PbTe/SnTe heterostructures—candidate platform for studying spin-triplet superconductivity

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This paper explores the potential for spin-triplet superconductivity in molecular beam epitaxy grown PbTe/SnTe semiconductor heterostructures. We present indications of spin-triplet pairing by soft point-contact spectroscopy experiments, using both spin-polarized and unpolarized electrons, and additionally, by a detailed analysis of the upper critical field as inferred from the four probe resistance measurements. The experimental data are described in terms of the Anderson-Brinkman-Morel model of p-wave electron pairing. Our results may be understood in terms of strain-induced topological superconductivity by Tang and Fu (2014 Nat. Phys. 10 964).