TY - JOUR
T1 - Zero-bias anomaly and possible superconductivity in single-walled carbon nanotubes
AU - Zhang, Jian
AU - Tselev, Alexander
AU - Yang, Yanfei
AU - Hatton, Kyle
AU - Barbara, Paola
AU - Shafraniuk, Serhii
PY - 2006
Y1 - 2006
N2 - We report measurements of field-effect transistors made of isolated single-walled carbon nanotubes contacted by superconducting electrodes. For large negative gate voltage, we find a dip in the low-bias differential resistance. Remarkably, this dip persists well above the superconducting transition temperature of the electrodes, indicating that it is not caused by superconducting proximity effect from the electrodes. This conclusion is supported by measurements on carbon nanotubes contacted by normal electrodes showing similar features. One possible explanation is superconductivity in the nanotubes, occurring when the gate voltage shifts the Fermi energy into van Hove singularities of the electronic density of states.
AB - We report measurements of field-effect transistors made of isolated single-walled carbon nanotubes contacted by superconducting electrodes. For large negative gate voltage, we find a dip in the low-bias differential resistance. Remarkably, this dip persists well above the superconducting transition temperature of the electrodes, indicating that it is not caused by superconducting proximity effect from the electrodes. This conclusion is supported by measurements on carbon nanotubes contacted by normal electrodes showing similar features. One possible explanation is superconductivity in the nanotubes, occurring when the gate voltage shifts the Fermi energy into van Hove singularities of the electronic density of states.
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U2 - 10.1103/PhysRevB.74.155414
DO - 10.1103/PhysRevB.74.155414
M3 - Article
AN - SCOPUS:33749859477
SN - 1098-0121
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 15
M1 - 155414
ER -