Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.105
Publication date: 22nd December 2022
How physical properties change in solids with reduced dimensionalities and symmetry-breaking elements, is a scientific question that has fascinated researchers for decades. However, only the recent advances in material synthesis and nano-characterization have triggered an atomistic study of low-dimensional and topological phenomena. In this talk, I will discuss how the ultra-high-vacuum growth of two-dimensional and topological materials allows the realization of exotic physical model systems and, at the same time, grants the flexibility to perform atomic engineering to achieve functional material properties.
In the first part, I will present the long-sought thin-film realization of an inversion-symmetry breaking Weyl Semimetal [1], a recently discovered topological material class featuring a linear electronic dispersion and degeneracy (Weyl) points that lead to peculiar open-loop surface states (Fermi-Arcs). In particular, I will show how topology and electronic structure are connected to epitaxy-dependent parameters such as strain, doping and surface termination [2]. With a careful preparation of in-situ heterostructures, I will discuss how these topological properties of Weyl Semimetal thin films can be exploited for applications in spin-orbitronics and topological superconductivity.
In the second part, I will focus on the van-der-Waals epitaxy of a nearly-ideal two-dimensional magnet, a CrCl3 monolayer grown on Graphene/6H-SiC(0001). In-situ X-ray magnetic circular dichroism reveals intrinsic ferromagnetic order with easy-plane anisotropy and a 2DXY universality class [3], suggesting the first realization of a Berezinskii-Kosterlitz-Thouless (BKT) phase transition in a quasi-freestanding monolayer magnet. The important role of the van der Waals substrate interaction and the underlying crystal symmetry will be discussed, thereby highlighting routes on how to control the anisotropy of 2D magnets via growth engineering. Finally, taking advantage of our all-in-situ approach, perspectives to interface 2D magnets with other two-dimensional ferroic materials -such as ferroelectrics- will be outlined to study novel collective phenomena in van der Waals heterostructures.
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