Thermoelectric effects in nanostructured quantum wires in the non-linear   temperature regime
  The thermoelectric voltage of a quantum dot connected to leads is calculated using the scattering R-matrix method. Our approach takes into account a temperature gradient between the contacts beyond the linear regime. We obtain sign changes of the thermopower when varying the temperature or the chemical potential around the resonances. The influence of the coupling strength of the contacts and of the thermoelectric field on the thermoelectric voltage is discussed. 
Anda Elena Stanciu, George Alexandru Nemnes, Andrei Manolescu
cond-mat.mes-hall