Abstract
We give an elementary derivation of the chiral magnetic effect based on a strong magnetic field lowest-Landau-level projection in conjunction with the well-known axial anomalies in two- and four-dimensional space-time. The argument is general, based on a Schur decomposition of the Dirac operator. In the dimensionally reduced theory, the chiral magnetic effect is directly related to the relativistic form of the Peierls instability, leading to a spiral form of the condensate, the chiral magnetic spiral. We then discuss the competition between spin projection, due to a strong magnetic field, and chirality projection, due to an instanton, for light fermions in QCD and QED. The resulting asymmetric distortion of the zero modes and near-zero modes is another aspect of the chiral magnetic effect.
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Notes
- 1.
Spontaneous symmetry breaking in two dimensions is a delicate subject whose details are beyond the scope of our topic. It suffices to mention that in the limit of large number of flavors it can be realized, for example in the Gross-Neveu model [28].
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Acknowledgements
We thank T. Blum, D. Kharzeev and H-U. Yee for helpful discussions. This work was supported by the US Department of Energy under grants DE-FG02-92ER40716 (GD) and DE-AC02-98CH10886, DE-FG-88ER41723 (GB).
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Başar, G., Dunne, G.V. (2013). The Chiral Magnetic Effect and Axial Anomalies. In: Kharzeev, D., Landsteiner, K., Schmitt, A., Yee, HU. (eds) Strongly Interacting Matter in Magnetic Fields. Lecture Notes in Physics, vol 871. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37305-3_10
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