Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials

Abstract We suggest that spin-singlet pseudo-scalar s-wave superconducting pairing creates a two dimensional sea of Majorana fermions on the surface of three dimensional Dirac superconductors (3DDS). This pseudo-scalar superconducting order parameter Δ5, in competition with scalar Dirac mass m, lead...

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Autores principales:	Morteza Salehi, S. A. Jafari
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/18d1fad2ac5245408cde8d4818bd535c
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spelling	oai:doaj.org-article:18d1fad2ac5245408cde8d4818bd535c2021-12-02T16:07:04ZSea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials10.1038/s41598-017-07298-22045-2322https://doaj.org/article/18d1fad2ac5245408cde8d4818bd535c2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07298-2https://doaj.org/toc/2045-2322Abstract We suggest that spin-singlet pseudo-scalar s-wave superconducting pairing creates a two dimensional sea of Majorana fermions on the surface of three dimensional Dirac superconductors (3DDS). This pseudo-scalar superconducting order parameter Δ5, in competition with scalar Dirac mass m, leads to a topological phase transition due to band inversion. We find that a perfect Andreev-Klein reflection is guaranteed by presence of anomalous Andreev reflection along with the conventional one. This effect manifests itself in a resonant peak of the differential conductance. Furthermore, Josephson current of the Δ5\|m\|Δ5 junction in the presence of anomalous Andreev reflection is fractional with 4π period. Our finding suggests another search area for condensed matter realization of Majorana fermions which are beyond the vortex-core of p-wave superconductors. The required Δ5 pairing can be extrinsically induced by a conventional s-wave superconductor into a three dimensional Dirac material (3DDM).Morteza SalehiS. A. JafariNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Morteza Salehi S. A. Jafari Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
description	Abstract We suggest that spin-singlet pseudo-scalar s-wave superconducting pairing creates a two dimensional sea of Majorana fermions on the surface of three dimensional Dirac superconductors (3DDS). This pseudo-scalar superconducting order parameter Δ5, in competition with scalar Dirac mass m, leads to a topological phase transition due to band inversion. We find that a perfect Andreev-Klein reflection is guaranteed by presence of anomalous Andreev reflection along with the conventional one. This effect manifests itself in a resonant peak of the differential conductance. Furthermore, Josephson current of the Δ5\|m\|Δ5 junction in the presence of anomalous Andreev reflection is fractional with 4π period. Our finding suggests another search area for condensed matter realization of Majorana fermions which are beyond the vortex-core of p-wave superconductors. The required Δ5 pairing can be extrinsically induced by a conventional s-wave superconductor into a three dimensional Dirac material (3DDM).
format	article
author	Morteza Salehi S. A. Jafari
author_facet	Morteza Salehi S. A. Jafari
author_sort	Morteza Salehi
title	Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
title_short	Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
title_full	Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
title_fullStr	Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
title_full_unstemmed	Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
title_sort	sea of majorana fermions from pseudo-scalar superconducting order in three dimensional dirac materials
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/18d1fad2ac5245408cde8d4818bd535c
work_keys_str_mv	AT mortezasalehi seaofmajoranafermionsfrompseudoscalarsuperconductingorderinthreedimensionaldiracmaterials AT sajafari seaofmajoranafermionsfrompseudoscalarsuperconductingorderinthreedimensionaldiracmaterials
_version_	1718384763216068608

Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials

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