Probing charge pumping and relaxation of the chiral anomaly in a Dirac semimetal
Bing Cheng, Timo Schumann, Susanne Stemmer, N. P. Armitage
Abstract
films and extract their conductivities σ(ω) as a function of E · B. As field is applied, we observe a markedly sharp Drude response that rises out of the broader background. Its appearance is a definitive signature of a new transport channel and consistent with the chiral response, with its spectral weight a measure of the net chiral charge and width a measure of the scattering rate between chiral species. The field independence of the chiral relaxation establishes that it is set by the approximate conservation of the isospin that labels the crystalline point-group representations.
Topics & Concepts
Chiral anomalyPhysicsCondensed matter physicsCharge conservationDirac (video compression format)SemimetalScattering rateCharge (physics)Relaxation (psychology)Measure (data warehouse)Anomaly (physics)ScatteringCharge orderingField (mathematics)Antiparallel (mathematics)Nernst effectMagnetic fieldElectronic band structureElectronOptical conductivityQuantum mechanicsSpectroscopyWeyl semimetalDrude modelPercolation (cognitive psychology)Spin (aerodynamics)ExponentMagnetic momentMuon spin spectroscopyPolingTopological Materials and PhenomenaGraphene research and applicationsQuantum and electron transport phenomena