Spin and Valley Polarized Multiple Fermi Surfaces of α-RuCl${}_3$/Bilayer Graphene Heterostructure

Abstract

We report the transport properties of $\alpha$-RuCl${}_3$/bilayer graphene heterostructures, where carrier doping is induced by a work function difference, resulting in distinct electron and hole populations in $\alpha$-RuCl3 and bilayer graphene, respectively. Through a comprehensive analysis of multi-channel transport signatures, including Hall measurements and quantum oscillation, we unveil significant band modifications within the system. In particular, we observe the emergence of spin and valley polarized multiple hole-type Fermi pockets, originating from the spin-selective band hybridization between $\alpha$-RuCl${}_3$ and bilayer graphene, breaking the spin degree of freedom. Unlike $\alpha$-RuCl${}_3$ /monolayer graphene system, the presence of different hybridization strengths between $\alpha$-RuCl${}_3$ and the top and bottom graphene layers leads to an asymmetric behavior of the two layers, confirmed by effective mass experiments, resulting in the manifestation of valley-polarized Fermi pockets. These compelling findings establish $\alpha$-RuCl${}_3$ proximitized to bilayer graphene as an outstanding platform for engineering its unique low-energy band structure.

arXiv commentaccepted to APL

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