Valley-dependent impurity scattering in α-T<sub>3</sub> ααlattices and specific role of Lorentz forces

ORAL

Abstract

We have obtained the angular distribution of extrinsic skew-scattering currents related to a set of randomly-distributed impurities in α-T3 lattices using the Boltzmann moment equations. With the help of the screened second-order Born approximation, we chave alculated the inverse momentum-relaxation-time tensor and revealed the anisotropy which appears to be the source of the angle-dependent currents. The static dielectric function was obtained under the random-phase approximation (RPA). The scattering is also modified by Berry-phase variation and local asymmetry in impurity potentials next to the two inequivalent K and K' valleys. The resulting skew current depends on the electron doping level and is determined by the ratio of energy to momentum relaxation times

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Presenters

  • Danhong Huang

    • Air Force Research Lab - Kirtland
    • Physics, University of New Mexico
    • Air Force Research Labs.
    • Kirtland Airforce Base, Air Force Research Laboratory, Albuquerque, NM
    • Advanced E/O Space Sensors Group, Air Force Research Laboratory
    • US Air Force Research Laboratory
    • Space Vehicles Directorate, Kirtland AFB, Air Force Research Laboratory

Authors

  • Danhong Huang

    • Air Force Research Lab - Kirtland
    • Physics, University of New Mexico
    • Air Force Research Labs.
    • Kirtland Airforce Base, Air Force Research Laboratory, Albuquerque, NM
    • Advanced E/O Space Sensors Group, Air Force Research Laboratory
    • US Air Force Research Laboratory
    • Space Vehicles Directorate, Kirtland AFB, Air Force Research Laboratory

  • Andrii Iurov

    • Center for High Technology Materials, University of New Mexico
    • Physics, University of New Mexico
    • University of New Mexico
    • Center for High Technology Materials, University of New Mexico, Albuquerque, NM
    • Center for High Technology, University of New Mexico

  • Ying-Cheng Lai

    • School of Electrical, Computer and Energy Engineering, Arizona State University

  • Hongya Xu

    • School of Electrical, Computer and Energy Engineering, Arizona State University

  • Godfrey Gumbs

    • Hunter College of the City University of New York, Department of Physics and Astronomy
    • Hunter college
    • Department of Physics & Astronomy, Hunter College of CUNY, New York, NY, USA
    • Hunter College, City University of New York, New York, NY
    • Physics and Astronomy, Hunter College/CUNY
    • Department of Physics and Astronomy, Hunter College of the City University of New York
    • Hunter College, CUNY
    • Physics Department, Hunter College/CUNY