2015/09/30 by Shu Ebihara, Kenji Fukushima, Takashi Oka · 4 citations
Physics and Astronomy · #Charge (physics) #Charge density #Chiral anomaly #Chiral symmetry #Chirality (physics) #Circular polarization #Condensed matter physics #Dirac (video compression format) #Electric field #Fermion #Floquet theory #Hamiltonian (control theory) #Magnetic field #Nambu–Jona-Lasinio model #Physics #Quantum and electron transport phenomena #Quantum electrodynamics #Quantum mechanics #Quantum, superfluid, helium dynamics #Topological Materials and Phenomena #Vector potential #cond-mat.str-el #hep-ph
paper · pdf · doi:10.1103/physrevb.93.155107
published as Phys. Rev. B 93, 155107 (2016) · 6 pages, 3 figures; a new section added to discuss coupling of the CPE and the CME, a wrong sign corrected, typos fixed, elaborated for better readability
arxiv created 2016/01/12 · openalex publication_date 2016/04/06 · arxiv updated 2016/04/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose an experimental setup using 3D Dirac semimetals to access a novel phenomenon induced by the chiral anomaly. We show that the combination of a magnetic field and a circularly polarized laser induces a finite charge density with an accompanying axial current. This is because the circularly polarized laser breaks time-reversal symmetry and the Dirac point splits into two Weyl points, which results in an axial-vector field. We elucidate the appearance of the axial-vector field with the help of the Floquet theory by deriving an effective Hamiltonian for high-frequency electric fields. This anomalous charge density, i.e., the chiral pumping effect, is a phenomenon reminiscent of the chiral magnetic effect with a chiral chemical potential. We explicitly compute the pumped density and the axial-current expectation value. We also take account of coupling to the chiral magnetic effect to calculate a balanced distribution of charge and chirality in a material that behaves as a chiral battery.