Density of states deduced from ESR measurements on low-dimensional nanostructures; benchmarks to identify the ESR signals of graphene and swcnts

Péter Szirmai, Gábor Fábián, Balázs Dóra, János Koltai, Viktor Zólyomi, Jenö Kürti, Norbert M. Nemes, László Forró, Ferenc Simon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Electron spin resonance (ESR) spectroscopy is an important tool to characterize the ground state of conduction electrons and to measure their spin-relaxation times. Observing ESR of the itinerant electrons is thus of great importance in graphene and in single-wall carbon nanotubes. Often, the identification of CESR signal is based on two facts: the apparent asymmetry of the ESR signal (known as a Dysonian lineshape) and on the temperature independence of the ESR signal intensity. We argue that these are insufficient as benchmarks and instead the ESR signal intensity (when calibrated against an intensity reference) yields an accurate characterization. We detail the method to obtain the density of states from an ESR signal, which can be compared with theoretical estimates. We demonstrate the success of the method for K doped graphite powder. We give a benchmark for the observation of ESR in graphene.

Original languageEnglish
Pages (from-to)2688-2691
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume248
Issue number11
DOIs
Publication statusPublished - Nov 2011

Keywords

  • Carbon nanotubes
  • Electron spin resonance
  • Graphene
  • Pauli susceptibility
  • Spin life-time
  • Spin-decoherence
  • Spintronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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