Low-energy bandstructure, electronic states and Berry phases in α-T<sub>3</sub> materials under external irradiation

POSTER

Abstract

Electron dressed states, or interacting Floquet states, have been derived analytically for α-T3 materials. These arise from the off-resonant coupling of Dirac pseudospin-1 electrons to the external irradiation. Results will be presented over the allowable range of values of the interaction parameter α 0 < α < 1 and for all possible types of incoming light polarizations. For elliptical and circular polarizations, an energy band gap could be opened, there is no longer symmetry between the valence and conduction bands, and the obtained low-energy bandstructure directly depends on the valley index τ . In contrast, applying linearly polarized light could induce α-dependent anisotropy of the dispersions, but there is no change to the flat band. We have obtained and examined the corresponding wave functions, their structure and Berry phases.

*D.H. would like to acknowledge the support from the Air Force Office of Scientific Research (AFOSR). D.H is also
supported by the DoD Lab-University Collaborative Initiative (LUCI) program. G.G. would like to acknowledge the
support from the Air Force Research Laboratory (AFRL) through Grant #12530960.

Presenters

  • Liubov Zhemchuzhna

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

Authors

  • Liubov Zhemchuzhna

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

  • 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

  • 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

  • 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