Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.7: Poster

Freitag, 4. März 2005, 14:00–18:00, Poster TU C

Zero-Bias Anomaly in Disordered Multiwall Carbon Nanotubes — •N. Kang, L. Lu, Z. W. Pan, and S. S. Xie — Institute of Physics, Chinese Academy of Science, Beijing, People’s Republic of China

Multiwall carbon nanotubes (MWNTs) provide a unique system for studying electron-electron (e-e) interaction effects in disordered wires. We have studied tunneling of electrons into MWNTs as a function of voltage and temperature. The conductance of MWNTs exhibits a strong suppression at low energies, showing a sign of strong e-e correlation. At high energy, the differential conductance obeys a power law behavior, which is predicted by the environmental quantum fluctuation theories. At lower energy, we observed a crossover to an exponential dependence, in accordance with recent theoretical calculation. For an analytic description of our data at low temperatures, it would require a nonperturbative theory for the e-e interaction, being consistent with our previous transport measurements on the same batch of MWNTs [1,2].

[1] N. Kang, et al., Phys. Rev. B 66, 241403 (2002). [2] N. Kang, et al., Phys. Rev. B 67, 33404 (2003).