A analysis group just lately found the disappearance of nonreciprocal second harmonic era (SHG) in MnPSe₃ when built-in right into a two-dimensional (2D) antiferromagnetic MnPSe₃/graphene heterojunction.
The analysis, printed in Nano Letters, highlights the function of interfacial magnon-plasmon coupling on this phenomenon.
2D van der Waals magnetic/non-magnetic heterojunctions maintain vital promise for spintronic units. Attaining these functionalities hinges on the interfacial proximity impact, a important issue. Nonetheless, detecting the proximity impact in 2D antiferromagnetic/non-magnetic heterojunctions presents appreciable challenges, as a result of small measurement and weak alerts related to these buildings.
On this examine, the staff used a home-made SHG system to watch that the nonreciprocal SHG of MnPSe₃ disappeared when it was involved with graphene, in distinction to the antiferromagnetic MnPSe₃ layer alone. This alteration signifies the presence of interfacial coupling interplay or proximity impact.
To discover this impact additional, the researchers integrated a hexagonal boron nitride (h-BN) layer between the MnPSe₃ and graphene to isolate the interfacial interplay. Their experiments revealed that the interfacial coupling prolonged over a protracted vary (>40 nm), considerably surpassing the everyday vary of some nanometers usually noticed in proximity results.
Furthermore, the staff discovered that the energy of this coupling weakened because the band hole of the underlayer materials elevated, offering a solution to tune the nonlinear SHG response. By way of symmetry evaluation, first-principles calculations, and comparability with earlier research, the researchers concluded that the disappearance of the nonreciprocal SHG sign was as a result of coupling between graphene’ s floor plasmons and MnPSe₃’ s magnons.
“This discovery paves the best way for manipulating the nonlinear optical properties of 2D heterojunctions and creating multifunctional, tunable 2D layered nonlinear optical units,” stated Prof. Sheng Zhigao.
The examine was led by Prof. Sheng from the Hefei Institutes of Bodily Science of the Chinese language Academy of Science.
Extra info:
Ziyun Wang et al, Suppressed Nonreciprocal Second-Harmonic Era of Antiferromagnet MnPSe₃ within the MnPSe₃/Graphene Heterostructure On account of Interfacial Magnon–Plasmon Coupling, Nano Letters (2024). DOI: 10.1021/acs.nanolett.4c04184
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Dance of magnetism and light-weight: Examine finds nonreciprocal second harmonic era disappears in 2D materials (2025, February 14)
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