Calendario Attività

Intrinsic Topological Superconductivity Induced by Textured Magnetic Order

Categoria
Seminario
Data
7 Novembre 2019 15:00 - 16:00
Luogo
14 - 15 IV piano St. 9
Affiliation
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

Systems that inherently exhibit topological superconductivity are rare in nature and the highly coveted Majorana fermions are mainly pursued in engineered hybrid devices. In this talk, I propose to harness the possible microscopic coexistence of superconductivity and magnetism as an alternative pathway to craft intrinsic topological superconductors [1]. My focus is 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 [2], and a recent theoretical analysis [3] has revealed that textured magnetism is in principle also accessible in doped BaFe2As2 and LaFeAsO. My collaborators and I have explored the arising topological superconducting phases in layered multiband materials with magnetic spiral, whirl or skyrmion order, coexisting with various types of spin-singlet superconductivity [4]. We find that the diverse magnetic phases lead to a variety of flat, unidirectional, bidirectional, helical and chiral Majorana edge modes. Finally, we reveal that this multifaceted manifestation of Majorana fermion modes stems from the interplay of topological phases with both gapped and nodal bulk energy spectra. [1] P. Kotetes, New J. Phys. 15, 105027 (2013). [2] L. Wang et al., Phys. Rev. B 93, 014514 (2016). [3] M. H. Christensen, B. M. Andersen and P. Kotetes, Phys. Rev. X 8, 041022 (2018). [4] D. Steffensen, M. H. Christensen, B. M. Andersen and P. Kotetes, in preparation.

 
 

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