Nonuniform carrier density in Cd3As2 evidenced by optical spectroscopy

Crassee, I.; Martino, E.; Homes, C. C.; Caha, O.; Novak, J.; Tuckmantel, P.; Hakl, M.; Nateprov, A.; Arushanov, E.; Gibson, Q. D.; Cava, R. J.; Koohpayeh, S. M.; Arpino, K. E.; McQueen, T. M.; Orlita, M.; Akrap, Ana

doi:10.1103/PhysRevB.97.125204

Title: Nonuniform carrier density in ${Cd}_{3} {As}_{2}$ evidenced by optical spectroscopy

Journal Article · Thu Mar 22 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.125204· OSTI ID:1430846

Crassee, I. ^[1]; Martino, E. ^[2]; Homes, C. C. ^[3]; Caha, O. ^[4]; Novak, J. ^[4]; Tuckmantel, P. ^[5]; Hakl, M. ^[1]; Nateprov, A. ^[6]; Arushanov, E. ^[6]; Gibson, Q. D. ^[7]; Cava, R. J. ^[7]; Koohpayeh, S. M. ^[8]; Arpino, K. E. ^[9]; McQueen, T. M. ^[10]; Orlita, M. ^[11]; Akrap, Ana ^[5]

CNRS National Lab. for Intense Magnetic Fields (LNCMI), Grenoble (France)
Swiss Federal Inst. of Technology (EPFL), Ecublens (Switzerland). Inst. of Physics (IPHYS)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Masaryk Univ., Brno (Czech Republic); Central European Inst. of Technology (CEITEC), Brno (Czech Republic)
Univ. of Geneva (Switzerland). Dept. of Quantum Matter Physics (DQMP)
Academy of Sciences of Moldova, Chisinau (Moldova). Inst. of Applied Physics
Princeton Univ., NJ (United States). Dept. of Chemistry
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry. Dept. of Materials Science and Engineering
CNRS National Lab. for Intense Magnetic Fields (LNCMI), Grenoble (France); Charles Univ., Prague (Czech Republic). Inst. of Physics

In this paper, we report the detailed optical properties of Cd₃As₂ 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 μm, 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 (~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. Finally, magnetoreflectivity and Kerr rotation are consistent with electronlike charge carriers and a spatially nonuniform carrier density.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Johns Hopkins Univ., Baltimore, MD (United States); Univ. of Geneva (Switzerland); Swiss Federal Inst. of Technology (EPFL), Ecublens (Switzerland); CNRS National Lab. for Intense Magnetic Fields (LNCMI), Grenoble (France)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); David and Lucile Packard Foundation (United States); Swiss National Science Foundation (SNSF); European Research Council (ERC); French National Research Agency (ANR)

Grant/Contract Number:: SC0012704; FG02-08ER46544; LQ1601; 692034

OSTI ID:: 1430846

Alternate ID(s):: OSTI ID: 1427882

Report Number(s):: BNL-203366-2018-JAAM; TRN: US1802505

Journal Information:: Physical Review B, Vol. 97, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Cited By (2)

Ultrafast photocarrier dynamics in a 3D Dirac semimetal Cd ₃ As ₂ film studied with terahertz spectroscopy Zhang, Wenjie; Yang, Yunkun; Suo, Peng Applied Physics Letters, Vol. 114, Issue 22 https://doi.org/10.1063/1.5086085	journal	June 2019
Surface superconductivity in a three-dimensional ${Cd}_{3} {As}_{2}$ semimetal at the interface with a gold contact Shvetsov, O. O.; Esin, V. D.; Timonina, A. V. Physical Review B, Vol. 99, Issue 12 https://doi.org/10.1103/physrevb.99.125305	journal	March 2019

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Title: Nonuniform carrier density in Cd 3 As 2 evidenced by optical spectroscopy

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Title: Nonuniform carrier density in ${Cd}_{3} {As}_{2}$ evidenced by optical spectroscopy