Photo-magnetization in two-dimensional sliding ferroelectrics

Abstract

Light-matter interaction is one of the key routes to understanding and manipulating geometric and electronic behaviors of materials, especially two-dimensional materials which are optically accessible owing to their high surface to volume ratio. In the current work we focus on the recently discovered two-dimensional sliding ferroelectric materials, in which the out-of-plane electric polarization can be switched with a small horizontal translation in one layer. Combining symmetry analysis and first-principles calculations, we predict that light illumination could inject non-equilibrium magnetic moments into the sliding ferroelectrics. Such magnetic moment is composed of both spin and orbital degrees of freedom contributions. We use ${\mathrm{ZrI}}_2$, ${\mathrm{WTe}}_2$, and ${\mathrm{MoS}}_2$ bilayer ferroelectrics to illustrate our theory. Under intermediate light illumination, one can yield non-equilibrium magnetic moments on the order of $0.1-1$ ${\mu }_B$ in these systems, which also depends on the polarization nature of incident light. Furthermore, we show that such photo-injected magnetism changes its sign when the sliding dipole moment switches. This photo-magnetization can be detected by magneto-optical methods (such as Kerr or Faraday effect), which serves as an indicator of sliding ferroelectricity. Hence, one can use an all-optical pump and probe setup to measure and detect the subtle sliding ferroelectric phase.

arXiv comment6 figures, under peer review

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Cited by in corpus (7)

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• Emergent properties of van der Waals bilayers revealed by computational stacking
• Spin and Orbital Magnetism by Light in Rutile Altermagnets
• Orbital Rashba effect as a platform for robust orbital photocurrents
• Quasi-one-dimensional sliding ferroelectricity in NbI${}_4$
• Nonlinear optics driven magnetism reorientation in semiconductors
• Light-induced Orbital and Spin Magnetism in $3d$, $4d$, and $5d$ Transition Metals