Journal
PHYSICAL REVIEW B
Volume 79, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.125402
Keywords
ab initio calculations; carbon nanotubes; electronic density of states; moire fringes; scanning tunnelling microscopy
Funding
- MEXT
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Long-range quasiperiodic patterns are found in scanning tunneling microscopy (STM) images of double-walled carbon nanotubes (DWNTs) on top of the atomic images of six-membered carbon rings of the outer tubes. By comparing the results of first-principles calculations on model DWNTs, we conclude that they are moire patterns showing local modulations of electronic states due to the interlayer interactions between the outer and inner tubes. We also demonstrate that these moire patterns can be used to assign the chiral vector of the inner tube of a DWNT which is usually inaccessible by STM.
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