Manipulating electron waves in graphene using carbon nanotube gating

Shiang-Bin Chiu (邱翔彬), Alina Mreńca-Kolasińska (柯琳娜), Ka Long Lei (李嘉朗), Ching-Hung Chiu (邱靖鈜), Wun-Hao Kang (康文豪), Szu-Chao Chen (陳思超), and Ming-Hao Liu (劉明豪)
Phys. Rev. B 105, 195416 – Published 16 May 2022

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.

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  • Received 2 March 2022
  • Revised 29 April 2022
  • Accepted 2 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.195416

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shiang-Bin Chiu (邱翔彬)1,2, Alina Mreńca-Kolasińska (柯琳娜)1,3,*, Ka Long Lei (李嘉朗)1, Ching-Hung Chiu (邱靖鈜)1, Wun-Hao Kang (康文豪)1, Szu-Chao Chen (陳思超)1, and Ming-Hao Liu (劉明豪)1,†

  • 1Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
  • 2Department of Physics, National Taiwan University, Taipei 10617, Taiwan
  • 3AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Kraków, Poland

  • *alina.mrenca@fis.agh.edu.pl
  • minghao.liu@phys.ncku.edu.tw

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Issue

Vol. 105, Iss. 19 — 15 May 2022

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