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Klein collimation by rippled graphene superlattice.

M Pudlak1, R G Nazmitdinov2,3

  • 1Institute of Experimental Physics, 04001 Kosice, Slovakia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 31, 2019
PubMed
Summary
This summary is machine-generated.

Surface curvature in graphene creates n-p junctions, enabling selective electron momentum control. This allows for waveguide-free electron focusing in graphene strips using tunable superlattices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • The electronic properties of graphene, particularly carbon orbital hybridization, are sensitive to surface curvature.
  • Curvature-induced charge accumulation and the Klein tunneling phenomenon can create unique electronic junctions in graphene.
  • Controlling electron transport in graphene typically requires external fields or complex structures like waveguides.

Purpose of the Study:

  • To investigate the role of surface curvature in modulating graphene's electronic properties.
  • To demonstrate a method for achieving selective electron momentum distribution and focusing in graphene.
  • To explore the potential of curvature-engineered superlattices for electron beam manipulation.

Main Methods:

  • Theoretical analysis of [Formula: see text] and [Formula: see text] orbital hybridization in curved graphene.
  • Modeling of charge accumulation at flat-rippled graphene junctions due to Klein tunneling.
  • Simulation of electron transport through a one-dimensional periodic potential created by a superlattice of varying curvature graphene segments.

Main Results:

  • A single junction between flat and rippled graphene exhibits charge accumulation and forms an n-p junction via Klein tunneling.
  • A superlattice of periodically varied graphene curvature creates a tunable one-dimensional periodic potential.
  • This superlattice enables selective electron momentum distribution and controlled electron focusing without external fields.

Conclusions:

  • Graphene's surface curvature is a powerful tool for engineering its electronic band structure and creating functional junctions.
  • Curvature-induced n-p junctions and superlattices offer a novel, field-free approach to manipulate electron beams in graphene.
  • The ability to tune electron focusing by altering superlattice element properties highlights the potential for advanced graphene-based electronic devices.