Thermoelectric effects in Kondo-correlated quantum dots

In this letter we study thermoelectric effects in ultra-small quantum dots. We study the behaviour of the thermopower, Peltier coefficient and thermal conductance both in the sequential tunneling regime and in the regime wher e Kondo correlations develop. Both cases of linear response and non-equilib rium induced by strong temperature gradients are considered. The thermopowe r is a very sensitive tool to detect Kondo correlations. It changes sign as a function of both temperature and temperature gradient. We also discuss v iolations of the Wiedemann-Franz law.