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| (Seminar)Intrinsic Topological Superconductivity Induced by Textured Magnetic Order |
| 2019-05-10
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| 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 | | Speaker 报告人 | | | Affiliation 所在单位 | | Niels Bohr Institute, University of Copenhagen | | | Date 日期 | | | 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 |
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