Classifying Induced Superconductivity in Atomically Thin Dirac-Cone Materials
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摘要: Recently, Kayyalha et al. (Phys. Rev. Lett., 2019, 122, 047003) reported on the anomalous enhancement of self-field critical currents (Ic(sf,T)) at low temperatures in Nb/BiSbTeSe2-nanoribbon/Nb Josephson junctions. The was attributed to low-energy Andreev-bound states arising from winding electronic wave function around circumference topological insulator BiSbTeSe2 nanoribbon. It should be noted that identical Ic(sf,T) and upper field (Bc2(T)) approximately same reduced temperatures, were by several research groups atomically thin junctions based a variety Dirac-cone materials (DCM) earlier. analysis shows all these S/DCM/S systems, is due new superconducting band opening. Taking into account intrinsic superconductors also exhibit effect band(s) opening when sample thickness becomes thinner than out-of-plane coherence length (ξc(0)), we reaffirm our previous proposal there phenomenon additional films.
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