Landau levels in 2D materials using Wannier Hamiltonians obtained by first principles

J. L. Lado, J. Fernández-Rossier

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Wepresent a method to calculate the Landau levels and the corresponding edge states of two dimensional (2D) crystals using as a starting point their electronic structure as obtained from standard density functional theory (DFT). The DFT Hamiltonian is represented in the basis of maximally localized Wannier functions. This defines a tight-binding Hamiltonian for the bulk that can be used to describe other structures, such as ribbons, provided that atomic scale details of the edges are ignored. The effect of the orbital magnetic field is described using the Peierls substitution in the hopping matrix elements. Implementing this approach in a ribbon geometry, we obtain both the Landau levels and the dispersive edge states for a series of 2D crystals, including graphene, Boron Nitride, MoS2, Black Phosphorous, Indium Selenide and MoO3. Our procedure can readily be used in any other 2D crystal, and provides an alternative to effective mass descriptions.

Original languageEnglish
Article number035023
Journal2D Materials
Volume3
Issue number3
DOIs
Publication statusPublished - 13 Sep 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Density functional theory
  • Dirac-ness
  • Landau levels
  • Quantum Hall
  • Wannier functions

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