Drastic change of phase interference by small diffusion of heavy-mass electrode atoms in carbon nanotubes and phase switching device

Haruyama, Junji; Takesue, Izumi; Hasegawa, Tetsuro
July 2001
Applied Physics Letters;7/9/2001, Vol. 79 Issue 2
Academic Journal
We slightly diffuse atoms of electrode materials into one end of multiwalled carbon nanotubes (MWNTs), grown using nanoporous alumina membranes. Diffusion of the light-mass materials (carbon and aluminum) lead to weak localization in Altshuler–Aronov–Spivak oscillation, consistent with past reports. In contrast, we find that diffusion of heavy-mass materials (gold and platinum) at the volume ratio of only about 5% change this weak localization to antilocalization. It is understood by a drastic change of the phase interference caused by the injection of spin-flipped electrons due to spin–orbit interaction in the diffusion region, in the entire part of the MWNTs. We also propose an electron-wave phase switching circuit using this effect. © 2001 American Institute of Physics.


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