Tunneling into Multiwalled Carbon Nanotubes: Coulomb Blockade and Fano Resonance
W. Yi, L. Lu, H. Hu, Z. W. Pan, S. Xie
TL;DR
This paper investigates tunneling into multiwalled carbon nanotubes, revealing Coulomb blockade effects and Fano resonance phenomena through spectroscopic measurements and theoretical analysis.
Contribution
It provides the first detailed experimental observation of Coulomb interactions and Fano resonance in MWNT tunneling, supported by numerical fitting to quantum-fluctuation theory.
Findings
Strong zero-bias suppression of TDOS due to Coulomb interactions
Asymmetric conductance anomaly near zero bias
Fano resonance observed in strong tunneling regime
Abstract
Tunneling spectroscopy measurements of single tunnel junctions formed between multiwalled carbon nanotubes (MWNTs) and a normal metal are reported. Intrinsic Coulomb interactions in the MWNTs give rise to a strong zero-bias suppression of a tunneling density of states (TDOS) that can be fitted numerically to the environmental quantum-fluctuation (EQF) theory. An asymmetric conductance anomaly near zero bias is found at low temperatures and interpreted as Fano resonance in the strong tunneling regime.
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