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We have made a simple and natural modification of a recent quantumrefrigerator model presented by Cleuren et al. in Phys. Rev, Lett.108, 120603(2012). The original model consist of two metal leads acting as heat baths, anda set of quantum dots that allow for electron transport between the baths. Itwas shown to violate the dynamic third law of thermodynamics (theunattainability principle, which states that cooling to absolute zero in finitetime is impossible), but by taking into consideration the finite energy levelspacing in metals we restore the third law, while keeping all of the originalmodel's thermodynamic properties intact.

Cooling by Heating: Restoration of the Third Law of Thermodynamics