J. Borge, C. Gorini, R. Raimondi
We study the connection between the spin-heat and spin-charge response in a two-dimensional disordered Fermi gas with spin-orbit coupling. We show that the ratio between the above responses can be expressed as the thermopower $S=-(\pi k_B)^2T\sigma'/3e\sigma$ times a number $R_s$ which depends on the strength and type of the spin-orbit couplings considered. We illustrate the general results by examining different two-dimensional electron or hole systems with different and competing spin-orbit mechanisms and conclude that a metallic system could prove much more efficient as a heat-to-spin than as a heat-to-charge converter.
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http://arxiv.org/abs/1211.3839
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