Tunneling current spectroscopy of a nanostructure junction involving multiple energy levels

Details Tunneling current spectroscopy of a nanostructure junction involving multiple energy levels Tunneling current spectroscopy of a nanostructure junction involving multiple energy levels

2007-02-05

arxiv.org/abs/cond-mat/0702095v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages and 4 figures

Scientific paper

10.1103/PhysRevLett.99.086803

A multi-level Anderson model is employed to simulate the system of a nanostructure tunnel junction with any number of one-particle energy levels. The tunneling current, including both shell-tunneling and shell-filling cases, is theoretically investigated via the nonequilibrium Green's function method. We obtain a closed form for the spectral function, which is used to analyze the complicated tunneling current spectra of a quantum dot or molecule embedded in a double-barrier junction. We also show that negative differential conductance can be observed in a quantum dot tunnel junction when the Coulomb interactions with neighboring quantum dots are taken into account.

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