Understanding structures and electronic/spintronic properties of single molecules, nanowires, nanotubes, and nanoribbons towards the design of nanodevices

Theoretical understanding of metal nanowires and molecular devices is described towards the design of novel nanodevices. We focus our attention on structures, electronic, and spintronic properties of low dimensional metallic/molecular nanostructures based mostly on our recent works. The discussion includes (i) electric field induced molecular orbital control towards molecular electronic and spintronic devices, (ii) conductances of carbon nanotubes and graphene nanoribbons, (iii) low dimensional structures and properties, focusing on the stability, quantum conductance, and magnetic features of metallic nanowires, and (iv) metal vs. carbon nanotube/graphene electrodes for negative differential resistance in molecular electronics.