Projekte pro Jahr
Abstract
Electron-phonon coupling plays an important role for a variety of phenomena like
the modification of low-energy electronic excitations in metals by the coupling to
lattice vibrations, which may influence their transport and thermodynamic
properties. Helium atom scattering (HAS) has been shown to be a sensitive probe
of electron−phonon interaction properties at surfaces. Benedek and colleagues
developed a quantum-theoretical derivation that allows the determination of
electron-phonon coupling parameters λ for metals and metallic thin films from
experimentally measured temperature-dependent helium diffraction intensities and
phonon dispersion curves [1]. By adapting their theory to the case of topological
insulators, we were able to extract an averaged λ from the Debye-Waller
attenuation of the elastic diffraction peaks measured at surface temperatures
between 110 and 355 K [2]. Electron-phonon coupling parameters for the surfaces
of Bi2Se3, Bi2Te3, Bi2Te2Se, and Sb2Te3 were obtained this way. Moreover at the
Bi2Te2Se (111) surface, a charge density wave (CDW) was identified that is
stabilized by a coupling of Dirac topological electronic states to the crystal lattice
via electron-phonon interaction [3].
the modification of low-energy electronic excitations in metals by the coupling to
lattice vibrations, which may influence their transport and thermodynamic
properties. Helium atom scattering (HAS) has been shown to be a sensitive probe
of electron−phonon interaction properties at surfaces. Benedek and colleagues
developed a quantum-theoretical derivation that allows the determination of
electron-phonon coupling parameters λ for metals and metallic thin films from
experimentally measured temperature-dependent helium diffraction intensities and
phonon dispersion curves [1]. By adapting their theory to the case of topological
insulators, we were able to extract an averaged λ from the Debye-Waller
attenuation of the elastic diffraction peaks measured at surface temperatures
between 110 and 355 K [2]. Electron-phonon coupling parameters for the surfaces
of Bi2Se3, Bi2Te3, Bi2Te2Se, and Sb2Te3 were obtained this way. Moreover at the
Bi2Te2Se (111) surface, a charge density wave (CDW) was identified that is
stabilized by a coupling of Dirac topological electronic states to the crystal lattice
via electron-phonon interaction [3].
Originalsprache | englisch |
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Seitenumfang | 1 |
Publikationsstatus | Veröffentlicht - Mai 2023 |
Veranstaltung | 25th International Conference on the Jahn-Teller Effect: JTE 2023 - Virtual Conference, Toronto, Virtual, Kanada Dauer: 14 Mai 2023 → 18 Mai 2023 Konferenznummer: 25 https://jahnteller2023-yorku.ca/index.html |
Konferenz
Konferenz | 25th International Conference on the Jahn-Teller Effect |
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Kurztitel | JTE |
Land/Gebiet | Kanada |
Ort | Toronto, Virtual |
Zeitraum | 14/05/23 → 18/05/23 |
Internetadresse |
Fields of Expertise
- Advanced Materials Science
Projekte
- 1 Abgeschlossen
-
FWF - Material Dynamic - Oberflächendynamik topologischer Materialien
1/01/17 → 30/06/21
Projekt: Forschungsprojekt