时消失，表明存在界面耦合和/或相互作用。最有趣的是，与短程界面接近相互作用不同，这种界面相互作用可以是非接触式和长距离的，并且从 2D 金属/半导体到绝缘底层不等。界面磁振子-等离激元耦合可能在抑制 MnPSe₃/石墨烯异质结构中 MnPSe₃ 的 c 型 SHG 信号中发挥重要作用。这项研究将提高我们对二维异质结构中非线性光学特性操纵的理解。