Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field

Abstract

We report magnetic field spectroscopy measurements in carbon nanotube quantum dots exhibiting four-fold shell structure in the energy level spectrum. The magnetic field induces a large splitting between the two orbital states of each shell, demonstrating their opposite magnetic moment and determining transitions in the spin and orbital configuration of the quantum dot ground state. We use inelastic cotunneling spectroscopy to accurately resolve the spin and orbital contributions to the magnetic moment. A small coupling is found between orbitals with opposite magnetic moment leading to anticrossing behavior at zero field.

arXiv comment7 pages, 4 figures

References in corpus (7)

• Kondo effect in an integer-spin quantum dot
• Orbital Kondo effect in carbon nanotubes
• Electron Cotunneling in a Semiconductor Quantum Dot
• Electron-hole symmetry in a semiconducting carbon nanotube quantum dot
• Measuring electron orbital magnetic moments in carbon nanotubes
• Multi-wall carbon nanotubes as quantum dots
• Measurements of Kondo and spin splitting in single-electron transistors

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