Modulation effects on Landau levels in a monolayer graphene

J. H. Ho, Y. H. Lai, Y. H. Chiu, M. F. Lin

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Magnetoelectronic properties of a single-layer graphene are studied by the Peierls tight-binding model. A new numerical technique is developed to obtain a band-like Hamiltonian matrix. A spatially modulated magnetic field B′ could drastically alter the Landau levels due to a uniform magnetic field B. The modulation effects include enhancement in dimensionality, change of energy dispersions, destruction of state degeneracy and creation of band-edge states. The dispersionless Landau levels, those at the Fermi levels excepted, become the 1D parabolic bands. The density of states thus exhibits many pairs of asymmetric prominent peaks. The height, frequency and number of pronounced peaks strongly depend on the modulation strength. These characteristics are hardly affected by the period and direction when B′ is much weaker than B. The predicted results could be verified by experimental measurements on magneto-optical absorption spectra.

Original languageEnglish
Article number035712
JournalNanotechnology
Volume19
Issue number3
DOIs
Publication statusPublished - 2008 Jan 23

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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