Gate-induced crossover from unconventional metals to Fermi liquids in multiwalled carbon nanotubes

Kanbara, Takayoshi; Iwasa, Tatsuya; Tsukagoshi, Kazuhito; Aoyagi, Yoshinobu; Iwasa, Yoshihiro
December 2004
Applied Physics Letters;12/27/2004, Vol. 85 Issue 26, p6404
Academic Journal
We observed an ambipolar behavior in multiwalled carbon nanotubes in a backgate configuration, which allowed us to perform systematic inspection of the low-temperature transport properties against gate voltage. The results revealed that a power-law temperature-dependent conductance, which is a sign of an unconventional metallic state, disappears when a high gate voltage is applied, and conductance becomes temperature independent, indicating a normal Fermi liquid state. This demonstrates a field effect tuning of electronic states in nanoscaled materials.


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