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(Seminar)Intrinsic Topological Superconductivity Induced by Textured Magnetic Order
05/10
2019
- Title (Seminar)Intrinsic Topological Superconductivity Induced by Textured Magnetic Order
- Speaker
- Date
- Venue
Abstract
| CAS Key Laboratory of Theoretical Physics | |||
| Institute of Theoretical Physics | |||
| Chinese Academy of Sciences | |||
| Seminar | |||
| Title 题目 | Intrinsic Topological Superconductivity Induced by Textured Magnetic Order | ||
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| Date 日期 |
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| Venue 地点 | Seminar Room 322 Old ITP Building | ||
| Abstract 摘要 | Systems that inherently exhibit topological superconductivity are rare in nature, and the highly coveted Majorana fermions are therefore mainly pursued in engineered hybrid devices. In this talk, I will present how to harness the possible microscopic coexistence of superconductivity and magnetism, as an alternative pathway to craft intrinsic topological superconductors. I will focus on materials with spontaneous textured magnetic order driven by Fermi surface nesting. This work is motivated by the iron pnictides, in which such a coexistence has been shown experimentally [1], and a recent theoretical analysis [2] has revealed that textured magnetism is also accessible. I will discuss the arising topological superconducting phases in layered multiband materials with magnetic spiral, whirl or skyrmion order, coexisting with various types of spin-singlet superconductivity. The diverse magnetic phases lead to a variety of flat, unidirectional, helical and chiral Majorana edge modes. As I will demonstrate, this multifaceted manifestation of Majorana fermion modes stems from the interplay of topological phases with both gapped and nodal bulk energy spectra. [1] L. Wang et al., PRB 93, 014514 (2016). [2] M. H. Christensen, B. M. Andersen and P. Kotetes, PRX 8, 041022 (2018). | ||
| Contact Person 所内联系人 | Panagiotis Kotetes | ||