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Propagation of Cooper pairs in carbon nanotubes with superconducting correlations
Kikuo Harigaya
Propagation of Cooper pairs in carbon nanotubes in the presence of superconducting correlations is studied theoretically. We find that negative and positive currents induced by imp…
Optical excitations in diphenylacetylene based dendrimers studied by a coupled exciton model with off-diagonal disorder
Kikuo Harigaya
A phenomenological coupled exciton model is proposed in order to characterize optical excitations in extended dendrimers. An onsite exciton state is assigned at each phenyl rings a…
Mechanism of magnetism in stacked nanographite with open shell electrons
Kikuo Harigaya, Toshiaki Enoki
Antiferromagnetism in stacked nanographite is investigated with using the Hubbard-type models. The A-B stacking or the stacking near to that of A-B type is favorable for the hexago…
Mechanism of Magnetism in Stacked Nanographite
Kikuo Harigaya, Naoki Kawatsu, Toshiaki Enoki
Nanographite systems, where graphene sheets of the orders of the nanometer size are stacked, show novel magnetic properties, such as, spin-glass like behaviors, and the change of E…