Chiral separation and chiral magnetic effects in a slab: The role of boundaries

E. V. Gorbar, V. A. Miransky, Igor Shovkovy, P. O. Sukhachov

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We study the chiral separation and chiral magnetic effects in a slab of Dirac semimetal of finite thickness, placed in a constant magnetic field perpendicular to its surfaces. We utilize the Bogolyubov boundary conditions with a large Dirac mass (band gap) outside the slab. We find that, in a finite-thickness slab, the axial current density is induced by helicity-correlated standing waves and, as a consequence, is quantized. The quantization is seen in its stepped-shape dependence on the fermion chemical potential and a sawtooth-shape dependence on the thickness of the slab. In contrast to a naive expectation, there is no chiral charge accumulation anywhere in the bulk or at the boundaries of the semimetal. In the same slab geometry, we also find that a nonzero chiral chemical potential induces no electric current, as might have been expected from the chiral magnetic effect. We argue that this outcome is natural and points to the truly nonstatic nature of the latter. By taking into account a nonzero electric field of a double layer near the boundaries of the slab, we find that the low-energy modes under consideration satisfy the continuity equation for axial current density without the anomalous term.

Original languageEnglish (US)
Article number245440
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number24
DOIs
StatePublished - Dec 28 2015

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Metalloids
magnetic effects
Chemical potential
slabs
Current density
Fermions
Electric currents
Energy gap
metalloids
Electric fields
Boundary conditions
Magnetic fields
Geometry
current density
continuity equation
electric current
standing waves
fermions
boundary conditions
electric fields

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Chiral separation and chiral magnetic effects in a slab : The role of boundaries. / Gorbar, E. V.; Miransky, V. A.; Shovkovy, Igor; Sukhachov, P. O.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 24, 245440, 28.12.2015.

Research output: Contribution to journalArticle

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