Absorptive pinhole collimators for ballistic Dirac fermions in graphene

Arthur W. Barnard (), Alex Hughes, Aaron L. Sharpe, Kenji Watanabe, Takashi Taniguchi and David Goldhaber-Gordon ()
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Arthur W. Barnard: Stanford University
Alex Hughes: Stanford University
Aaron L. Sharpe: Stanford University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
David Goldhaber-Gordon: Stanford University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Ballistic electrons in solids can have mean free paths far larger than the smallest features patterned by lithography. This has allowed development and study of solid-state electron-optical devices such as beam splitters and quantum point contacts, which have informed our understanding of electron flow and interactions. Recently, high-mobility graphene has emerged as an ideal two-dimensional semimetal that hosts unique chiral electron-optical effects due to its honeycomb crystalline lattice. However, this chiral transport prevents the simple use of electrostatic gates to define electron-optical devices in graphene. Here we present a method of creating highly collimated electron beams in graphene based on collinear pairs of slits, with absorptive sidewalls between the slits. By this method, we achieve beams with angular width 18° or narrower, and transmission matching classical ballistic predictions.

Date: 2017
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DOI: 10.1038/ncomms15418

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