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2017 ; 8
(ä): 15783
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A two-dimensional Dirac fermion microscope
#MMPMID28598421
Bøggild P
; Caridad JM
; Stampfer C
; Calogero G
; Papior NR
; Brandbyge M
Nat Commun
2017[Jun]; 8
(ä): 15783
PMID28598421
show ga
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.