A two-dimensional Dirac fermion microscope

Peter Bøggild (), José M. Caridad, Christoph Stampfer, Gaetano Calogero, Nick Rübner Papior and Mads Brandbyge
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Peter Bøggild: CNG, DTU Nanotech, Technical University of Denmark
José M. Caridad: CNG, DTU Nanotech, Technical University of Denmark
Christoph Stampfer: JARA-FIT and 2nd Institute of Physics, RWTH Aachen University
Gaetano Calogero: CNG, DTU Nanotech, Technical University of Denmark
Nick Rübner Papior: CNG, DTU Nanotech, Technical University of Denmark
Mads Brandbyge: CNG, DTU Nanotech, Technical University of Denmark

Nature Communications, 2017, vol. 8, issue 1, 1-12

Abstract: Abstract The electron microscope has been a powerful, highly versatile workhorse in the fields of material and surface science, micro and nanotechnology, biology and geology, for nearly 80 years. The advent of two-dimensional materials opens new possibilities for realizing an analogy to electron microscopy in the solid state. Here we provide a perspective view on how a two-dimensional (2D) Dirac fermion-based microscope can be realistically implemented and operated, using graphene as a vacuum chamber for ballistic electrons. We use semiclassical simulations to propose concrete architectures and design rules of 2D electron guns, deflectors, tunable lenses and various detectors. The simulations show how simple objects can be imaged with well-controlled and collimated in-plane beams consisting of relativistic charge carriers. Finally, we discuss the potential of such microscopes for investigating edges, terminations and defects, as well as interfaces, including external nanoscale structures such as adsorbed molecules, nanoparticles or quantum dots.

Date: 2017
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DOI: 10.1038/ncomms15783

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