| Autor: |
P Baireuther, J A Hutasoit, J Tworzydło, C W J Beenakker |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 18, Iss 4, p 045009 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/18/4/045009 |
| Popis: |
We formulate a linear response theory of the chiral magnetic effect in a finite Weyl semimetal, expressing the electrical current density j induced by a slowly oscillating magnetic field B or chiral chemical potential μ in terms of the scattering matrix of Weyl fermions at the Fermi level. Surface conduction can be neglected in the infinite-system limit for $\delta j/\delta \mu $ , but not for $\delta j/\delta B$ : the chirally circulating surface Fermi arcs give a comparable contribution to the bulk Weyl cones no matter how large the system is, because their smaller number is compensated by an increased flux sensitivity. The Fermi arc contribution to ${\mu }^{-1}\delta j/\delta B$ has the universal value ${(e/h)}^{2}$ , protected by chirality against impurity scattering—unlike the bulk contribution of opposite sign. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
