Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-11-03
J. Appl. Phys. 99, 63710 (2006).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 10 figures, an extension of cond-mat/0406679
Scientific paper
In this paper, we carry out a theoretical analysis of the zero-frequency and finite-frequency shot noise in electron tunneling through a two-level interacting system connected to two leads, when a coherent coupling between the two levels is present, by means of recently developed bias-voltage and temperature dependent quantum rate equations. For this purpose, we generalize the traditional generation-recombination approach for shot noise of two-terminal tunneling devices properly to take into account the coherent superposition of different electronic states (quantum effects). As applications, analytical and numerical investigations have been given in detail for two cases: (1) electron tunneling through a quantum dot connected to ferromagnetic leads with intradot spin-flip scattering, and (2) spinless fermions tunneling through seriesly coupled quantum dots, focusing on the shot noise as functions of bias-voltage and frequency.
Cui Hong-Liang
Djuric Ivana
Dong Bing
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