Valley-dependent impurity scattering in α-T3 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