Theory and model analysis of spin relaxation time in graphene - Could it be used for spintronics?

F. Simon, Ferenc Murányi, B. Dóra

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Graphene appears to be an excellent candidate for spintronics due to the low spin-orbit coupling in carbon, the twodimensional nature of the graphene sheet, and the high electron mobility. However, recent experiments by Tombros et al. [Nature 448, 571 (2007).] found a prohibitively short spindecoherence time in graphene. We present a comprehensive theory of spin decoherence in graphene including intrinsic, Bychkov-Rashba, and ripple related spin-orbit coupling. We find that the available experimental data can be explained by an intrinsic spin-orbit coupling which is orders of magnitude larger than predicted in first principles calculations. We show that comparably large values are present for structurally and electronically similar systems, MgB 2 and Li intercalated graphite. The spin-relaxation in graphene is neither due to the Elliott-Yafet nor due to the Dyakonov-Perel mechanism but a smooth crossover between the two regimes occurs near the Dirac point as a function of the chemical potential.

Original languageEnglish
Pages (from-to)2631-2634
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume248
Issue number11
DOIs
Publication statusPublished - Nov 2011

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Magnetoelectronics
Graphite
Relaxation time
Graphene
graphene
relaxation time
Orbits
orbits
Electron mobility
Chemical potential
ripples
electron mobility
crossovers
graphite
Carbon
carbon
Experiments

Keywords

  • Carbon nanotubes
  • Electron spin resonance
  • Graphene
  • Spin-decoherence
  • Spin-lifetime
  • Spintronics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Theory and model analysis of spin relaxation time in graphene - Could it be used for spintronics? / Simon, F.; Murányi, Ferenc; Dóra, B.

In: Physica Status Solidi (B) Basic Research, Vol. 248, No. 11, 11.2011, p. 2631-2634.

Research output: Contribution to journalArticle

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