Plasmon-polaron of the topological metallic surface states

Abstract

We report a plasmon-polaron mode of a 2D electron gas occupying surface states of a 3D topological crystal. This new, low-frequency, acoustic plasmon mode splits-off from the conventional spin-plasmon mode as a result of strong interactions of the surface electrons with bulk phonons. We show that, like in the case of the conventional spin-plasmon, the scattering of this mode is strongly suppressed in some regions of the phase space. This signature of the topological protection leads to an Umklapp-free mode dispersion at the Brillouin zone boundary. Such a plasmon polaron mode has indeed been recently observed in the topological metal Be2Se3.

References in corpus (8)

• Topological Insulator Materials
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Collective modes of the massless Dirac plasma
• Collective modes of a helical liquid
• The quasiparticle spectral function in doped graphene
• Collective excitations on a surface of topological insulator
• Anomalous Acoustic Plasmon Mode from Topologically Protected States
• Tunable Intrinsic Plasmons due to Band Inversion in Topological Materials

Cited by in corpus (9)

• THz Surface Modes and Electron-Phonon Coupling in Bi${}_2$Se${}_3$(111)
• Surface Josephson plasma waves in a high-temperature superconductor
• Topologically Nontrivial Interband Plasmons in Type-II Weyl Semimetal MoTe${}_2$
• Electronic correlation determining correlated plasmons in Sb-doped Bi${}_2$Se${}_3$
• Electronic properties of the Dirac and Weyl systems with first- and higher-order dispersion in non-Fermi-liquid picture
• Electronic properties and polaronic dynamics of semi-Dirac system within ladder approximation
• Attractive polaron formed in doped nonchiral/chiral parabolic system within ladder approximation
• Attractive polaron in a Dirac system within the ladder approximation
• Composite polaron formed on surface of two-dimensional lattice system in weak coupling regime