Dissipationless Spin-Charge Conversion in Excitonic Pseudospin Superfluid

Spin-charge conversion by the inverse spin Hall effect or inverse Rashba-Edelstein effect is prevalent in spintronics but dissipative. We propose a dissipationless spin-charge conversion mechanism by an excitonic pseudospin superfluid in an electron-hole double-layer system. Magnetic exchange fields lift singlet-triplet degeneracy of interlayer exciton levels in the double-layer system. Condensation of the singlet-triplet hybridized excitons breaks both a U(1) gauge symmetry and a pseudospin rotational symmetry around the fields, leading to spin-charge coupled superflow in the system. We demonstrate the mechanism by deriving spin-charge coupled Josephson equations for the excitonic superflow from a coupled quantum-dot model.

Automated summary

In this study, we propose a mechanism for dissipationless spin-charge conversion using excitonic pseudospin superfluid in an electron-hole double-layer system. By lifting the degeneracy of exciton levels through magnetic exchange fields, we achieve spin-charge coupled superflow.