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Helium in one-dimensional nanopores: free dispersion, localization, and commensurate/incommensurate transitions with
M Boninsegni1, S Y Lee, V H Crespi
1Department of Physics, San Diego State University, San Diego, CA 92182, USA.
Physical Review Letters
|May 1, 2001
Abstract:
The single-particle states of helium within a bundle of carbon nanotubes can range from nearly free-particle dispersion to localization, even within a single bundle. At intermediate effective masses, the corrugation in the external potential can be comparable to the intrasite He-He hard-core interaction. This results in a commensurate/incommensurate transition, where the mobility of the doubly occupied domain-wall solitons at high density greatly exceeds the corresponding hole mobility below the transition.