Superconductivity Provides Access to the Chiral Magnetic Effect of an Unpaired Weyl Cone.
Phys Rev Lett
; 118(20): 207701, 2017 May 19.
Article
en En
| MEDLINE
| ID: mdl-28581792
ABSTRACT
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/h^{2})µ along the magnetic field at chemical potential µ.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2017
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Article
País de afiliación:
Países Bajos