Photovoltaic Chiral Magnetic Effect
Katsuhisa Taguchi, Tatsushi Imaeda, Masatoshi Sato, and Yukio Tanaka
TL;DR
This paper predicts that circularly polarized light can induce a giant electric current in Weyl semimetals through a chiral magnetic effect, with potential applications in optoelectronics.
Contribution
It introduces a theoretical framework for light-induced currents in Weyl semimetals via the chiral magnetic effect, highlighting the role of frequency and spin-momentum locking.
Findings
Effective magnetic field of ~10 Tesla generated by light
Giant electric current proportional to the effective magnetic field
Different behaviors at low and high light frequencies
Abstract
We theoretically predict a generation of a current in Weyl semimetals by applying circularly polarized light. The electric field of the light can drive an effective magnetic field of order of ten Tesla. For lower frequency light, a non-equilibrium spin distribution is formed near the Fermi surface. Due to the spin-momentum locking, a giant electric current proportional to the effective magnetic field is induced. On the other hand, higher frequency light realizes a quasi-static Floquet state with no induced electric current. We discuss relevant materials and estimate order of magnitude of the induced current.
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