Enhancement of Rashba spin-orbit coupling by electron-electron interaction

We studied how the electron-electron (e-e) interaction enhances the strength of the Rashba spin-orbit coupling (RSOC) and opens the possibility of generating a spin-polarized output current from an unpolarized electric current without any magnetic elements. In this regard, we proposed a novel design of a graphene-like junction based on the $e$-$e$ interaction and the $RSOC$. The results showed that the $e$-$e$ interaction with $RSOC$ opens a spin energy gap and extremely enhances the $RSOC$ in this spin energy gap. Interestingly, the junction produces a large spin-polarized current and could act as a high-efficiency spin filter device (nearly 100\% spin polarization) at room temperature even at low Rashba and e-e interaction strengths. However, with an appropriate design, we showed that RSOC could strongly weaken the spin-polarized current and the spin energy gap, which is solely produced by the $e$-$e$ interaction, but a high spin polarization persists in some energy ranges.

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