Weyl-Majorana solenoid

Baireuther, Paul; Tworzydło, J.; Breitkreiz, Maxim; Adagideli, İnanç; Beenakker, C. W. J.

doi:10.1088/1367-2630/aa50d5

Cited by 25 publications

(23 citation statements)

References 22 publications

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“…As they pass through the center of the Brillouin zone, the chirality blockade is no longer operative and the Fermi arcs acquire a mixed electron-hole character. At k z = 0, the surface states are charge neutral Majorana fermions [24].…”

Section: Fermi-arc Mediated Josephson Effectmentioning

confidence: 99%

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

et al. 2017

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A Weyl semimetal with broken time-reversal symmetry has a minimum of two species of Weyl fermions, distinguished by their opposite chirality, in a pair of Weyl cones at opposite momenta ±K that are displaced in the direction of the magnetization. Andreev reflection at the interface between a Weyl semimetal in the normal state (N) and a superconductor (S) that pairs ±K must involve a switch of chirality, otherwise it is blocked. We show that this "chirality blockade" suppresses the superconducting proximity effect when the magnetization lies in the plane of the NS interface. A Zeeman field at the interface can provide the necessary chirality switch and activate Andreev reflection.

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Section: Fermi-arc Mediated Josephson Effectmentioning

confidence: 99%

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

et al. 2017

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“…1c) and unusual electromagnetic wave transmission [20][21][22][23] (Fig. 1d), and the emergence of Majorana modes when coupled with superconductivity 24 . Therefore, the capability of controlling and modifying the SFAs, especially the switching of SFAs between Weyl-points pairs (see Fig.…”

Section: Introductionmentioning

confidence: 97%

Topological Lifshitz transitions and Fermi arc manipulation in Weyl semimetal NbAs

Yang

Liu

et al. 2019

Nat Commun

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Surface Fermi arcs (SFAs), the unique open Fermi-surfaces (FSs) discovered recently in topological Weyl semimetals (TWSs), are unlike closed FSs in conventional materials and can give rise to many exotic phenomena, such as anomalous SFA-mediated quantum oscillations, chiral magnetic effects, three-dimensional quantum Hall effect, non-local voltage generation and anomalous electromagnetic wave transmission. Here, by using in-situ surface decoration, we demonstrate successful manipulation of the shape, size and even the connections of SFAs in a model TWS, NbAs, and observe their evolution that leads to an unusual topological Lifshitz transition not caused by the change of the carrier concentration. The phase transition teleports the SFAs between different parts of the surface Brillouin zone. Despite the dramatic surface evolution, the existence of SFAs is robust and each SFA remains tied to a pair of Weyl points of opposite chirality, as dictated by the bulk topology.

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“…1 and addressing the question "What is the charge transported along the vortices in a chiral Landau level?" It is known [10] that the charge of Weyl fermions in a superconductor (pair potential ∆ 0 ) is reduced by a factor κ = K(∆ 0 )/K(0). We find a direct manifestation of this charge renormalization in the electrical conductance, which is quantized at 1 2 (eκ) 2 /h per vortex.…”

Section: Introductionmentioning

confidence: 99%

Effect of charge renormalization on the electric and thermoelectric transport along the vortex lattice of a Weyl superconductor

et al. 2019

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Building on the discovery that a Weyl superconductor in a magnetic field supports chiral Landau level motion along the vortex lines, we investigate its transport properties out of equilibrium. We show that the vortex lattice carries an electric current I = 1 2 (Q 2 eff /h)(Φ/Φ0)V between two normal metal contacts at voltage difference V , with Φ the magnetic flux through the system, Φ0 the superconducting flux quantum, and Q eff < e the renormalized charge of the Weyl fermions in the superconducting Landau level. Because the charge renormalization is energy dependent, a nonzero thermo-electric coefficient appears even in the absence of energy-dependent scattering processes.

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Weyl-Majorana solenoid

Cited by 25 publications

References 22 publications

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

Topological Lifshitz transitions and Fermi arc manipulation in Weyl semimetal NbAs

Effect of charge renormalization on the electric and thermoelectric transport along the vortex lattice of a Weyl superconductor

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