We study effects of changing inter wall hopping on the electronic and structural properties of (n, n)@)(2n, 2n) and (n, 0)@(2n, 0) double-wall carbon nanotubes using tight-binding model. We found by switching inter-wall interactions a valley opened in the (n, n)@(2n, 2n) local density of states, although both walls remained metallic. For the case of (n, 0)@(2n, 0) where n is not multiple of 3 a semiconducting to metallic phase transition is found, while when n is multiple of 3 both inner and outer walls remained metallic.
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