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What is the band structure of a zigzag carbon nanotube with a diameter of 1 nm and a length of 100 nm using the tight-binding approximation? How does the band gap of the nanotube change with its diameter and chirality? What are the implications of the band structure on the electrical and thermal properties of the nanotube?
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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