تقرير
Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor
| العنوان: | Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor |
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| المؤلفون: | Rosen, Ilan T., Trimble, Christie J., Andersen, Molly P., Mikheev, Evgeny, Li, Yanbin, Liu, Yunzhi, Tai, Lixuan, Zhang, Peng, Wang, Kang L., Cui, Yi, Kastner, M. A., Williams, James R., Goldhaber-Gordon, David |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | 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. Comment: 10 pages, 5 figures, plus Supplemental Material |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2110.01039 |
| رقم الأكسشن: | edsarx.2110.01039 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |