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  1. Home
  3. Research Domains
  5. Physical Sciences
  7. Condensed Matter Physics
  9. Surface Properties Of Condensed Matter
  11. Coexistence Of Isoenergetic Rashba And Dirac Fermions On The Surface Of Centrosymmetric Topological Insulator Decorated With Transition Metals.
  1. Home
  3. Research Domains
  5. Physical Sciences
  7. Condensed Matter Physics
  9. Surface Properties Of Condensed Matter
  11. Coexistence Of Isoenergetic Rashba And Dirac Fermions On The Surface Of Centrosymmetric Topological Insulator Decorated With Transition Metals.

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Coexistence of isoenergetic Rashba and Dirac fermions on the surface of centrosymmetric topological insulator decorated with transition metals.

Giuseppe Cuono1, Rajibul Islam2, Amar Fakhredine3

  • 1Consiglio Nazionale delle Ricerche (CNR-SPIN), Unità di Ricerca presso Terzi c/o Università "G. D'Annunzio", 66100, Chieti, Italy.

Physical Chemistry Chemical Physics : PCCP
|November 5, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Pure Dirac and Rashba fermions coexist on topological insulator surfaces when spatial separation is achieved. This study demonstrates their simultaneous presence in strained PbSe due to non-homogeneity, with Dirac states on the surface and Rashba states in subsurface layers.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Dirac cones arise from bulk topology and surface states at phase boundaries.
  • Rashba states emerge in systems with broken inversion symmetry.
  • Hybridization of Dirac and Rashba bands in centrosymmetric topological insulators leads to the giant Rashba effect, preventing pure states.

Purpose of the Study:

  • To establish conditions for simultaneous hosting of pure Rashba and Dirac surface states in topological systems.
  • To investigate the coexistence of pure Dirac and Rashba fermions in non-homogeneous centrosymmetric topological insulators.
  • To explain the observed phenomena in the (111) polar surface of strained PbSe.

Main Methods:

  • Theoretical investigation of topological crystalline insulators.
  • Focus on the (111) polar surface of PbSe under compressive strain.
  • Analysis of electronic band structures and spatial origins of surface states.

    • Main Results:

    • Pure Dirac and Rashba dispersions can coexist at the same energy in non-homogeneous topological insulators.
    • In strained PbSe(111), a metallic overlayer induces an electric field causing Rashba splitting in subsurface layers.
    • Dirac states are localized on the surface, while Rashba states originate from subsurface layers.

    Conclusions:

    • Spatial separation of Dirac and Rashba states is crucial for their coexistence.
    • Non-homogeneity, induced by factors like metallic overlayers, enables the simultaneous presence of pure Dirac and Rashba fermions.
    • The findings align with experimental observations in PbSe, validating the theoretical model.