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Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor
- Source :
- Phys. Rev. B 110, 064511 (2024)
- Publication Year :
- 2021
-
Abstract
- A lateral Josephson junction in which the surface of a 3D topological insulator serves as the weak link should support topologically protected excitations related to Majorana fermions. The resulting $4\pi$-periodic current-phase relationship could be detected under high-frequency excitation by the suppression of odd Shapiro steps. Here, we demonstrate such devices through the self-formation of a Pd-Te superconducting layer from a telluride topological insulator, and observe suppressed first and third Shapiro steps. Other devices, including those where the Pd-Te layer is bolstered by an additional Al layer, show no suppression of Shapiro steps, a difference supported by simulations. Though we rule out the known trivial causes of suppressed Shapiro steps in our devices, we nevertheless argue that corroborating measurements and disorder-aware theoretical descriptions of these systems are needed before confidently claiming the observation of Majorana states.<br />Comment: 10 pages, 5 figures, plus Supplemental Material
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 110, 064511 (2024)
- Publication Type :
- Report
- Accession number :
- edsarx.2110.01039
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.110.064511