Chiral Magnetic Effect due to Inhomogeneous Magnetic Fields in Noncentrosymmetric Weyl Semimetals
| Autor: | Ibe, Yohei, Sumiyoshi, Hiroaki |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 86, 054707 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7566/JPSJ.86.054707 |
| Popis: | The chiral magnetic effect is a phenomenon where an electromagnetic current is generated along a magnetic field. Recently, in nonequilibrium systems, negative longitudinal magnetoresistance has been observed experimentally in Dirac/Weyl semimetals, which provides evidence for the chiral magnetic effect as a nonequilibrium current. On the other hand, the emergence of the chiral magnetic effect as an equilibrium current is still controversial. We propose a possible realization of the chiral magnetic effect as an equilibrium current using inhomogeneous magnetic fields. By employing tight-binding calculations and linear response theory, we demonstrate that a finite current density is generated by inhomogeneous magnetic fields, while the spatial integration of the current is equal to zero, which is consistent with the so-called "no-go theorem" of the chiral magnetic effect in real lattice systems. Moreover, we propose an experimental setup to detect the effect in Weyl semimetal materials. Comment: 6 pages, 7 figures |
| Databáze: | arXiv |
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