Manipulating electron waves in graphene using carbon nanotube gating

Shiang Bin Chiu, Alina Mreńca-Kolasińska, Ka Long Lei, Ching Hung Chiu, Wun Hao Kang, Sz-Chao Chen, Ming Hao Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Graphene with its dispersion relation resembling that of photons offers ample opportunities for applications in electron optics. The spacial variation of carrier density by external gates can be used to create electron waveguides, in analogy to optical fiber, with additional confinement of the carriers in bipolar junctions leading to the formation of few transverse guiding modes. We show that waveguides created by gating graphene with carbon nanotubes (CNTs) allow obtaining sharp conductance plateaus, and propose applications in the Aharonov-Bohm and two-path interferometers, and a pointlike source for injection of carriers in graphene. Other applications can be extended to Bernal-stacked or twisted bilayer graphene or two-dimensional electron gas. Thanks to their versatility, CNT-induced waveguides open various possibilities for electron manipulation in graphene-based devices.

Original languageEnglish
Article number195416
JournalPhysical Review B
Volume105
Issue number19
DOIs
Publication statusPublished - 2022 May 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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