The Groundbreaking Research on Nonlinear Magnetic Second Harmonic Generation in Monolayer CrPS4

The Groundbreaking Research on Nonlinear Magnetic Second Harmonic Generation in Monolayer CrPS4

In a pioneering study led by Professor Sheng Zhigao at the Hefei Institutes of Physical Science of the Chinese Academy of Sciences, a team of researchers has made a significant breakthrough in the field of nonlinear magnetic second harmonic generation (MSHG). This research sheds light on the previously unexplored link between magnetic order and second harmonic generation in two-dimensional antiferromagnetic materials, specifically focusing on monolayer CrPS4.

Second harmonic generation (SHG) is a nonlinear optical effect that is sensitive to symmetry breaking in materials. Traditionally, SHG has been observed in crystals with broken symmetry (i type) and magnetic systems (c type), although the latter is typically weaker. This limitation has hindered the potential applications of SHG in optical devices.

The research team delved deep into the magnetic order-related SHG effects in monolayer CrPS4. Surprisingly, they discovered that in the bulk and even-layered forms of CrPS4, the antiferromagnetic order did not induce any significant c type SHG effects. However, a remarkable c type SHG effect was observed in odd-layered CrPS4 with ferromagnetic order, marking a significant breakthrough in the field.

This groundbreaking observation of ferromagnetic order-induced c type SHG effects in a two-dimensional magnet has profound implications. The dual breaking of spatial and time inversion symmetries in monolayer CrPS4 contributes to the strength of the SHG signal, comparable to that of i type SHG arising from the breaking of crystal structural symmetry. Such a finding is exceedingly rare among known magnetic materials and opens up new possibilities in the realm of optoelectronics.

The research conducted by Professor Sheng Zhigao and his team represents a major advancement in the understanding of nonlinear magnetic second harmonic generation in two-dimensional antiferromagnetic materials. By elucidating the connection between magnetic order and SHG effects in monolayer CrPS4, this study paves the way for future research in the field of optoelectronics and nonlinear optical materials.

Physics

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