Superconductivity provides access to the chiral magnetic effect of an unpaired weyl cone

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O’Brien, T. E. and Beenakker, C. W. J. and Adagideli, İnanç (2017) Superconductivity provides access to the chiral magnetic effect of an unpaired weyl cone. Physical Review Letters, 118 (20). ISSN 0031-9007 (Print) 1079-7114 (Online)

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.118.207701


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.

Item Type:Article
Subjects:Q Science > QC Physics
Q Science > QC Physics > QC176-176.9 Solids. Solid state physics
ID Code:32656
Deposited By:İnanç Adagideli
Deposited On:21 Aug 2017 15:17
Last Modified:21 Aug 2017 15:17

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