Strain engineering converts semiconducting 7aGNRsH to conductive across IR-visible-UV while metallic 7aGNRsH-B and 7aGNRsH-V retain non-zero conductivity; Berry curvature localizes differently under strain.
Zak, Berry phase for energy bands in solids, Physical review letters 62, 2747 (1989)
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First-principles calculations of electrical conductivities of edge-modified graphene nanoribbons: strain effect
Strain engineering converts semiconducting 7aGNRsH to conductive across IR-visible-UV while metallic 7aGNRsH-B and 7aGNRsH-V retain non-zero conductivity; Berry curvature localizes differently under strain.