  In the present work, we theoretically study the nonlinear regime of charge
transport through a quantum dot coupled to the source and drain reservoirs. The
investigation is carried out using a nonequilibrium Green's functions formalism
beyond the Hartree-Fock approximation. Employed approximations for the relevant
Green's functions allow to trace a transition from Coulomb blockade regime to
Kondo regime in the thermoelectric transport. Effects arising when electrons
move in response to thermal gradient applied across the system are discussed,
including experimentally observed thermovoltage zeros.
