Electron Scattering in Intrananotube Quantum Dots

TL;DR

This paper investigates electron scattering phenomena within intrananotube quantum dots in metallic single-walled carbon nanotubes, revealing detailed scattering mechanisms and effects of Dirac cone degeneracy lifting through advanced spectroscopy and modeling.

Contribution

It provides new experimental insights into intra- and inter-valley electron scattering in nanotube quantum dots, supported by Fourier transform spectroscopy and a Fabry-Perot resonator model.

Findings

Clear signatures of inter- and intra-valley scattering observed

Level spacings up to 200 meV in quantum dots

Degeneracy lifting effects within the first Brillouin zone identified

Abstract

Intratube quantum dots showing particle-in-a-box-like states with level spacings up to 200meV are realized in metallic single-walled carbon nanotubes by means of low dose medium energy Ar irradiation. Fourier transform scanning tunneling spectroscopy compared to results of a Fabry-Perot electron resonator model yields clear signatures for inter- and intra-valley scattering of electrons confined between consecutive irradiation-induced defects (inter-defects distance < 10nm). Effects arising from lifting the degeneracy of the Dirac cones within the first Brillouin zone are also observed.