Edge states in graphene-like systems

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Jose Lado

  • N. García-Martínez
  • J. Fernández-Rossier

Research units

  • International Iberian Nanotechnology Laboratory
  • University of Alicante

Abstract

The edges of graphene and graphene like systems can host localized states with evanescent wave function with properties radically different from those of the Dirac electrons in bulk. This happens in a variety of situations, that are reviewed here. First, zigzag edges host a set of localized non-dispersive state at the Dirac energy. At half filling, it is expected that these states are prone to ferromagnetic instability, causing a very interesting type of edge ferromagnetism. Second, graphene under the influence of external perturbations can host a variety of topological insulating phases, including the conventional quantum Hall effect, the quantum anomalous Hall (QAH) and the quantum spin Hall phase, in all of which phases conduction can only take place through topologically protected edge states. Here we provide an unified vision of the properties of all these edge states, examined under the light of the same one orbital tight-binding model. We consider the combined action of interactions, spin-orbit coupling and magnetic field, which produces a wealth of different physical phenomena. We briefly address what has been actually observed experimentally.

Details

Original languageEnglish
Pages (from-to)56-67
Number of pages12
JournalSynthetic Metals
Volume210
Publication statusPublished - 1 Dec 2015
MoE publication typeA1 Journal article-refereed

    Research areas

  • Edge states, Graphene, Magnetism, Topological insulator

ID: 36720223