Transport through single-wall metallic carbon nanotubes in the cotunneling regime

Abstract

Using the real-time diagrammatic technique and taking into account both the sequential and cotunneling processes, we analyze the transport properties of single-wall metallic carbon nanotubes coupled to nonmagnetic and ferromagnetic leads in the full range of parameters. In particular, considering the two different shell filling schemes of the nanotubes, we discuss the behavior of the differential conductance, tunnel magnetoresistance and the shot noise. We show that in the Coulomb diamonds corresponding to even occupations, the shot noise becomes super-Poissonian due to bunching of fast tunneling processes resulting from the dynamical channel blockade, whereas in the other diamonds the noise is roughly Poissonian, in agreement with recent experiments. The tunnel magnetoresistance is very sensitive to the number of electrons in the nanotube and exhibits a distinctively different behavior depending on the shell filling sequence of the nanotube.

7 pages, 6 figures

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Cited by in corpus (14)

• Full counting statistics and shot noise of cotunneling in quantum dots and single-molecule transistors
• Spin polarized current and shot noise in carbon nanotube quantum dot in the Kondo regime
• Shot noise spectroscopy on a semiconductor quantum dot in the elastic and inelastic cotunneling regimes
• Counting statistics of cotunneling electrons
• Theoretical studies of spin-dependent electronic transport in ferromagnetically contacted graphene flakes
• Counting quantum jumps: a summary and comparison of fixed-time and fluctuating-time statistics in electron transport
• Manifestation of the shape and edge effects in spin-resolved transport through graphene quantum dots
• Effect of the attachment of ferromagnetic contacts on the conductivity and giant magnetoresistance of graphene nanoribbons
• Distribution of waiting times between electron cotunnelings
• Influence of spin waves on transport through a quantum-dot spin valve
• Measurements of a Quantum Dot with an Impedance-Matching On-Chip LC Resonator at GHz Frequencies
• Exchange effects in spin polarized transport through carbon nanotube quantum dots
• Charge transport through weakly open one dimensional quantum wires
• Current fluctuations of noncollinear single-electron spin-valve transistors