Fine structure in the off-resonance conductance of small Coulomb blockade systems

Abstract

We show how a fine, multiple-peak structure can arise in the off-resonance, zero-bias conductance of Coulomb blockade systems. In order to understand how this effect comes about one must abandon the orthodox, mean-field understanding of the Coulomb blockade phenomenon and consider quantum fluctuations in the occupation of the single-particle electronic levels. We illustrate such an effect with a spinless Anderson-like model for multi-level systems and an equation-of-motion method for calculating Green's functions that combines two simple decoupling schemes.

5 pages, 3 figures, postscript file also available at http://www.pa.uky.edu/~palacios/papers/eom.ps One figure added. Discussion of results extended

References in corpus (5)

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• Molecular junctions in the Coulomb blockade regime: rectification and nesting
• Spin polarized current and shot noise in carbon nanotube quantum dot in the Kondo regime
• Spin-polarized transport through a single-level quantum dot in the Kondo regime
• Bistability in the Tunnelling Current through a Ring of $N$ Coupled Quantum Dots