Room-Temperature Magnetic-Induced Circularly Polarized Photoluminescence in Two-Dimensional Er2O2S

Ping Chen; Bo Peng; Zhen Liu; Jie Liu; Dongyan Li; Zexin Li; Xiang Xu; Haoyun Wang; Xing Zhou; Tianyou Zhai

doi:10.1021/jacs.3c13267

Room-Temperature Magnetic-Induced Circularly Polarized Photoluminescence in Two-Dimensional Er₂O₂S

J Am Chem Soc. 2024 Mar 6;146(9):6053-6060. doi: 10.1021/jacs.3c13267. Epub 2024 Feb 26.

Authors

Ping Chen^{1

2}, Bo Peng³, Zhen Liu³, Jie Liu¹, Dongyan Li¹, Zexin Li¹, Xiang Xu¹, Haoyun Wang¹, Xing Zhou¹, Tianyou Zhai¹

Affiliations

¹ State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
² School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China.
³ National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China.

PMID: 38404063
DOI: 10.1021/jacs.3c13267

Abstract

Two-dimensional (2D) materials with spin polarization have great potential for achieving next-generation spintronic applications. However, spin polarization of 2D materials is usually produced at a cryogenic temperature because of thermal fluctuations, which severely hinder their further applications. Here, we report room-temperature intrinsic magnetic-induced circularly polarized photoluminescence (PL) in 2D Er₂O₂S flakes. The g_eff factor of 2D Er₂O₂S stays at around -6.3 from the liquid He temperature limit to room temperature, which is independent of temperature. This anomalous phenomenon in Er₂O₂S is totally different from previous materials, which all have a decreasing Zeeman splitting with increasing temperature resulting from thermal fluctuations. The anomalous temperature-dependent magnetic-induced circularly polarized PL originates from the weak electron-phonon coupling in 2D Er₂O₂S, which has been proven by both the temperature-dependent Raman and theoretical calculations. This work sheds light on the understanding and manipulation of 2D materials for practical spintronic applications.