Chiral magnetic effect in Weyl semimetals: the role of electromagnetic field analysis

by Dr Hiroyuki Fujita (ISSP, University of Tokyo)

Tuesday 17 May 2016, 13:30 → 14:30 Asia/Tokyo

Room 433, Main Research Building (RIKEN Wako)

Date: May 17 (Tue) Time: 13:30 - Place: Main Research bldg. 433 Speaker: Hiroyuki Fujita (ISSP, University of Tokyo) Title: Chiral magnetic effect in Weyl semimetals: the role of electromagnetic field analysis Abstract: For relativistic Weyl fermions in 3+1 dimensions, an electric current proportional to the external magnetic field is predicted. This phenomenon is called Chiral Magnetic Effect (CME) and recent studies on "Weyl semimetals” in condensed matter physics renewed the interest on the subject as a realistic problem which can be investigated experimentally. We found that for the understanding of CME-dominated transport properties of Weyl semimetals, electromagnetic field analysis inside the sample is fundamentally important. First, we found that even in the absence of the external magnetic field, CME drastically changes the electronic transport through Maxwell’s equations to give material-independent universal capacitive response. Second, similar to vibrating drumheads for sound wave, formation of electromagnetic standing wave leads to resonant enhancement of CME current against the external magnetic field under a realistic setup.