Magneto-optical properties of n-type InAsP films in ultrahigh magnetic fields

ORAL

Abstract

InAsP ternary alloys have immense prospect for optoelectronic and quantum communication devices due to their variable band gap of 0.35-1.35 eV and tunability in the g-factors. We present a theoretical/experimental study of the magneto-optical properties of n-type InAsxP1−x films (x=0.07,0.34) in ultrahigh magnetic fields in the Faraday’s geometry at T=300 K using k.p method with modified 8-band Pidgeon-Brown model. The calculated Landau-level Fan diagram for x=0.34 suggests a near-zero g-factor. Moreover, the Field-dependent Fermi levels and the absorption coefficients show a very strong corroboration with the Cyclotron Resonance (CR) measurements, both in position and the strength. In this study, we also employed ultrafast Time Resolved Differential Reflectivity (TRDR) and ultrafast time resolved Magneto-optic Kerr Effect (MOKE) to provide information on the carrier and spin relaxation dynamics.

*This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-17-1-0341, and DURIP funding (FA9550-16-1-0358).

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Presenters

  • Sunil K Thapa

    • University of Florida
    • Univ. of Florida

Authors

  • Sunil K Thapa

    • University of Florida
    • Univ. of Florida

  • Christopher J Stanton

    • Univ. of Florida
    • University of Florida

  • Brenden A Magill

    • Virginia Tech

  • Rathsara R Herath Mudiyanselage

    • Virginia Tech

  • Giti Khodaparast

    • Virginia Tech

  • Y. H. Matsuda

    • University of Tokyo
    • Univ. of Tokyo
    • Institute for Solid State Physics, University of Tokyo

  • Zhuo Yang

    • University of Tokyo
    • Univ. of Tokyo

  • Yoshimitsu Kohama

    • Tokyo University
    • University of Tokyo
    • Univ. of Tokyo
    • ISSP, The University of Tokyo

  • Sukgeun Choi

    • Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA
    • Univ. of California, Santa Barbara
    • Electrical and Computer Engineering Department, University of California, Santa Barbara
    • University of California Santa Barbara

  • Chris J Palmstrom

    • Materials Department, University of California, Santa Barbara
    • UCSB
    • Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara
    • Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA
    • Univ. of California, Santa Barbara
    • Electrical and Computer Engineering Department, University of California, Santa Barbara
    • University of California, Santa Barbara
    • IEE, UC Santa Barbara
    • University of California Santa Barbara
    • Univ of California, Santa Barbara
    • Electrical and Computer Engineering, University of California Santa Barbara
    • Materials and Electrical & Comp. Eng, University of California, Santa Barbara