Superconductivity Provides Access to the Chiral Magnetic Effect of an Unpaired Weyl Cone - INSPIRE

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Superconductivity Provides Access to the Chiral Magnetic Effect of an Unpaired Weyl Cone

Dec 20, 2016

6 pages

Published in:

Phys.Rev.Lett. 118 (2017) 20, 207701

Published: May 19, 2017

e-Print:

1612.06848 [cond-mat.mes-hall]

DOI:

10.1103/PhysRevLett.118.207701

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Abstract: (APS)

The massless fermions of a Weyl semimetal come in two species of opposite chirality, in two cones of the band structure. As a consequence, the current j induced in one Weyl cone by a magnetic field B [the chiral magnetic effect (CME)] is canceled in equilibrium by an opposite current in the other cone. Here, we show that superconductivity offers a way to avoid this cancellation, by means of a flux bias that gaps out a Weyl cone jointly with its particle-hole conjugate. The remaining gapless Weyl cone and its particle-hole conjugate represent a single fermionic species, with renormalized charge e* and a single chirality ± set by the sign of the flux bias. As a consequence, the CME is no longer canceled in equilibrium but appears as a supercurrent response ∂j/∂B=±(e*e/h2)μ along the magnetic field at chemical potential μ.

Note:

12 pages,9 figures, added appendices with the details of the calculations, submitted version

References(57)

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