Ferroelectric control of pseudospin texture in CuInP2S6monolayer

Jun-Ding Zheng; Yi-Feng Zhao; He Hu; Yu-Hao Shen; Yi-Fan Tan; Wen-Yi Tong; Ping-Hua Xiang; Ni Zhong; Fang-Yu Yue; Chun-Gang Duan

doi:10.1088/1361-648X/ac577d

Ferroelectric control of pseudospin texture in CuInP₂S₆monolayer

J Phys Condens Matter. 2022 Mar 10;34(20). doi: 10.1088/1361-648X/ac577d.

Authors

Jun-Ding Zheng¹, Yi-Feng Zhao¹, He Hu¹, Yu-Hao Shen¹, Yi-Fan Tan¹, Wen-Yi Tong¹, Ping-Hua Xiang¹, Ni Zhong¹, Fang-Yu Yue¹, Chun-Gang Duan^{1

2}

Affiliations

¹ Key Laboratory of Polar Materials and Devices (MOE), Ministry of Education, Department of Electronics, East China Normal University, Shanghai, 200241, People's Republic of China.
² Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.

PMID: 35193130
DOI: 10.1088/1361-648X/ac577d

Abstract

Spin-orbit coupling (SOC) plays an important role in condensed matter physics and has potential applications in spintronics devices. In this paper, we study the electronic properties of ferroelectric CuInP₂S₆(CIPS) monolayer through first-principles calculations. The result shows that CIPS monolayer is a potential for valleytronics material and we find that the in-plane helical and nonhelical pseudospin texture are induced by the Rashba and Dresselhaus effect, respectively. The chirality of helical pseudospin texture is coupled to the out-of-plane ferroelectric polarization. Furthermore, a large spin splitting due to the SOC effect can be found atKvalley, which can be regarded as the Zeeman effect under a valley-dependent pseudomagnetic field. The CIPS monolayer with Rashbaet aleffects provides a good platform for electrically controlled spin polarization physics.

Keywords: CuInP2S6; ferroelectric control; pseudospin texture.