Submitted on November 16, 2001
Accepted on December 14, 2001
Mapping the One-Dimensional Electronic States of Nanotube Peapod Structures
D. J. Hornbaker 1,
S.-J. Kahng 2,
S. Misra 1,
B. W. Smith 3,
A. T. Johnson 4,
E. J. Mele 4,
D. E. Luzzi 5,
A. Yazdani 1*
1 Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
2 Department of Physics, Soongsil University, Seoul, Korea; Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
3 Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
4 Department of Physics and Astronomy, Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104, USA.
5 Department of Materials Science and Engineering, Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104, USA.
* To whom correspondence should be addressed. E-mail: ayazdani{at}uiuc.edu.
Arrays of C60 molecules nested inside single-walled nanotubes represent a class of nanoscale materials having tunable properties. We report electronic measurements of this system using a scanning tunneling microscope and demonstrate that the encapsulated C60 molecules modify the local electronic structure of the nanotube. Our measurements and calculations also show that a periodic array of C60 molecules gives rise to a hybrid electronic band, which derives its character from both the nanotube states and the C60 molecular orbitals.
