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

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 (SWCNTs). 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.

References in corpus (7)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Transition from a Tomonaga-Luttinger liquid to a Fermi liquid in potassium intercalated bundles of single wall carbon nanotubes
• Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data
• NMR Evidence for Gapped Spin Excitations in Metallic Carbon Nanotubes
• Magnetic fullerenes inside single-wall carbon nanotubes
• Electron spin resonance signal of Luttinger liquids and single-wall carbon nanotubes

Cited by in corpus (3)

• Ultralong spin lifetime in light alkali atom doped graphene
• Observation of conduction electron spin resonance in boron doped diamond
• Doped carbon nanotubes as a model system of biased graphene