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.

accepted to APL

References in corpus (8)

• Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers
• Spin-Orbit Proximity Effect in Graphene
• Magnetic Insulator-Induced Proximity Effects in Graphene: Spin Filtering and Exchange Splitting Gaps
• Electronic properties of graphene hexagonal boron nitride moiré superlattice
• Spin-orbit driven band inversion in bilayer graphene by van der Waals proximity effect
• Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
• Spin-split band hybridization in graphene proximitized with $\alpha$-RuCl${}_3$ nanosheets
• Band Gap Opening in Bilayer Graphene-CrCl${}_3$/CrBr${}_3$/CrI${}_3$ van der Waals Interfaces

Cited by in corpus (1)

• Ferroelectric switching of interfacial dipoles in $\alpha$-RuCl${}_3$/graphene heterostructure