Quantum and classical confinement of resonant states in a trilayer graphene Fabry-Perot interferometer

Abstract

The advent of few-layer graphenes has given rise to a new family of two-dimensional systems with emergent electronic properties governed by relativistic quantum mechanics. The multiple carbon sublattices endow the electronic wavefunctions with pseudospin, a lattice analog of the relativistic electron spin, while the multilayer structure leads to electric field effect tunable electronic bands. Here we use these properties to realize giant conductance oscillations in ballistic trilayer graphene Fabry-Perot interferometers, which result from phase coherent transport through resonant bound states beneath an electrostatic barrier. We cloak these states by selectively decoupling them from the leads, resulting in transport via non-resonant states and suppression of the giant oscillations. Cloaking is achieved both classically, by manipulating quasiparticle momenta with a magnetic field, and quantum mechanically, by locally varying the pseudospin character of the carrier wavefunctions. Our results illustrate the unique potential of trilayer graphene as a versatile platform for electron optics and pseudospintronics.

Nature Communications, accepted (this is original submitted version; published version contains only minor edits)

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• Electron optics with dirac fermions: electron transport in monolayer and bilayer graphene through magnetic barrier and their superlattices
• Giant valley-isospin conductance oscillations in ballistic graphene
• Evidence of electronic cloaking from chiral electron transport in bilayer graphene nanostructures
• Characterization of Hydrogen Plasma Defined Graphene Edges
• Reversible doping of graphene field effect transistors by molecular hydrogen: the role of the metal/graphene interface
• Anisotropic Fabry-Pérot resonant states confined within nano-steps on the topological insulator surface
• Transport spectroscopy for Paschen-Back splitting of Landau levels in InAs nanowires