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Magnetic manipulation of topological states in p-wave superconductors.

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Bibliographic Details
Title: Magnetic manipulation of topological states in p-wave superconductors.
Authors: Mercaldo, Maria Teresa1 mtm@physics.unisa.it, Cuoco, Mario1,2, Kotetes, Panagiotis3
Source: Physica B. May2018, Vol. 536, p730-733. 4p.
Subjects: Superconductors, Topological spaces, Heterostructures, Magnetic fields, Majorana fermions, Hopping conduction
Abstract: Substantial experimental investigation has provided evidence for spin-triplet pairing in diverse classes of materials and in a variety of artificial heterostructures. One of the fundamental challenges in this framework is how to manipulate the topological behavior of p-wave superconductors (PSC). In this work we investigate the magnetic field response of one-dimensional (1d) PSCs and we focus on the relation between the structure of the Cooper pair spin-configuration and the occurrence of topological phases with an enhanced number N of Majorana fermions per edge. The topological phase diagram, consisting of phases harboring Majorana modes, becomes significantly modified when one tunes the strength of the applied field, the direction of the d -vector and allows for long range hopping amplitudes in the 1d PSC. We find transitions between phases with different number N of Majorana fermions per edge and we show how they can be both induced by a variation of the hopping strength and a spin rotation of d . [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Substantial experimental investigation has provided evidence for spin-triplet pairing in diverse classes of materials and in a variety of artificial heterostructures. One of the fundamental challenges in this framework is how to manipulate the topological behavior of p-wave superconductors (PSC). In this work we investigate the magnetic field response of one-dimensional (1d) PSCs and we focus on the relation between the structure of the Cooper pair spin-configuration and the occurrence of topological phases with an enhanced number N of Majorana fermions per edge. The topological phase diagram, consisting of phases harboring Majorana modes, becomes significantly modified when one tunes the strength of the applied field, the direction of the d -vector and allows for long range hopping amplitudes in the 1d PSC. We find transitions between phases with different number N of Majorana fermions per edge and we show how they can be both induced by a variation of the hopping strength and a spin rotation of d . [ABSTRACT FROM AUTHOR]
ISSN:09214526
DOI:10.1016/j.physb.2017.11.007