Gate-dependent orbital magnetic moments in carbon nanotubes

Thomas Sand Jespersen; Kasper Grove-Rasmussen; Karsten Flensberg; Jens Paaske; K. Muraki; T. Fujisawa; Jesper Nygård

doi:10.1103/PhysRevLett.107.186802

Gate-dependent orbital magnetic moments in carbon nanotubes

Thomas Sand Jespersen, Kasper Grove-Rasmussen, Karsten Flensberg, Jens Paaske, K. Muraki, T. Fujisawa, Jesper Nygård

18 Citations (Scopus)

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Abstract

We investigate how the orbital magnetic moments of electron and hole states in a carbon nanotube quantum dot depend on the number of carriers on the dot. Low temperature transport measurements are carried out in a setup where the device can be rotated in an applied magnetic field, thus enabling accurate alignment with the nanotube axis. The field dependence of the level structure is measured by excited state spectroscopy and excellent correspondence with a single-particle calculation is found. In agreement with band structure calculations we find a decrease of the orbital magnetic moment with increasing electron or hole occupation of the dot, with a scale given by the band gap of the nanotube.

Original language	English
Journal	Physical Review Letters
Volume	107
Issue number	18
Pages (from-to)	186802
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.107.186802
Publication status	Published - 25 Oct 2011

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abstract = "We investigate how the orbital magnetic moments of electron and hole states in a carbon nanotube quantum dot depend on the number of carriers on the dot. Low temperature transport measurements are carried out in a setup where the device can be rotated in an applied magnetic field, thus enabling accurate alignment with the nanotube axis. The field dependence of the level structure is measured by excited state spectroscopy and excellent correspondence with a single-particle calculation is found. In agreement with band structure calculations we find a decrease of the orbital magnetic moment with increasing electron or hole occupation of the dot, with a scale given by the band gap of the nanotube.",

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AU - Jespersen, Thomas Sand

AU - Grove-Rasmussen, Kasper

AU - Flensberg, Karsten

AU - Paaske, Jens

AU - Muraki, K.

AU - Fujisawa, T.

AU - Nygård, Jesper

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N2 - We investigate how the orbital magnetic moments of electron and hole states in a carbon nanotube quantum dot depend on the number of carriers on the dot. Low temperature transport measurements are carried out in a setup where the device can be rotated in an applied magnetic field, thus enabling accurate alignment with the nanotube axis. The field dependence of the level structure is measured by excited state spectroscopy and excellent correspondence with a single-particle calculation is found. In agreement with band structure calculations we find a decrease of the orbital magnetic moment with increasing electron or hole occupation of the dot, with a scale given by the band gap of the nanotube.

AB - We investigate how the orbital magnetic moments of electron and hole states in a carbon nanotube quantum dot depend on the number of carriers on the dot. Low temperature transport measurements are carried out in a setup where the device can be rotated in an applied magnetic field, thus enabling accurate alignment with the nanotube axis. The field dependence of the level structure is measured by excited state spectroscopy and excellent correspondence with a single-particle calculation is found. In agreement with band structure calculations we find a decrease of the orbital magnetic moment with increasing electron or hole occupation of the dot, with a scale given by the band gap of the nanotube.

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Gate-dependent orbital magnetic moments in carbon nanotubes

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