Polarizability and magnetoplasmons for the α-T<sub>3</sub> model

ORAL

Abstract

Godfrey Gumbs, Dipendra Dahal, Antonios Balassis, Andrii Iurov, and Danhong Huang

*The dynamical polarizability is calculated at zero temperature and then employed in the dielectric function to determine the dispersion relation for magnetoplasmons for the α-T3 model. In the absence of magnetic field, the low-energy spectrum consists of a pair of a pair of Dirac cones and a dispersionless (flat) band in the K and K' valleys, i.e., two inequivalent Dirac points in the first Brillouin zone. However, the corresponding wave functions are valley-dependent. The Dirac-Weyl Hamiltonian for this structure with pseudospin S=1 is characterized by a parameter alpha which is a measure of the coupling strength between an additional atom at the center of the honeycomb lattice for the A and B atoms on the rim. We present results for a doped layer in the integer quantum-Hall regime for fixed alpha and various magnetic fields, and chosen magnetic field and different alpha in the random-phase approximation.

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Presenters

  • Godfrey Gumbs

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

Authors

  • Godfrey Gumbs

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

  • Dipendra Dahal

    • Hunter college, CUNY
    • Physics and Astronomy, Hunter college
    • The Graduate Center, City University of New York
    • Hunter college

  • Antonios Balassis

    • Fordham University

  • Andrii Iurov

    • Medgar Evers College
    • Medgar Evers College of City University of New York
    • Medgar Evers college
    • Department of Physics and Computer Science, Medgar Evers College of City University of New York
    • Physics and Astronomy, Medgar Evers College, City University of New York
    • Medgar Evers College of the City University of New York
    • Department of Physics, Medgar Evers College of City University of New York

  • Danhong Huang

    • Air Force Research Lab
    • Air Force Research Laboratory, Kirtland Air Force Base, Albuquerque, NM
    • Kirtland Air Force Research Lab
    • Space Vehicles Directorate, Air Force Research Lab - Kirtland
    • Air Force Research Laboratory
    • Air Force Research Laboratory, Kirtland Airforce Base, Albuquerque, NM