Abstract
Magnetotransport measurements in large diameter multiwall carbon nanotubes (20–40 nm) demonstrate the competition of a magnetic-field dependent bandstructure and Altshuler–Aronov–Spivak oscillations. By means of an efficient capacitive coupling to a backgate electrode, the magnetoconductance oscillations are explored as a function of Fermi level shift. Changing the magnetic field orientation with respect to the tube axis and by ensemble averaging, allows the contributions of different Aharonov–Bohm phases to be identified. The results are in qualitative agreement with numerical calculations of the band structure and the conductance.
Highlights
The growing interest on molecular scale electronic transport has motivated much research on carbon nanotubes[1]
The results are in qualitative agreement with numerical calculations of the band structure and the conductance
Single-wall carbon nanotubes with small diameters can be almost free from contaminations or defects, making them ballistic 1D conductors
Summary
The growing interest on molecular scale electronic transport has motivated much research on carbon nanotubes[1]. Competition between magnetic field dependent band structure and coherent backscattering in multiwall carbon nanotubes Magnetotransport measurements in large diameter multiwall carbon nanotubes (20-40 nm) demonstrate the competition of a magnetic-field dependent bandstructure and Altshuler-AronovSpivak oscillations.
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