Localization and quantization in covalently bonded carbon nanotube junctions
Abstract
A tight-binding Hamiltonian is used to study the electronic properties of covalently bonded, crossed (5,5) metallic nanotubes with an increasing degree of disorder in the junction region. Ideal junctions with a few topological defects show Ohmic behavior. Upon increasing disorder, Ohmic conduction is suppressed in favor of hopping conductivity. Strongly disordered junctions as could be obtained after electron-beam irradiation of overlayed nanotubes, display weak localization and energy quantization, indicating the formation of a quantum dot contacted to metallic nanowires by tunnel barriers.
- Publication:
-
Physical Review B
- Pub Date:
- March 2004
- DOI:
- 10.1103/PhysRevB.69.121412
- Bibcode:
- 2004PhRvB..69l1412C
- Keywords:
-
- 61.46.+w;
- 71.23.An;
- 73.21.La;
- Theories and models;
- localized states;
- Quantum dots