Effective long-range pairing and hopping in topological nanowires weakly coupled to s-wave superconductors
Huaiqiang Wang, L. B. Shao, Y. X. Zhao, L. Sheng, B. G. Wang, D. Y. Xing
DOI 10.1103/PhysRevB.98.174512 · Physical Review B
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Abstract
In this work, we first formulate an effective theory, which generally captures long-range proximity effects of a surface system weakly coupled to an s-wave superconductor. The long-range proximity effects include both the emergent long-range pairing and hopping interactions in the surface system. We then model the Rashba spin-orbit-coupled nanowire in proximity with an s-wave superconductor by taking into account the emergent nonlocal effects in the weak-coupling limit. In this limit, the induced superconducting pair potential is found to be much smaller than that of the host superconductor, which is in good agreement with recent experiments. Compared with the previously considered strong-coupling limit with local proximity effects, the long-range interactions can significantly modify the topological phase diagram and considerably lower the threshold magnetic field for the emergence of Majorana zero modes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| InSb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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