Strongly coupled modes in bi-waveguides based on graphene

Cesar E.P. Villegas, Marcos R.S. Tavares

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We theoretically study the confined (guided) subbands (modes) in strongly coupled double waveguides based on graphene. We find the spectra of the two-dimensional (2D) Dirac-like Hamiltonian with a quasi-mass parameter β, which is incorporated into the Hamiltonian in an ad hoc manner. Such a term can represent phenomenologically the spinorbit interaction strength in the graphene sample. We found strongly coupled modes as the wavevector ky increased. We show that different choices for the parameter β in both waveguides induce asymmetry effects on the guided modes, reflecting anomalous effects on their probability density functions. We also find the same spectra for a single waveguide of width 50 nm. We plot the guided modes up to the seventh order in the E-θ phase space. By showing them, we completely map out the values of the reflection angle θ for which the guidance takes place with the most probability.

Original languageEnglish
Pages (from-to)1350-1354
Number of pages5
JournalSolid State Communications
Volume150
Issue number29-30
DOIs
StatePublished - Aug 2010

Bibliographical note

Funding Information:
The authors would like to thank FAPESP and Universidade Federal do ABC, Brazil , for financial support.

Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.

Keywords

  • Confined states
  • Graphene
  • Waveguides

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