A analysis group not too long ago 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 position of interfacial magnon-plasmon coupling on this phenomenon.
2D van der Waals magnetic/non-magnetic heterojunctions maintain vital promise for spintronic gadgets. Attaining these functionalities hinges on the interfacial proximity impact, a important issue. Nevertheless, detecting the proximity impact in 2D antiferromagnetic/non-magnetic heterojunctions presents appreciable challenges, because of the small measurement and weak alerts related to these constructions.
On this examine, the group used a home-made SHG system to watch that the nonreciprocal SHG of MnPSe₃ disappeared when it was in touch 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 an extended vary (>40 nm), considerably surpassing the standard vary of some nanometers usually noticed in proximity results.
Furthermore, the group discovered that the energy of this coupling weakened because the band hole of the underlayer materials elevated, offering a strategy to tune the nonlinear SHG response. By means of symmetry evaluation, first-principles calculations, and comparability with earlier research, the researchers concluded that the disappearance of the nonreciprocal SHG sign was because of the 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 growing multifunctional, tunable 2D layered nonlinear optical gadgets,” 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 data:
Ziyun Wang et al, Suppressed Nonreciprocal Second-Harmonic Era of Antiferromagnet MnPSe₃ within the MnPSe₃/Graphene Heterostructure As a result of Interfacial Magnon–Plasmon Coupling, Nano Letters (2024). DOI: 10.1021/acs.nanolett.4c04184
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Chinese language Academy of Sciences
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Dance of magnetism and light-weight: Research finds nonreciprocal second harmonic era disappears in 2D materials (2025, February 14)
retrieved 14 February 2025
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