Impurity cyclotron resonance of anomalous Dirac electrons in graphene

S. C. Kim, Sung Ryul Yang, A. H. Macdonald

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have investigated a new feature of impurity cyclotron resonances common to various localized potentials of graphene. A localized potential can interact with a magnetic field in an unexpected way in graphene. It can lead to formation of anomalous boundstates that have a sharp peak with a width R in the probability density inside the potential and a broad peak of size magnetic length ℓ outside the potential. We investigate optical matrix elements of anomalous states and find that they are unusually small and depend sensitively on the magnetic field. The effect of many-body interactions on their optical conductivity is investigated using a self-consistent time-dependent Hartree-Fock approach. For a completely filled Landau level we find that an excited electron-hole pair, originating from the optical transition between two anomalous impurity states, is nearly uncorrelated with other electron-hole pairs, although it displays substantial exchange self-energy effects. This absence of correlation is a consequence of a small vertex correction in comparison to the difference between renormalized transition energies computed within the one electron-hole pair approximation. However, an excited electron-hole pair originating from the optical transition between a normal and an anomalous impurity state can be substantially correlated with other electron-hole states with a significant optical strength.

Original languageEnglish
Article number325302
JournalJournal of Physics Condensed Matter
Volume26
Issue number32
DOIs
Publication statusPublished - 2014 Aug 13

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Cyclotrons
Cyclotron resonance
Graphite
cyclotron resonance
Graphene
graphene
Electrons
Impurities
impurities
Optical transitions
Magnetic Fields
electrons
optical transition
Magnetic fields
Optical conductivity
Electron transitions
magnetic fields
apexes
conductivity
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Impurity cyclotron resonance of anomalous Dirac electrons in graphene. / Kim, S. C.; Yang, Sung Ryul; Macdonald, A. H.

In: Journal of Physics Condensed Matter, Vol. 26, No. 32, 325302, 13.08.2014.

Research output: Contribution to journalArticle

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