title: Emergent Electromagnetic Induction and Adiabatic Charge Pumping in Noncentrosymmetric Weyl Semimetals.
abstract: The photovoltaic effect due to the adiabatic quantum phase in noncentrosymmetric Weyl semimetals is studied. We particularly focus on the case in which an external ac electric field is applied. By considering a generalized Weyl Hamiltonian with nonlinear terms, we show that the photocurrent is induced by circularly, rather than linearly, polarized light. This photovoltaic current can be understood as an emergent electromagnetic induction in momentum space; the Weyl node is a magnetic monopole in momentum space, the circular motion of which induces the electric field. This result is distinct from conventional photovoltaic effects, and the estimated photocurrent is ∼10^{-1}-10^{1}  nA, which can be detected experimentally.
authors.affiliation: Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ishizuka
authors.affiliation: Department of Physics, Chuo University, 1-13-27 Kasuga, Bunkyo, Tokyo 112-8551, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Hayata
authors.affiliation: Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan.|RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.
authors.forename: Masahito
authors.initials: M
authors.lastname: Ueda
authors.affiliation: Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.|RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa