Journal
SCIENCE
Volume 290, Issue 5496, Pages 1552-1555Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.290.5496.1552
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Modulation doping of a semiconducting single-walled carbon nanotube along its length leads to an intramolecular wire electronic device. The nanotube is doped n-type for half of Its length and p-type for the other half. Electrostatic gating can tune the system into p-n junctions, causing it to exhibit rectifying characteristics or negative differential conductance. The system can also be tuned into n-type, exhibiting single-electron charging and negative differential conductance at low temperatures. The low-temperature behavior is manifested by a quantum dot formed by chemical inhomogeneity along the tube.
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