Magnetic 2D materials and heterostructures

Abstract

The family of 2D materials grows day by day, drastically expanding the scope of possible phenomena to be explored in two dimensions, as well as the possible van der Waals heterostructures that one can create. Such 2D materials currently cover a vast range of properties. Until recently, this family has been missing one crucial member -2D magnets. The situation has changed over the last two years with the introduction of a variety of atomically-thin magnetic crystals. Here we will discuss the difference between magnetic states in 2D materials and in bulk crystals and present an overview of the 2D magnets that have been explored recently. We will focus, in particular, on the case of the two most studied systems -semiconducting CrI3 and metallic Fe3GeTe2 -and illustrate the physical phenomena that have been observed. Special attention will be given to the range of novel van der Waals heterostructures that became possible with the appearance of 2D magnets, offering new perspectives in this rapidly expanding field.

The Optical Properties and Plasmonics of Anisotropic 2D Materials

“…The weak vdWs interlayer force in 2D materials makes it possible to isolate 2D films and restack them into arbitrary stacking heterojunctions without the restriction of the lattice match . By stacking 2D materials with different functions, one can achieve new features that are not available in each individual component.…”

Phonon Polaritons and Hyperbolic Response in van der Waals Materials

“…Following the trend of polariton hybrids in hBN/graphene and hBN/phase change materials, more nanophotonic properties are envisioned to be engineered in vdW heterostructures. In particular, atomic plane assembling, twisting and other new schematics can implement intriguing physical properties to hybrid polaritons, including superconductivity, topological protected states, and 2D magnetism 2)Hyperbolic phonon polaritons for emission engineering, nonlinear, and quantum optics.…”

“…In particular, atomic plane assembling, twisting and other new schematics can implement intriguing physical properties to hybrid polaritons, including superconductivity, [124,125] topological protected states, [126] and 2D magnetism. [127] 2) Hyperbolic phonon polaritons for emission engineering, nonlinear, and quantum optics. Strong field enhancement, confinement and the boosted optical density of states make hyperbolic phonon polaritonic systems ideal for enhancing the emission and energy transfer.…”

Van der Waals magnets: Wonder building blocks for two‐dimensional spintronics?

“…This enables ample opportunities for exciting studies of 2D and monolayer magnetism. Furthermore, the active spins interplay with other electronic degrees of freedom, as well as with exotic quantum phenomena, such as charge density wave (CDW), superconductivity, and topological order . Heterostructures and devices based on 2D‐vdW magnets are expected to possess a great variety of properties with strong application potential.…”