Tunneling current spectroscopy of a nanostructure junction involving multiple energy levels.
A multilevel 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.
Kuo
David M-T
DM
Department of Electrical Engineering, National Central University, Chung-Li, Taiwan.
Chang
Yia-Chung
YC
D049329:Nanostructures; D045663:Quantum Dots; D013057:Spectrum Analysis