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Terahertz Emission on the Surface of a van der Waals Magnet CrSiTe3
Laser & Photonics Reviews ( IF 11.0 ) Pub Date : 2020-05-28 , DOI: 10.1002/lpor.202000025
Peng Suo 1 , Wei Xia 2 , Wenjie Zhang 1 , Xiaoqing Zhu 1 , Jibo Fu 1 , Xian Lin 1 , Zuanming Jin 1, 3 , Weimin Liu 2, 3 , Yanfeng Guo 2, 3 , Guohong Ma 1, 3
Affiliation  

The van der Waals magnet CrSiTe3 (CST) has captured immense interest because it is capable of retaining the long‐range ferromagnetic order even in its monolayer form, thus offering potential use in spintronic devices. Bulk CST crystal has inversion symmetry that is broken on the crystal surface. Here, by employing ultrafast terahertz (THz) emission spectroscopy and time resolved THz spectroscopy, the THz emission of the CST crystal is investigated, which shows a strong THz emission from the crystal surface under femtosecond (fs) pulse excitation at 800 nm. Theoretical analysis based on space symmetry of CST suggests the dominant role of shift current occurring on the surface with a thickness of a few quintuple layers in producing the THz emission, consistent with the experimental observation that the emitted THz amplitude strongly depends on the azimuthal and pumping polarization angles. This study offers a new efficient THz emitter as well as a better understanding of the nonlinear optical response of CST. It hopefully will open a window toward the investigation on the nonlinear optical response in the mono/few‐layer van der Waals crystals with low‐dimensional magnetism.

中文翻译:

范德华磁铁CrSiTe3表面的太赫兹发射

范德华磁铁CrSiTe 3CST(CST)引起了极大的兴趣,因为它甚至能够以单层形式保留远距离铁磁有序,因此在自旋电子器件中具有潜在的用途。大块CST晶体具有在晶体表面破碎的反型对称性。在这里,通过使用超快太赫兹(THz)发射光谱和时间分辨THz光谱,研究了CST晶体的THz发射,这表明在800 nm的飞秒(fs)脉冲激发下,晶体表面有很强的THz发射。基于CST的空间对称性的理论分析表明,在产生THz发射的过程中,厚度为几倍五层的表面上发生的移位电流占主导地位,与实验观察结果一致,即所发射的太赫兹幅度强烈取决于方位角和泵浦极化角。这项研究提供了一种新型的高效THz发射器以及对CST非线性光学响应的​​更好理解。希望它将为研究具有低维磁性的单层/几层范德华晶体中的非线性光学响应打开一个窗口。
更新日期:2020-05-28
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