Magnetic manipulation of topological states in p-wave superconductors

Maria Teresa Mercaldo; Mario Cuoco; Panagiotis Kotetes

doi:10.1016/j.physb.2017.11.007

Magnetic manipulation of topological states in p-wave superconductors

Maria Teresa Mercaldo^*, Mario Cuoco, Panagiotis Kotetes

^*Corresponding author af dette arbejde

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6 Citationer (Scopus)

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.

Originalsprog	Engelsk
Tidsskrift	Physica B: Condensed Matter
Vol/bind	536
Sider (fra-til)	730-733
Antal sider	4
ISSN	0921-4526
DOI	https://doi.org/10.1016/j.physb.2017.11.007
Status	Udgivet - 2018

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10.1016/j.physb.2017.11.007

Citationsformater

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title = "Magnetic manipulation of topological states in p-wave superconductors",

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.",

keywords = "Magnetic effects, P-wave superconductors, Topological phases",

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AU - Mercaldo, Maria Teresa

AU - Cuoco, Mario

AU - Kotetes, Panagiotis

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N2 - 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.

AB - 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.

KW - Magnetic effects

KW - P-wave superconductors

KW - Topological phases

U2 - 10.1016/j.physb.2017.11.007

DO - 10.1016/j.physb.2017.11.007

M3 - Conference article

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SN - 0921-4526

VL - 536

SP - 730

EP - 733

JO - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics

JF - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics

ER -

Magnetic manipulation of topological states in p-wave superconductors

Abstract

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