تقرير
Evidence for Helical Hinge Zero Modes in an Fe-Based Superconductor
العنوان: | Evidence for Helical Hinge Zero Modes in an Fe-Based Superconductor |
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المؤلفون: | Gray, Mason J., Freudenstein, Josef, Zhao, Shu Yang F., OConnor, Ryan, Jenkins, Samuel, Kumar, Narendra, Hoek, Marcel, Kopec, Abigail, Taniguchi, Takashi, Watanabe, Kenji, Zhong, Ruidan, Gu, G. D., Burch, K. S. |
سنة النشر: | 2019 |
المجموعة: | Condensed Matter |
مصطلحات موضوعية: | Condensed Matter - Superconductivity |
الوصف: | Combining topology and superconductivity provides a powerful tool for investigating fundamental physics as well as a route to fault-tolerant quantum computing. There is mounting evidence that the Fe-Based Superconductor FeTe$_{0.55}$Se$_{0.45}$ (FTS) may also be topologically non-trivial. Should the superconducting order be s$^{\pm}$, then FTS could be a higher order topological superconductor with Helical Hinge Zero Modes (HHZM).To test the presence of these modes we developed a new method for making normal metal/superconductor junctions via 2D atomic crystal heterostructures. As expected,junctions in contact with the hinge reveal a sharp zero-bias anomaly whose suppression with temperature and magnetic field only along the c-axis are completely consistent with the presence of HHZM. This feature is completely absent when tunneling purely into the c-axis, and its characteristics are also inconsistent with other origins of zero bias anomalies. Furthermore, additional measurements with soft-point contacts in bulk samples with various Fe interstitial contents demonstrate the intrinsic nature of the observed mode. Thus we provide evidence that FTS is indeed a higher order topological superconductor as well as a new method for probing 2D atomic crystals. |
نوع الوثيقة: | Working Paper |
DOI: | 10.1021/acs.nanolett.9b00844 |
URL الوصول: | http://arxiv.org/abs/1902.10723 |
رقم الأكسشن: | edsarx.1902.10723 |
قاعدة البيانات: | arXiv |
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