Spin and charge Nernst effect in a four-terminal double-dot interferometer

We investigate the spin and charge Nernst effect of a four-terminal Aharonov-Bohm interferometer with Rashba spin-orbit interaction (RS01). It is shown that a pure spin Nernst effect or a fully spin-polarized Nernst effect can be obtained by modulating the magnetic flux phase phi and the RSOI induced phase phi. It is also demonstrated that some windows of phi (or phi) for maintaining an almost fully spin-polarized Nernst effect exist and their width is under the control of the other phase. Moreover, for the charge Nernst coefficient N, and spin Nernst coefficient Ns the relationship N-c(phi,phi)= N-s(phi, phi) always holds. These results suggest that our proposal may act as a controllable thermospin generator. (C) 2018 Elsevier B.V. All rights reserved.