Absorptive pinhole collimators for ballistic Dirac fermions in graphene.

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,

SUBMITTER: Barnard AW 

PROVIDER: S-EPMC5440660 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature