Modeling of cotunneling in quantum dot systems

Details Modeling of cotunneling in quantum dot systems Modeling of cotunneling in quantum dot systems

2009-04-21

arxiv.org/abs/0904.3249v2

Physica E 42, 595 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 Figures included, final version with journal information

Scientific paper

10.1016/j.physe.2009.06.069

Transport through nanosystems is treated within the second order von Neumann approach. This approach bridges the gap between rate equations which neglect level broadening and cotunneling, and the transmission formalism, which is essentially based on the single-particle picture thereby treating many-particle interactions on an approximate level. Here we provide an alternative presentation of the method in order to clarify the underlying structure. Furthermore we apply it to the problem of cotunneling. It is shown that both elastic and inelastic cotunneling can be described quantitatively, while the transmission approach with a mean-field treatment of the interaction provides an artificial bistability.

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