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We analyze the linear thermoelectric transport properties of devices withthree quantum dots in a star configuration. A central quantum dot istunnel-coupled to source and drain electrodes and to two additional quantumdots. For a wide range of parameters, in the absence of an external magneticfield, the system is a singular Fermi liquid with a non-analytic behavior ofthe electric transport properties at low energies. The singular behavior isassociated with the development of a ferromagnetic or an underscreened Kondoeffect, depending on the parameter regime. A magnetic field drives the systeminto a regular Fermi liquid regime and leads to a large peak ($\sim k_B/|e|$)in the spin thermopower as a function of the temperature, and to a $\sim 100\%$spin polarized current for a wide range of parameters due to interferenceeffects. We find a qualitatively equivalent behavior for systems with a largernumber of side coupled quantum dots, with the maximum value of the spinthermopower decreasing as the number of side-coupled quantum dots increases.

Spin filtering and thermopower in star coupled quantum dot devices