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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Anomalous Fast Dynamics of Adsorbate Overlayers near an Incommensurate Structural Transition

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Granato, Enzo [1, 2] ; Ying, S. C. [2] ; Elder, K. R. [3] ; Ala-Nissila, T. [2, 4, 5]
Total Authors: 4
[1] Inst Nacl Pesquisas Espaciais, Lab Associado Sensores & Mat, BR-12245970 Sao Paulo - Brazil
[2] Brown Univ, Dept Phys, Providence, RI 02912 - USA
[3] Oakland Univ, Dept Phys, Rochester, MI 48309 - USA
[4] Aalto Univ, Sch Sci, Dept Appl Phys, FI-00076 Espoo - Finland
[5] Aalto Univ, Sch Sci, COMP Ctr Excellence, FI-00076 Espoo - Finland
Total Affiliations: 5
Document type: Journal article
Source: Physical Review Letters; v. 111, n. 12 SEP 17 2013.
Web of Science Citations: 5

We investigate the dynamics of a compressively strained adsorbed layer on a periodic substrate via a simple two-dimensional model that admits striped and hexagonal incommensurate phases. We show that the mass transport is superfast near the striped-hexagonal phase boundary and in the hexagonal phase. For an initial step profile separating a bare substrate region (or ``hole'') from the rest of a striped incommensurate phase, the superfast domain wall dynamics leads to a bifurcation of the initial step profile into two interfaces or profiles propagating in opposite directions with a hexagonal phase in between. This yields a theoretical understanding of the recent experiments for the Pb/Si(111) system. (AU)

FAPESP's process: 07/08492-9 - Dynamics, topological defects and phase transitions in ordered media
Grantee:Enzo Granato
Support type: Research Projects - Thematic Grants