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Aharonov-Bohm conductance modulation in ballistic carbon nanotubes
B Lassagne1, J-P Cleuziou, S Nanot
1Laboratoire National des Champs Magnétiques Pulsés, UMR5147, Toulouse, France.
Physical Review Letters
|May 16, 2007
Summary
Giant conductance modulations were observed in ballistic multiwalled carbon nanotubes using strong magnetic fields. This study provides the first clear experimental evidence of the Aharonov-Bohm effect in clean carbon nanotubes.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Ballistic transport in carbon nanotubes is crucial for nanoelectronic devices.
- Understanding quantum phenomena like the Aharonov-Bohm effect in nanotubes is essential for advancing quantum technologies.
Purpose of the Study:
- To investigate magnetoconductance in ballistic multiwalled carbon nanotubes under high magnetic fields.
- To provide unambiguous experimental evidence of the Aharonov-Bohm effect in clean multiwalled carbon nanotubes.
Main Methods:
- Magnetoconductance experiments were performed on ballistic multiwalled carbon nanotubes.
- High magnetic fields up to 55 Tesla were applied.
- Data analysis focused on the field-dependent density of states and electrode-nanotube interface properties.
Main Results:
- Giant modulations of conductance were observed at high temperatures (100 K).
- These modulations are linked to the Fermi level location and the external shell's density of states.
- The findings demonstrate the influence of magnetic fields on electron transport properties.
Conclusions:
- The study presents the first unambiguous experimental evidence of the Aharonov-Bohm effect in clean multiwalled carbon nanotubes.
- The results highlight the role of the external shell's electronic structure in modulating transport.
- This work advances the understanding of quantum effects in nanostructured materials.
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