Origin of the Electron–Phonon Interaction of Topological Semimetal Surfaces Measured with Helium Atom Scattering

  title={Origin of the Electron–Phonon Interaction of Topological Semimetal Surfaces Measured with Helium Atom Scattering},
  author={Giorgio Benedek and Salvador Miret-Art{\'e}s and Joseph R Manson and Adrian Ruckhofer and Wolfgang E. Ernst and Anton Tamt{\"o}gl},
  journal={The Journal of Physical Chemistry Letters},
  pages={1927 - 1933}
He atom scattering has been demonstrated to be a sensitive probe of the electron–phonon interaction parameter λ at metal and metal-overlayer surfaces. Here it is shown that the theory linking λ to the thermal attenuation of atom scattering spectra (the Debye–Waller factor) can be applied to topological semimetal surfaces, such as the quasi-one-dimensional charge-density-wave system Bi(114) and the layered pnictogen chalcogenides. The electron−phonon coupling, as determined for several… 

Figures and Tables from this paper

Measuring the Electron–Phonon Interaction in Two-Dimensional Superconductors with He-Atom Scattering
Helium-atom scattering (HAS) spectroscopy from conducting surfaces has been shown to provide direct information on the electron–phonon interaction, more specifically the mass-enhancement factor λ
The Electron–Phonon Interaction of Low‐Dimensional and Multi‐Dimensional Materials from He Atom Scattering
Values of λ obtained using He atoms compare favorably with known values for the bulk materials, and the corresponding analysis indicates, the number of layers contributing to the electron-phonon interaction, which is measured in an atom surface collision.
The electron-phonon coupling constant for single-layer graphene on metal substrates determined from He atom scattering.
It is shown that λ rapidly increases for decreasing graphene-substrate binding strength, and the method is suitable for analysis and characterization of not only the graphene overlayers considered here, but also other layered systems such as twisted graphene bilayers.
Atom-surface van der Waals potentials of topological insulators and semimetals from scattering measurements.
It is demonstrated that atom-surface scattering provides direct experimental information about the atom- surface interaction in the weak physisorption regime and can also be used to determine the lifetime and mean free path of the trapped atom.
Observation of Dirac Charge Density Waves in Bi2Te2Se
While the hexagonal Fermi level contours, often found at the surfaces of topological insulators (TIs) would imply ”strong” nesting conditions, the existence of charge density waves (CDWs) periodic
Observation of Dirac Charge Density Waves in Bi$_2$Te$_2$Se
: While parallel segments in the Fermi level contours, often found at the surfaces of topological insulators (TIs) would imply ”strong” nesting conditions, the existence of charge density waves
Inelastic helium atom scattering from Sb2Te3(111): phonon dispersion, focusing effects and surfing.
An experimental study of inelastic scattering processes on the surface of the topological insulator Sb2Te3 using helium atom scattering using phonon-assisted adsorption of the incident helium atom gives rise to a bound state where the helium atom rides the created Rayleigh wave.
Electron–phonon coupling in superconducting 1T-PdTe2
We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe 2 by means of helium atom scattering. While 1T-PdTe 2 is isostructural with 1T-PtTe 2 , only the former is
Properties and challenges of hot-phonon physics in metals: MgB2 and other compounds
Terahertz surface modes and electron-phonon coupling on Bi2Se3 (111)
We present a study of the surface vibrational modes of the topological insulator (TI) Bi$_2$Se$_3$ using inelastic helium atom scattering (HAS) as well as density functional perturbation theory


Electron-Phonon Coupling Constant of Metallic Overlayers from Specular He Atom Scattering.
It is shown that measurements of the thermal attenuation of the specular He atom diffraction peak (the Debye-Waller effect) can determine the electron-phonon coupling constant, λ, for ultrathin films of metal overlayers on various close-packed metal substrates.
Anomalous behavior in the phonon dispersion of the (001) surface of Bi 2 Te 3 determined from helium atom-surface scattering measurements
We employ inelastic helium atom-surface scattering to measure the low energy phonon dispersion along high-symmetry directions on the surface of the topological insulator Bi$_2$Te$_3$. Results
Electron-Phonon Coupling Strength at Metal Surfaces Directly Determined from the Helium Atom Scattering Debye-Waller Factor.
A new quantum-theoretical derivation of the elastic and inelastic scattering probability of He atoms from a metal surface, where the energy and momentum exchange with the phonon gas can occur only
Interaction of phonons and dirac fermions on the surface of Bi2Se3: a strong Kohn anomaly.
First measurements of phonon dispersion curves on the (001) surface of the strong three-dimensional topological insulator Bi2Se3 reveal a prominent signature of the exotic metallic Dirac fermion quasiparticles, including a strong Kohn anomaly.
Unveiling mode-selected electron-phonon interactions in metal films by helium atom scattering.
A density functional perturbation theory (DFPT) and a helium atom scattering study of the phonon dispersion curves in lead films of up to 7 mono-layers on a copper substrate show that the electron-phonon interaction is responsible for the coupling of He atoms to in-depth phonon modes.
Stability of the Bi 2 Se 3 (111) topological state: Electron-phonon and electron-defect scattering
The electron dynamics of the topological surface state on Bi2Se3(111) is investigated by temperature-dependent angle-resolved photoemission. The electron-phonon coupling strength is determined in a
Phonon-mediated superconductivity in electron-doped single-layer MoS 2 : A first-principles prediction
The electron-phonon interaction in electron-doped single-layer MoS 2 is investigated using first-principles calculations. The electron-phonon coupling is found to be very weak at low doping levels. It
Measurement of an exceptionally weak electron-phonon coupling on the surface of the topological insulator Bi2Se3 using angle-resolved photoemission spectroscopy.
An extremely weak broadening of the topological surface state with temperature and no anomalies in the state's dispersion is found, indicating exceptionally weak electron-phonon coupling, suggesting that topological insulators could serve as a basis for room-temperature electronic devices.
Electron-phonon coupling in topological surface states: The role of polar optical modes
The electron-phonon interaction in the metallic surface state of 3D topological insulators is revised within a first principles framework and an overall weak coupling constant of less than 0.15 is found, guaranteeing long-lived quasiparticles at elevated temperatures.
Mode-selected electron-phonon coupling in superconducting Pb nanofilms determined from He atom scattering.
IHAS is the first experiment providing mode-selected EPC strengths (mode-lambda spectroscopy) and scattering amplitudes from single phonons are shown, by first-principle arguments, to be proportional to the respective EPC strength.