Thermal magnetoresistance and spin thermopower in C dimers.

We theoretically investigate the spin-related thermoelectric properties in C dimer bridged between zigzag graphene nanoribbon electrodes using the tight-binding model, equilibrium Green's function method, and Landauer-Büttiker transport formalism. By applying a thermal gradient, our proposed device could generate a notable spin thermopower. Moreover, by switching the magnetization of the electrodes, different spin currents, and giant thermal magnetoresistance (MR) can be achieved. Interestingly, various types of C dimers also produce a thermal MR, which is sensitively modified by the gate voltages.