Year: 2018
Type: article
Abstract: We report the detailed optical properties of ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ crystals in a wide parameter space: temperature, magnetic field, carrier concentration, and crystal orientation. We investigate high-quality crystals synthesized by three different techniques. In all the studied samples, independently of how they were prepared and how they were treated before the optical experiments, our data indicate conspicuous fluctuations in the carrier density (up to 30%). These charge puddles have a characteristic scale of 100 $\ensuremath{\mu}\mathrm{m}$, they become more pronounced at low temperatures, and possibly, they become enhanced by the presence of crystal twinning. The Drude response is characterized by very small scattering rates ($\ensuremath{\sim}1$ meV) for as-grown samples. Mechanical treatment, such as cutting or polishing, influences the optical properties of single crystals, by increasing the Drude scattering rate and also modifying the high-frequency optical response. Magnetoreflectivity and Kerr rotation are consistent with electronlike charge carriers and a spatially nonuniform carrier density.
Institutions: Centre National de la Recherche Scientifique, Laboratoire National des Champs Magnétiques Intenses, Université Grenoble Alpes, École Polytechnique Fédérale de Lausanne, Brookhaven National Laboratory, Masaryk University, Central European Institute of Technology – Masaryk University, University of Geneva, Academy of Sciences of Moldova, Institute of Applied Physics, Princeton University, Johns Hopkins University, Charles University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, David and Lucile Packard Foundation, U.S. Department of Energy, Johns Hopkins University, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Ministerstvo Školství, Mládeže a Tělovýchovy, Central European Institute of Technology, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering
Awards: G1847291448, G222768804, G2354036397, G241279073, G2693309452, G282073063, G2923578696, G3496015395, G357145406, INSTITUTE FOR QSUANTUM MATTER AT JOHNS HOPKINS UNIVERSITY, INSTITUTE FOR QUANTUM MATTER AT JOHNS HOPKINS UNIVERSITY, G4590123327, G4921566333, G5005566375, CEITEC 2020, G5648016710, G5716134306, G5765906131, G663499466, G6965541988, G7463374569, G872144517
OpenAlex ID: W2773568060