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Non-local pairing processes at the edge of a two-dimensional topologicalinsulator in proximity to an $s$-wave superconductor are usually suppressed byhelicity. However, additional proximity of a ferromagnetic insulator cansubstantially influence the helical constraint and therefore open a newconduction channel by allowing for crossed Andreev reflection (CAR) processes.We show a one-to-one correspondence between CAR and the emergence ofodd-frequency triplet superconductivity. Hence, non-local transport experimentsthat identify CAR in helical liquids yield smoking-gun evidence forunconventional superconductivity. Interestingly, we identify a setup --composed of a superconductor flanked by two ferromagnetic insulators -- thatallows us to favor CAR over electron cotunneling which is known to be adifficult but essential task to be able to measure CAR.

Odd-Frequency Triplet Superconductivity at the Helical Edge of a Toplogical Insulator