Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.196101
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Funding
- French Agence Nationale de la Recherche (ANR) under Contract SurMott [NT-09-618999]
- Spanish Ministerio de Economia y Competitividad [MAT2014-59966-R]
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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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