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. 2015 Mar 30;6:6636. doi: 10.1038/ncomms7636

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The chain is connected to two different types of contacts: sp² (graphene nanoribbon) and sp³ (carbon nanotube). The projection on real space of the shaded red and blue regions of the DOS is illustrated on the nanoribbon–chain–nanotube system, respectively. The charge neutrality point (Fermi energy) of the system is the reference zero energy.