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(Seminar)Intrinsic Topological Superconductivity Induced by Textured Magnetic Order
2019-05-10  【 】【打印】【关闭

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

Daniel Steffensen

Affiliation

所在单位

Niels Bohr Institute, University of Copenhagen

Date

日期

2019年5月10日(周五)16:00
 

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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