Signatures of Majorana doublet in the Fano-Rashba interferometer

We theoretically study the quantum transport through a Fano-Rashba interferometer with an embedded Majorana doublet which generates at one end of the DIII-class topological superconductor. It shows that the Rasbha spin-orbit interaction in the reference arm drives the apparent and terminal-dependence spin polarization of the electron tunneling and crossed Andreev reflection, accompanied by their opposite directions. However, spin degeneracy holds in the local Andreev reflection. Next once the Majorana doublet is replaced by the Andreev bound state, the spin-polarization properties of the Andreev reflections are interchanged. Therefore, the Fano-Rashba interferometer can be a promising candidate for differentiating the Majorana doublet from other bound states.