Tunable magnetism in bilayer transition metal dichalcogenides

Abstract

Twist between neighboring layers and variation of interlayer distance are two extra ways to control the physical properties of stacked two-dimensional van der Waals materials without alteration of chemical compositions or application of external fields, compared to their monolayer counterparts. In this work, we explored the dependence of the magnetic states of the untwisted and twisted bilayer 1T-VX${}_2$ (X = S, Se) on the interlayer distance by density functional theory calculations. We find that, while a magnetic phase transition occurs from interlayer ferromagnetism to interlayer antiferromagnetism either as a function of decreasing interlayer distance for the untwisted bilayer 1T-VX${}_2$ or after twist, richer magnetic phase transitions consecutively take place for the twisted bilayer 1T-VX${}_2$ as interlayer distance is gradually reduced. Besides, the critical pressures for the phase transition are greatly reduced in twisted bilayer 1T-VX${}_2$ compared with the untwisted case. We derived the Heisenberg model with intralayer and interlayer exchange couplings to comprehend the emergence of various magnetic states. Our results point out an easy access towards tunable two-dimensional magnets.

8 pages, 4 figures

References in corpus (5)

• Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
• Magnetic Transition in Monolayer VSe2 via Interface Hybridization
• Exotic dielectric behaviors induced by pseudo-spin texture in magnetic twisted bilayer
• Tunable band gap in twisted bilayer graphene
• Site-selective insulating phase in twisted bilayer Hubbard model

Cited by in corpus (1)

• Anomalous valley Hall effect in monolayer chromium-based triple-Q magnets