Probing the Ferromagnetism and Spin Wave Gap in VI3 by Helicity-Resolved Raman Spectroscopy

被引：41

作者：

Lyu, BingBing ^{[1
]}

Gao, YiFan ^{[1
]}

Zhang, Yujun ^{[1
]}

Wang, Le ^{[2
]}

Wu, Xiaohua ^{[1
]}

Chen, Yani ^{[1
]}

Zhang, Jiasheng ^{[3
,4
]}

Li, Gaomin ^{[1
]}

Huang, Qiaoling ^{[1
]}

Zhang, Naipeng ^{[1
]}

Chen, Yuanzhen ^{[1
,2
]}

Mei, Jiawei ^{[1
,2
]}

Yan, Hugen ^{[3
,4
]}

Zhao, Yue ^{[1
,2
]}

Huang, Li ^{[1
]}

Huang, Mingyuan ^{[1
]}

机构：

[1] Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

[2] Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China

[3] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[4] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

来源：

NANO LETTERS | 2020年 / 20卷 / 08期

基金：

中国国家自然科学基金;

关键词：

2D magnets; helicity-resolved Raman spectroscopy; VI3; magnon; magneto-optical effect; MAGNETIC STATES; SCATTERING; DISCOVERY;

D O I：

10.1021/acs.nanolett.0c02029

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Circularly polarized light carries light spin angular momentum, which may lead helicity-resolved Raman scattering to be sensitive to the electronic spin configuration in magnetic materials. Here, we demonstrate that all Raman modes in the 2D ferromagnet VI3 show different scattering intensities to left and right circularly polarized light at low temperatures, which gives direct evidence of the time-reversal symmetry breaking. By measuring the circular polarization of the dominant Raman mode with respect to the temperature and magnetic field, the ferromagnetic (FM) phase transition and hysteresis behavior can be clearly resolved. Besides the lattice excitations, quasielastic scattering is detected in the paramagnetic phase, and it gradually evolves into the acoustic magnon mode at 18.5 cm(-1) in the FM state, which gives the spin wave gap that results from large magnetic anisotropy. Our findings demonstrate that helicity-resolved Raman spectroscopy is an effective tool to directly probe the ferromagnetism in 2D magnets.

引用

页码：6024 / 6031

页数：8

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