Room-temperature antiferromagnetic CrSe monolayer with tunable metal-insulator transition in ferroelectric heterostructures

Abstract

Recently, there has been a rapidly growing interest in two-dimensional (2D) transition metal chalcogenide monolayers (MLs) due to their unique magnetic and electronic properties. By using an evolutionary algorithm and first-principles calculations, we report the discovery of a previously unexplored, chemically, energetically, and thermodynamically stable 2D antiferromagnetic (AFM) CrSe ML with a Néel temperature higher than room temperature. Remarkably, we predict an electric field-controllable metal-insulator transition (MIT) in a van der Waals (vdW) heterostructure comprised of CrSe ML and ferroelectric Sc2CO2. This tunable transition in CrSe/Sc2CO2 heterostructure is attributed to the change in the band alignment between CrSe and Sc2CO2 caused by the ferroelectric polarization reversal in Sc2CO2. Our findings suggest that 2D AFM CrSe ML has important potential applications in AFM spintronics, particularly in the gate voltage conducting channel.

13 Pages, 4 Figures, published at Applied Physics Letters

References in corpus (6)

• 2D materials and van der Waals heterostructures
• Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures
• Relativistic exchange interactions in CrX${}_3$ (X=Cl, Br, I) monolayers
• Multiferroic van der Waals heterostructure FeCl${}_2$/Sc${}_2$CO${}_2$: Nonvolatile electrically switchable electronic and spintronic properties
• Biquadratic and ring exchange interactions in orthorhombic perovskite manganites
• Distinctive magnetic properties of CrI3 and CrBr3 monolayers caused by spin-orbit coupling