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Ultrafast atomic diffusion inducing a reversible (2√3x2√3) R30º ↔ (√3x√3) R30º transition on Sn/Si (111)∶B



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Abuin Herráez, Manuel (2015) Ultrafast atomic diffusion inducing a reversible (2√3x2√3) R30º ↔ (√3x√3) R30º transition on Sn/Si (111)∶B. Physical review letters, 114 (19). ISSN 0031-9007

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URL Oficial: http://dx.doi.org/10.1103/PhysRevLett.114.196101

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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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© 2015 American Physical Society.
This work was supported by the French Agence Nationale de la Recherche (ANR) under Contract SurMott, No. NT-09-618999, and by Spanish Ministerio de Economía y Competitividad, Project No. MAT2014-59966-R.
W. S. and D. G. T. contributed equally to this work.
Articulo firmado por más de 10 autores.

Palabras clave:Charge-density-wave; Phase-transition; Semiconductor surface; Superconductivity; Sn/Ge(Iii); Order; Metal
Materias:Ciencias > Física > Física de materiales
Código ID:41524
Depositado:10 Mar 2017 14:56
Última Modificación:13 Mar 2017 16:08

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