Chiral p-wave superconductivity in Pb1−xSnxTe: Signatures from bound-state spectra and wave functions
S. Kundu, V. Tripathi
DOI 10.1103/PhysRevB.99.205105 · Physical Review B
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Abstract
Surface superconductivity has recently been observed on the (001) surface of the topological crystalline insulator Pb1−xSnxTe using point-contact spectroscopy and theoretically proposed to be of the chiral p-wave type. In this paper, we closely examine the conditions for realizing a robust chiral p-wave order in this system rather than conventional s-wave superconductivity. Further, within the p-wave superconducting phase, we identify parameter regimes where impurity bound (Shiba) states depend crucially on the existence of the chiral p-wave order and distinguish them from other regimes where the chiral p-wave order does exist but the impurity-induced subgap bound states cannot be used as evidence for it. Such a distinction can provide an easily realizable experimental test for chiral p-wave order in this system. As a possible application of our findings, we also show that the zero-energy Shiba states in point defects possess an internal SU(2) rotational symmetry which enables them to be useful as quantum qubits.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb1-xSnxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | onset |
| Pb1-xSnxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | Pressure not reported | onset |
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