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Observation of the chiral magnetic effect in ZrTe5
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abstract
The chiral magnetic effect is the generation of electric current induced by chirality imbalance in the presence of magnetic field. It is a macroscopic manifestation of the quantum anomaly in relativistic field theory of chiral fermions (massless spin $1/2$ particles with a definite projection of spin on momentum) -- a dramatic phenomenon arising from a collective motion of particles and antiparticles in the Dirac sea. The recent discovery of Dirac semimetals with chiral quasi-particles opens a fascinating possibility to study this phenomenon in condensed matter experiments. Here we report on the first observation of chiral magnetic effect through the measurement of magneto-transport in zirconium pentatelluride, ZrTe_5. Our angle-resolved photoemission spectroscopy experiments show that this material's electronic structure is consistent with a 3D Dirac semimetal. We observe a large negative magnetoresistance when magnetic field is parallel with the current. The measured quadratic field dependence of the magnetoconductance is a clear indication of the chiral magnetic effect. The observed phenomenon stems from the effective transmutation of Dirac semimetal into a Weyl semimetal induced by the parallel electric and magnetic fields that represent a topologically nontrivial gauge field background.
Forward citations
Cited by 10 Pith papers
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Chiral Magnetic Conductivity in the Tight-Binding Model of Dirac Semimetals
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Out-of-equilibrium Chiral Magnetic Effect via Kubo formulas
First lattice estimate of the out-of-equilibrium CME conductivity in QCD, showing suppression below T_c and approach to perturbation theory at high T.
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Including the neutron skin of zirconium in isobar collision simulations halves the predicted Ru/Zr magnetic-field strength difference from 10% to 5% in peripheral events.
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Magnetic fields in heavy ion collisions: flow and charge transport
Ideal MHD simulations of heavy-ion collisions find that a chiral magnetic field encoded in the initial conditions is transported by the expanding plasma into a late-time electric charge dipole perpendicular to the rea...
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A rotating D7-brane ansatz that switches on the Wess-Zumino term yields an anomaly-enhanced negative magnetoresistance in the D3/D7 model.
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Plasminos in chiral QCD plasma
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Electrical conductivity to temperature ratio in quark matter decreases with increasing chiral chemical potential in the NJL model, most strongly at low temperature.
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Influence of interactions on the chiral effect in $1D$ Dirac semimetal
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