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

Research output: Contribution to journalJournal article

Published

  • Peter Szirmai
  • Gabor Fabian
  • Balazs Dora
  • Janos Koltai
  • Viktor Zolyomi
  • Jeno Kurti
  • Norbert M. Nemes
  • Laszlo Forro
  • Ferenc Simon
Journal publication date1/11/2011
JournalPhysica Status Solidi (B)
Journal number11
Volume248
Number of pages4
Pages2688-2691
Original languageEnglish

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.