Novel 0D Devices: Carbon-Nanotube Quantum Dots
We have designed a carbon-based quantum dot and a quantum barrier by introducing pentagon-heptagon defects in a carbon nanotube, in a way that is equivalent to combine two carbon-nanotube metal-semiconductor junctions.The quantum dot system has completely confined electronic states, so it behaves as an ideal 0-dimensional (0D)device, presenting well-separated discrete levels. By varying the distance between pentagon-heptagon pairs, the number and characteristics of the discrete levels can be modified.The inclusion of topological defects in a nanotube can also produce a quantum barrier. The study of the properties of such structure throws light onto the complex nature of topological barriers.
KeywordsTopological Defect Discrete Level Pair Defect Metallic Tube Quantum Barrier
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