Entanglement and magnetism in high-spin graphene nanodisks

I. Hagymási, O. Legeza

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate the ground-state properties of triangular graphene nanoflakes with zigzag edge configurations. The description of zero-dimensional nanostructures requires accurate many-body techniques since the widely used density-functional theory with local density approximation or Hartree-Fock methods cannot handle the strong quantum fluctuations. Applying the unbiased density-matrix renormalization group algorithm we calculate the magnetization and entanglement patterns with high accuracy for different interaction strengths and compare them to the mean-field results. With the help of quantum information analysis and subsystem density matrices we reveal that the edges are strongly entangled with each other. We also address the effect of electron and hole doping and demonstrate that the magnetic properties of triangular nanoflakes can be controlled by an electric field, which reveals features of flat-band ferromagnetism. This may open up new avenues in graphene based spintronics.

Original languageEnglish
Article number035142
JournalPhysical Review B
Volume97
Issue number3
DOIs
Publication statusPublished - Jan 17 2018

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Magnetism
Graphene
graphene
Information analysis
Local density approximation
Magnetoelectronics
Ferromagnetism
Ground state
information analysis
Density functional theory
Nanostructures
Magnetization
Magnetic properties
Electric fields
Doping (additives)
ferromagnetism
Electrons
density functional theory
magnetic properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Entanglement and magnetism in high-spin graphene nanodisks. / Hagymási, I.; Legeza, O.

In: Physical Review B, Vol. 97, No. 3, 035142, 17.01.2018.

Research output: Contribution to journalArticle

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