Giant electron-phonon interaction for a prototypical semiconductor interface: Sn/ Ge(111)-(3×3)
We report an experimental and theoretical study of the electron-phonon coupling for α-Sn/Ge(111), a prototypical triangular lattice surface, closely related to Sn/Si(111)-(3×3), where recent experimental evidence has found superconductivity [X. Wu, Phys. Rev. Lett. 125, 117001 (2020)0031-900710.1103...
| Autores: | , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/710980 |
| Acceso en línea: | http://hdl.handle.net/10486/710980 https://dx.doi.org/10.1103/PhysRevB.107.045303 |
| Access Level: | acceso abierto |
| Palabra clave: | Scanning Tunnelling Microscopy Adatoms Tin Física |
| Sumario: | We report an experimental and theoretical study of the electron-phonon coupling for α-Sn/Ge(111), a prototypical triangular lattice surface, closely related to Sn/Si(111)-(3×3), where recent experimental evidence has found superconductivity [X. Wu, Phys. Rev. Lett. 125, 117001 (2020)0031-900710.1103/PhysRevLett.125.117001]. We concentrate our study on the (3×3) phase of α-Sn/Ge(111) that appears between 150 and 120 K and has a well-known geometry with a half-filled electronic band around the Fermi energy. We show that this surface presents a giant electron-phonon interaction that can be considered at least partially responsible for the different phases that this system shows at very low temperature. Our theoretical results indicate that indeed the electron-phonon interaction in α-Sn/Ge(111)-(3×3) is unusually large, since we find that λ, the electron mass enhancement for the half-filled band, is λ=1.3. This result is in good agreement with the experimental value obtained from high-resolution angle-resolved photoemission spectroscopy measurements, which yield λ=1.45±0.1 |
|---|