Creating and Steering Highly Directional Electron Beams in Graphene

Abstract

We put forward a concept to create highly collimated, non-dispersive electron beams in pseudo-relativistic Dirac materials such as graphene or topological insulator surfaces. Combining negative refraction and Klein collimation at a parabolic pn junction, the proposed lens generates beams, as narrow as the focal length, that stay focused over scales of several microns and can be steered by a magnetic field without losing collimation. We demonstrate the lens capabilities by applying it to two paradigmatic settings of graphene electron optics: We propose a setup for observing high-resolution angle-dependent Klein tunneling, and, exploiting the intimate quantum-to-classical correspondence of these focused electron waves, we consider high-fidelity transverse magnetic focusing accompanied by simulations for current mapping through scanning gate microscopy. Our proposal opens up new perspectives for next-generation graphene electron optics experiments.

published version, with supplemental material

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Cited by in corpus (9)

• Spintronic signatures of Klein tunneling in topological insulators
• Electron beam splitting at topological insulator surface states and a proposal for electronic Goos-Hanchen shift measurement
• A corner reflector of graphene Dirac fermions as a phonon-scattering sensor
• Graphene whisperitronics: transducing whispering gallery modes into electronic transport
• Chaos based Berry phase detector
• Manipulating electron waves in graphene using carbon nanotube gating
• Type-II Dirac cone and Dirac cone protected by nonsymmorphic symmetry in carbon-lithium compound (C4Li)
• Spin inversion in fluorinated graphene n-p junction
• Electronic confinement of surface states in a topological insulator nanowire