Transient reflectance of photoexcited Cd{sub 3}As{sub 2}

Berggren, Bryan S.; Arushanov, Ernest; Nateprov, Alex; Hosseini, Tahereh; Kouklin, Nikolai

doi:10.1063/1.4922528

Title: Transient reflectance of photoexcited Cd{sub 3}As{sub 2}

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Abstract

We report ultrafast transient-grating measurements of crystals of the three-dimensional Dirac semimetal cadmium arsenide, Cd{sub 3}As{sub 2}, at both room temperature and 80 K. After photoexcitation with 1.5-eV photons, charge-carriers relax by two processes, one of duration 500 fs and the other of duration 3.1 ps. By measuring the complex phase of the change in reflectance, we determine that the faster signal corresponds to a decrease in absorption, and the slower signal to a decrease in the light's phase velocity, at the probe energy. We attribute these signals to electrons' filling of phase space, first near the photon energy and later at lower energy. We attribute their decay to cooling by rapid emission of optical phonons, then slower emission of acoustic phonons. We also present evidence that both the electrons and the lattice are strongly heated.

Authors:

Berggren, Bryan S. ^[1]; Arushanov, Ernest; Nateprov, Alex ^[2]; Hosseini, Tahereh; Kouklin, Nikolai ^[3]

Department of Physics, Santa Clara University, 500 El Camino Real, Santa Clara, California 95053-0315 (United States)
Institute of Applied Physics, Academy of Sciences of Moldova, Academiei str. 5, MD 2028 Chisinau (Moldova, Republic of)
Departments of Electrical Engineering and Computer Science, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

Publication Date:: Mon Jun 08 00:00:00 EDT 2015

OSTI Identifier:: 22412552

Resource Type:: Journal Article

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 106; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; CADMIUM ARSENIDES; CHARGE CARRIERS; ELECTRONS; EXCITATION; PHASE SPACE; PHASE VELOCITY; PHONONS; PHOTONS; TEMPERATURE RANGE 0273-0400 K; THREE-DIMENSIONAL LATTICES

Citation Formats


                    Weber, C. P., E-mail: cweber@scu.edu, Berggren, Bryan S., Arushanov, Ernest, Nateprov, Alex, Hosseini, Tahereh, and Kouklin, Nikolai. Transient reflectance of photoexcited Cd{sub 3}As{sub 2}.  United States: N. p., 2015. 
        Web.  doi:10.1063/1.4922528.

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                    Weber, C. P., E-mail: cweber@scu.edu, Berggren, Bryan S., Arushanov, Ernest, Nateprov, Alex, Hosseini, Tahereh, & Kouklin, Nikolai. Transient reflectance of photoexcited Cd{sub 3}As{sub 2}.  United States.  https://doi.org/10.1063/1.4922528

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                    Weber, C. P., E-mail: cweber@scu.edu, Berggren, Bryan S., Arushanov, Ernest, Nateprov, Alex, Hosseini, Tahereh, and Kouklin, Nikolai. 2015.  
        "Transient reflectance of photoexcited Cd{sub 3}As{sub 2}".  United States.  https://doi.org/10.1063/1.4922528.

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@article{osti_22412552,

  title        = {Transient reflectance of photoexcited Cd{sub 3}As{sub 2}},

  author       = {Weber, C. P., E-mail: cweber@scu.edu and Berggren, Bryan S. and Arushanov, Ernest and Nateprov, Alex and Hosseini, Tahereh and Kouklin, Nikolai},

  abstractNote = {We report ultrafast transient-grating measurements of crystals of the three-dimensional Dirac semimetal cadmium arsenide, Cd{sub 3}As{sub 2}, at both room temperature and 80 K. After photoexcitation with 1.5-eV photons, charge-carriers relax by two processes, one of duration 500 fs and the other of duration 3.1 ps. By measuring the complex phase of the change in reflectance, we determine that the faster signal corresponds to a decrease in absorption, and the slower signal to a decrease in the light's phase velocity, at the probe energy. We attribute these signals to electrons' filling of phase space, first near the photon energy and later at lower energy. We attribute their decay to cooling by rapid emission of optical phonons, then slower emission of acoustic phonons. We also present evidence that both the electrons and the lattice are strongly heated.},

  doi          = {10.1063/1.4922528},

  url          = {https://www.osti.gov/biblio/22412552},
  journal      = {Applied Physics Letters},

  issn         = {0003-6951},

  number       = 23,

  volume       = 106,

  place        = {United States},

  year         = {Mon Jun 08 00:00:00 EDT 2015},

  month        = {Mon Jun 08 00:00:00 EDT 2015}

}

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