Transport Spectroscopy of Sublattice-Resolved Resonant Scattering in Hydrogen-Doped Bilayer Graphene

Abstract

We report the experimental observation of sublattice-resolved resonant scattering in bilayer graphene by performing simultaneous cryogenic atomic hydrogen doping and electron transport measurements in ultrahigh vacuum. This allows us to monitor the hydrogen adsorption on the different sublattices of bilayer graphene without atomic-scale microscopy. Specifically, we detect two distinct resonant scattering peaks in the gate-dependent resistance, which evolve as a function of atomic hydrogen dosage. Theoretical calculations show that one of the peaks originates from resonant scattering by hydrogen adatoms on the α-sublattice (dimer site) while the other originates from hydrogen adatoms on the \b{eta}-sublattice (non-dimer site), thereby enabling a method for characterizing the relative sublattice occupancy via transport measurements. Utilizing this new capability, we investigate the adsorption and thermal desorption of hydrogen adatoms via controlled annealing and conclude that hydrogen adsorption on the \b{eta}-sublattice is energetically favored. Through site-selective desorption from the α-sublattice, we realize hydrogen doping with adatoms primarily on a single sublattice, which is highly desired for generating ferromagnetism.

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Cited by in corpus (10)

• Defect-induced magnetism and Yu-Shiba-Rusinov states in twisted bilayer graphene
• Electronic structure and quantum transport in twisted bilayer graphene with resonant scatterers
• Sublattice dependence and gate-tunability of midgap and resonant states induced by native dopants in Bernal-stacked bilayer graphene
• Enhancement of spin-orbit coupling and magnetic scattering in hydrogenated graphene
• Breakdown of the Hebel-Slichter effect in superconducting graphene due to the emergence of Yu-Shiba-Rusinov states at magnetic resonant scatterers
• Interplay of resonant states and Landau levels in functionalized graphene
• Electronic transport properties and quantum localization effects monitored by selective functionalization in Bernal bilayer graphene
• Electronic structure and transport in materials with flat bands: 2D materials and quasicrystals
• Spin relaxation, Josephson effect and Yu-Shiba-Rusinov states in superconducting bilayer graphene
• Fundamental properties of transition-metals-adsorbed graphene