TY - JOUR
T1 - Superconductivity Provides Access to the Chiral Magnetic Effect of an Unpaired Weyl Cone
AU - O'Brien, T. E.
AU - Beenakker, C.W.J.
AU - Adagideli, I.
PY - 2017/5/19
Y1 - 2017/5/19
N2 - 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.
AB - 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.
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000401664000019&KeyUID=WOS:000401664000019
U2 - 10.1103/PhysRevLett.118.207701
DO - 10.1103/PhysRevLett.118.207701
M3 - Article
SN - 0031-9007
VL - 118
JO - Physical review letters
JF - Physical review letters
IS - 20
M1 - 207701
ER -