Ferromagnetic semiconductor single wall carbon nanotube

Details Ferromagnetic semiconductor single wall carbon nanotube Ferromagnetic semiconductor single wall carbon nanotube

2005-07-21

arxiv.org/abs/cond-mat/0507503v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages and 9 figures

Scientific paper

10.1088/0957-4484/17/8/005

Possibility of a ferromagnetic semiconductor single wall carbon nanotube (SWCNT), where ferromagnetism is due to coupling between doped magnetic impurity on a zigzag SWCNT and electrons spin, is investigate. We found, in the weak impurity-spin couplings, at low impurity concentrations the spin up electrons density of states remain semiconductor while the spin down electrons density of states shows a metallic behavior. By increasing impurity concentrations the semiconducting gap of spin up electrons in the density of states is closed, hence a semiconductor to metallic phase transition is take place. In contrast, for the case of strong coupling, spin up electrons density of states remain semiconductor and spin down electron has metallic behavior. Also by increasing impurity spin magnitude, the semiconducting gap of spin up electrons is increased.

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