We compare various recently proposed spin-battery devices which provide source of spin current. We sort them into three types according to the chemical-potential setup: the symmetric dipolar, the asymmetric dipolar, and the unipolar spin batteries. We propose a model in which these three different types of spin battery are coupled to the same quantum dot to generate spin-current transport. We find that the dipolar spin batteries give similar results while very different results are found for the unipolar device.
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Wang et al. (2004) studied this question.
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