Thermoelectric efficiency at maximum power in a quantum dot
  We identify the operational conditions for maximum power of a nanothermoelectric engine consisting of a single quantum level embedded between two leads at different temperatures and chemical potentials. The corresponding thermodynamic efficiency agrees with the Curzon-Ahlborn expression up to quadratic terms in the gradients, supporting the thesis of universality beyond linear response. 
Massimiliano Esposito, Katja Lindenberg, Christian Van den Broeck