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

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 Er 2 O 2 S flakes. The g eff factor of 2D Er 2 O 2 S stays at around −6.3 from the liquid He temperature limit to room temperature, which is independent of temperature. This anomalous phenomenon in Er 2 O 2 S 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 Er 2 O 2 S, 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.

From Ln2O2S to Ln10OS14: exploring the sulphur spectrum of trivalent lanthanoid oxysulphides

“…However, reports on the properties of the pure-phase heavier members (Tb–Lu) are rare. 32–34 Similarly, the higher sulphur content members of the spectrum are mostly limited to the light rare earths (up to Gd). Despite their intriguing properties, there remains a large degree of uncertainty in the landscape of lanthanoid oxysulphides and the conditions required for their synthesis as the reports on the thermodynamics of these systems are scarce.…”