Ultrafast atomic diffusion inducing a reversible (2√3x2√3) R30º ↔ (√3x√3) R30º transition on Sn/Si (111)∶B
Dynamical phase transitions are a challenge to identify experimentally and describe theoretically. Here, we study a new reconstruction of Sn on silicon and observe a reversible transition where the surface unit cell divides its area by a factor of 4 at 250 degrees C. This phase transition is explain...
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/23154 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/23154 |
| Access Level: | acceso abierto |
| Palabra clave: | 538.9 Charge-density-wave Phase-transition Semiconductor surface Superconductivity Sn/Ge(Iii) Order Metal Física de materiales |
| Sumario: | Dynamical phase transitions are a challenge to identify experimentally and describe theoretically. Here, we study a new reconstruction of Sn on silicon and observe a reversible transition where the surface unit cell divides its area by a factor of 4 at 250 degrees C. This phase transition is explained by the 24-fold degeneracy of the ground state and a novel diffusive mechanism, where four Sn atoms arranged in a snakelike cluster wiggle at the surface exploring collectively the different quantum mechanical ground states. |
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