تقرير
Beyond the standard model of topological Josephson junctions: From crystalline anisotropy to finite-size and diode effects
| العنوان: | Beyond the standard model of topological Josephson junctions: From crystalline anisotropy to finite-size and diode effects |
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| المؤلفون: | Pekerten, Barış, Brandão, David, Bussiere, Bailey, Monroe, David, Zhou, Tong, Han, Jong E., Shabani, Javad, Matos-Abiague, Alex, Žutić, Igor |
| المصدر: | Applied Physics Letters 124, 252602 (2024) |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity |
| الوصف: | A planar Josephson junction is a versatile platform to realize topological superconductivity over a large parameter space and host Majorana bound states. With a change in Zeeman field, this system undergoes a transition from trivial to topological superconductivity accompanied by a jump in the superconducting phase difference between the two superconductors. A standard model of these Josephson junctions, which can be fabricated to have a nearly perfect interfacial transparency, predicts a simple universal behavior. In that model, at the same value of Zeeman field for the topological transition, there is a $\pi$ phase jump and a minimum in the critical superconducting current, while applying a controllable phase difference yields a diamond-shaped topological region as a function of that phase difference and a Zeeman field. In contrast, even for a perfect interfacial transparency, we find a much richer and nonuniversal behavior as the width of the superconductor is varied or the Dresselhaus spin-orbit coupling is considered. The Zeeman field for the phase jump, not necessarily $\pi$, is different from the value for the minimum critical current, while there is a strong deviation from the diamond-like topological region. These Josephson junctions show a striking example of a nonreciprocal transport and superconducting diode effect, revealing the importance of our findings not only for topological superconductivity and fault-tolerant quantum computing, but also for superconducting spintronics. Comment: Invited to APL Special Topic Issue: "Josephson Junctions and Related Proximity Effects: From Basic Science to Emerging Applications in Advanced Technologies", accepted version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0214920 |
| URL الوصول: | http://arxiv.org/abs/2406.05829 |
| رقم الأكسشن: | edsarx.2406.05829 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0214920 |
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