h/e Magnetic Flux Modulation of the Energy Gap in Nanotube Quantum Dots

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Science  21 May 2004:
Vol. 304, Issue 5674, pp. 1132-1134
DOI: 10.1126/science.1096647

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We report experiments on quantum dot single-electron-tunneling (SET) transistors made from short multiwall nanotubes and threaded by magnetic flux. Such systems allow us to probe the electronic energy spectrum of the nanotube and its dependence on the magnetic field. Evidence is provided for the interconversion between gapped (semiconducting) and ungapped (metallic) states. Our tubes exhibit h/e-period magnetic flux dependence, in agreement with simple tight-binding calculations.

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