Current properties in a three-terminal quantum-dot ring with spin bias and Rashba interaction

Electronic transport through a triple-quantum-dot ring with three terminals is theoretically studied. By introducing a local Rashba spin-orbit interaction on an individual quantum dot, we find that the spin bias in one terminal drives apparent charge currents with the similar amplitudes and opposite directions of them in the other terminals. This means that in this structure, the spin bias can be measured by virtue of the charge current properties. Meanwhile, the spin transport induced by the spin bias is notable. When a magnetic flux is applied through this ring, we see that it has a nontrivial role in manipulating the charge and the spin transport. Based on the obtained results, we propose this structure can be used as a prototype of a charge and spin current rectifier.