SQUID measurements on multilayer WTe2 show asymmetric interference patterns and a sawtooth current-phase relation at the edge, indicating ballistic supercurrent over 600 nm as evidence for second-order topological insulator character.
This yields Tc ≃ 250 mK, and Ebulk T h ≃ 65 mK ≈ 6 µeV, much less than the superconducting gap, which is greater than 2 K, confirming the disordered long junction regime
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Probing the topological protection of edge states in multilayer tungsten ditelluride with the superconducting proximity effect
SQUID measurements on multilayer WTe2 show asymmetric interference patterns and a sawtooth current-phase relation at the edge, indicating ballistic supercurrent over 600 nm as evidence for second-order topological insulator character.