The coupling between the interlayer magnetic order and Davydov splitting modes in few-layer CrI3

Wu，Xiaohua1; Zhang，Yujun2; Wang，Qiaoming3; Li，Gaomin4; Pei，Shenghai5; Chen，Shoujing1; Chen，Junyang1; Zhao，Yue1,3; Huang，Mingyuan1

2023-07-31

10.1063/5.0160692

Applied Physics Letters   Impact Factor & Quartile

0003-6951

1077-3118

The magnetic order in 2D material CrI has a significant impact on the Raman polarization selection rules of phonons, as evidenced by magneto-optical Raman spectroscopy. In a monolayer, the forbidden Raman scattering of A mode can be detected in the XY channel at low temperatures. However, in the bilayer, the A mode splits into two modes, and the selection rules of the splitting modes are determined by the magnetic order and symmetry. In contrast, the inversion symmetry of the spin structure is maintained in both antiferromagnetic (AFM) and ferromagnetic (FM) states in the trilayer (3L) CrI, and the evolution of its Raman scattering with magnetic field is not yet clear. In this work, we use magneto-optical polarized Raman spectroscopy and reflective magnetic circular dichroism to investigate the Davydov splitting of the A phonon mode and its coupling to layered magnetism in 2-5L CrI. Our results show that the Raman scattering of the A mode is strongly coupled to the layered magnetic order, indicating strong spin-phonon coupling in CrI. Our study might shed light on the research on interaction between magnetic and vibrational properties of 2D magnetic materials and provide important implications for developing novel 2D spintronic devices.

SCI

English

NI Journal Papers

First ; Corresponding

National Natural Science Foundation of China["12074165","12104204","11674150"] ; Science, Technology and Innovation Commission of Shenzhen Municipality[20200925152344006] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06D348]

Physics

Physics, Applied

WOS:001042281800001

AIP Publishing

PHYSICS

2-s2.0-85167627435

Scopus

1.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.School of Physics and Astronomy,Key Lab of Quantum Information of Yunnan Province,Yunnan University,Kunming,650091,China
3.Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.College of Integrated Circuits and Optoelectronic Chips,Shenzhen Technology University,Shenzhen,Guangdong,518118,China
5.Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology,Chengdu,610054,China

Wu，Xiaohua,Zhang，Yujun,Wang，Qiaoming,et al. The coupling between the interlayer magnetic order and Davydov splitting modes in few-layer CrI3[J]. Applied Physics Letters,2023,123(5).

Wu，Xiaohua.,Zhang，Yujun.,Wang，Qiaoming.,Li，Gaomin.,Pei，Shenghai.,...&Huang，Mingyuan.(2023).The coupling between the interlayer magnetic order and Davydov splitting modes in few-layer CrI3.Applied Physics Letters,123(5).

Wu，Xiaohua,et al."The coupling between the interlayer magnetic order and Davydov splitting modes in few-layer CrI3".Applied Physics Letters 123.5(2023).