Tunneling current spectroscopy of a nanostructure junction involving multiple energy levels

Abstract

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.

4 pages and 4 figures

References in corpus (5)

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• Electron transport through a metal-molecule-metal junction
• Imaging and spectroscopy of artificial-atom states in core/shell nanocrystal quantum dots
• Selection Rules for Transport Excitation Spectroscopy of Few-Electron Quantum Dots
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• Quantum interference and electron correlation in charge transport through triangular quantum dot molecules
• Thermal rectification effects of multiple semiconductor quantum dot junctions
• Bistable states of quantum dot array junctions for high-density memory
• Bipolar thermoelectric effect in a srially coupled quantum dot system
• Tunneling Current Spectra of a Metal Core/Semiconductor Shell Quantum Dot Molecule
• Bistability in the Tunnelling Current through a Ring of $N$ Coupled Quantum Dots