Doped carbon nanotubes as a model system of biased graphene

Abstract

Albeit difficult to access experimentally, the density of states (DOS) is a key parameter in solid state systems which governs several important phenomena including transport, magnetism, thermal, and thermoelectric properties. We study DOS in an ensemble of potassium intercalated single-wall carbon nanotubes (SWCNT) and show using electron spin resonance spectroscopy that a sizeable number of electron states are present, which gives rise to a Fermi-liquid behavior in this material. A comparison between theoretical and the experimental DOS indicates that it does not display significant correlation effects, even though the pristine nanotube material shows a Luttinger-liquid behavior. We argue that the carbon nanotube ensemble essentially maps out the whole Brillouin zone of graphene thus it acts as a model system of biased graphene.

References in corpus (10)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Half-Metallic Graphene Nanoribbons
• Measurement of the Optical Conductivity of Graphene
• Magnetic fullerenes inside single-wall carbon nanotubes
• Electron spin resonance signal of Luttinger liquids and single-wall carbon nanotubes
• Universal temperature dependence of optical excitation life-time and band-gap in chirality assigned semiconducting single-wall carbon nanotubes
• Observation of conduction electron spin resonance in boron doped diamond
• Testing the Elliott-Yafet spin-relaxation mechanism in KC8; a model system of biased graphene
• Electron spin dynamics in strongly correlated metals

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• Charge Transport Mechanism in Chevron--Graphene Nanoribbons
• Electronic properties of air-sensitive nanomaterials probed with microwave impedance measurements
• Tuning Conductivity and Spin Dynamics in Few-Layer Graphene via In Situ Potassium Exposure