Spin-Split Band Hybridization in Graphene Proximitized with α-RuCl3 Nanosheets

• DOI: 10.1021/acs.nanolett.9b01691
• Publication Date: 2019-06-25T14:03:25Z
• Authors: Soudabeh Mashhadi; Youngwook Kim; Jeongwoo Kim; Daniel Weber; Takashi Taniguchi; Kenji Watanabe; Noejung Park; Bettina Lotsch; Jurgen H. Smet; Marko Burghard; Klaus Kern
• Keywords: Fermi energy; Topological insulator

Proximity effects induced in the two-dimensional Dirac material graphene potentially open access to novel and intriguing physical phenomena. Thus far, coupling between ferromagnetic insulators has been experimentally established. However, only very little is known about graphene's interaction with antiferromagnetic insulators. Here, we report a low-temperature study of electronic properties high quality van der Waals heterostructures composed single layer proximitized α-RuCl3. The latter become antiferromagnetically ordered below 10 K. Shubnikov-de Haas oscillations longitudinal resistance together Hall measurements provide clear evidence for band realignment that accompanied by transfer electrons originally occupying spin degenerate cones into α-RuCl3 states in-plane polarization. Left behind are holes two separate Fermi pockets, dispersion one which distorted near energy due selective hybridization these polarized states. This interpretation supported our density functional theory calculations. An unexpected damping quantum as well zero-field upturn close Néel temperature suggest onset additional scattering fluctuations