The advent of few-layer graphenes has given rise to a new family oftwo-dimensional systems with emergent electronic properties governed byrelativistic quantum mechanics. The multiple carbon sublattices endow theelectronic wavefunctions with pseudospin, a lattice analog of the relativisticelectron spin, while the multilayer structure leads to electric field effecttunable electronic bands. Here we use these properties to realize giantconductance oscillations in ballistic trilayer graphene Fabry-Perotinterferometers, which result from phase coherent transport through resonantbound states beneath an electrostatic barrier. We cloak these states byselectively decoupling them from the leads, resulting in transport vianon-resonant states and suppression of the giant oscillations. Cloaking isachieved both classically, by manipulating quasiparticle momenta with amagnetic field, and quantum mechanically, by locally varying the pseudospincharacter of the carrier wavefunctions. Our results illustrate the uniquepotential of trilayer graphene as a versatile platform for electron optics andpseudospintronics.
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