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Effect of band structure on quantum interference in multiwall carbon nanotubes
Bernhard Stojetz1, Csilla Miko, Laszlo Forró
1Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
Physical Review Letters
|May 21, 2005
Summary
Conductance measurements on multiwall carbon nanotubes reveal unusual magnetoconductance quenching. This phenomenon, observed in a perpendicular magnetic field, is linked to the onset of quasi-one-dimensional subbands in the nanotube electronic structure.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Multiwall carbon nanotubes exhibit unique electronic properties due to their quasi-one-dimensional structure.
- Understanding their behavior under external stimuli like magnetic fields is crucial for electronic applications.
Purpose of the Study:
- To investigate the electronic band structure signatures in multiwall carbon nanotubes under diffusive quantum transport.
- To explore the effects of a perpendicular magnetic field on nanotube conductance.
Main Methods:
- Conductance measurements were performed on multiwall carbon nanotubes.
- A gate electrode was used to tune the nanotube Fermi level.
- A perpendicular magnetic field was applied.
Main Results:
- An unusual quenching of magnetoconductance was observed at specific gate voltages.
- The zero-bias anomaly in differential conductance also showed quenching under certain conditions.
- These observations correlate with the emergence of quasi-one-dimensional subbands.
Conclusions:
- The study links observed magnetoconductance quenching to the unique electronic band structure of carbon nanotubes.
- The findings provide insights into quantum transport phenomena in nanotubes.