Transport through a double quantum dot in the sequential- and co- tunneling regimes

Details Transport through a double quantum dot in the sequential- and co- tunneling regimes Transport through a double quantum dot in the sequential- and co- tunneling regimes

2003-08-13

arxiv.org/abs/cond-mat/0308241v1

Phys. Rev. B 69, 245327 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 10 figures

Scientific paper

10.1103/PhysRevB.69.245327

We study transport through a double quantum dot, both in the sequential tunneling and cotunneling regimes. Using a master equation approach, we find that, in the sequential tunneling regime, the differential conductance $G$ as a function of the bias voltage $\Delta\mu$ has a number of satellite peaks with respect to the main peak of the Coulomb blockade diamond. The position of these peaks is related to the interdot tunnel splitting and the singlet-triplet splitting. We find satellite peaks with both {\em positive} and {\em negative} values of differential conductance for realistic parameter regimes. Relating our theory to a microscopic (Hund-Mulliken) model for the double dot, we find a temperature regime for which the Hubbard ratio (=tunnel coupling over on-site Coulomb repulsion) can be extracted from $G(\Delta\mu)$ in the cotunneling regime. In addition, we consider a combined effect of cotunneling and sequential tunneling, which leads to new peaks (dips) in $G(\Delta\mu)$ inside the Coulomb blockade diamond below some temperature scales, which we specify.

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