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We study transport through a double quantum dot, both in the sequentialtunneling and cotunneling regimes. Using a master equation approach, we findthat, in the sequential tunneling regime, the differential conductance  $G$ as a function of the bias voltage $\Delta\mu$ has a number of satellitepeaks with respect to the main peak of the Coulomb blockade diamond. Theposition of these peaks is related to the interdot tunnel splitting and thesinglet-triplet splitting. We find satellite peaks with both {\em positive} and{\em negative} values of differential conductance for realistic parameterregimes. Relating our theory to a microscopic (Hund-Mulliken) model for thedouble dot, we find a temperature regime for which the Hubbard ratio (=tunnelcoupling over on-site Coulomb repulsion) can be extracted from $G(\Delta\mu)$in the cotunneling regime. In addition, we consider a combined effect ofcotunneling and sequential tunneling, which leads to new peaks (dips) in$G(\Delta\mu)$ inside the Coulomb blockade diamond below some temperaturescales, which we specify.Comment: 16 pages, 10 figure

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