Nonlocal Optical Response in Topological Phase Transitions in the Graphene Family

ORAL

Abstract

We investigate the electromagnetic response of staggered two-dimensional materials of the graphene family, including graphene, silicene, germanene, and stanene, as they are driven through various topological phase transitions using external fields. Utilizing Kubo formalism, we compute their optical conductivity tensor taking into account the frequency and wave vector of the electromagnetic excitations, and study its behavior over the full electronic phase diagram of the materials. We compute the Plasmon dispersion relation for different phases.

*We acknowledge funding from the US Department of Energy grant DE-FG02-06ER46297 and the LANL LDRD program. P.R.-L. also acknowledges partial support from the Spanish grants TerMic (FIS2014-52486-R), and Juan de la Cierva-Incorporacion (IJCI - 2015-25315).

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Presenters

  • Lilia Woods

    • Physics, Univ of South Florida
    • Department of Physics, university of south florida

Authors

  • Lilia Woods

    • Physics, Univ of South Florida
    • Department of Physics, university of south florida

  • Pablo Rodriguez Lopez

    • Theory of Quantum Materials and Solid State Quantum Technologies, Instituto de Ciencia de Materiales de Madrid, CSIC

  • Wilton De Melo Kort-Kamp

    • Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory

  • Diego Alejandro Dalvit

    • Theoretical Division, Los Alamos National Laboratory