• Surface-state plasmons in topological Kondo insulator

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      https://www.ias.ac.in/article/fulltext/pram/096/0116

    • Keywords

       

      Anderson model; topological Kondo insulator; slave-boson protocol; unconventional plasmons; Rashba coupling.

    • Abstract

       

      We studied 2D surface state in the periodic Anderson model of a bulk topological Kondo insulator (TKI) system, involving strongly correlated f orbital electrons screened by d orbital electrons, performing a mean-field theoretic (MFT) calculation within the framework of slave-boson protocol. We found that bulk insulation together with the surface metallicity is possible for the system under infinite-U condition. The possibility of the intraband andthe interband unconventional plasmons with linear dispersion for the surface states without substitutional impurities exists in our report. In fact, our analysis demonstrates that, both type of solutions for the group velocity (v$_g$) andthe phase velocity (v$_p$), viz. (v$_g$, v$_p$) > 0 and (v$_g$ > 0, v$_p$ ≤; 0), could be possible for surface plasmons depending on parameters. The inducement of ‘helical liquids’ in the presence of impurities on the TKI surface is the importantoutcome of this paper. The accessibility of the gapless Dirac spectrum leads to the conventional q$^{1/2}$ spin plasmons. The Kondo screening remains unaffected by Rashba coupling.

    • Author Affiliations

       

      PARTHA GOSWAMI1

      1. D.B. College, University of Delhi, Kalkaji, New Delhi 110 019, India
    • Dates

       
  • Pramana – Journal of Physics | News

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