(2×1)-(1×1) Phase Transition on Ge(001): Dimer Breakup and Surface Roughening

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Vroonhoven, Esther van and Zandvliet, Harold J.W. and Poelsema, Bene (2003) (2×1)-(1×1) Phase Transition on Ge(001): Dimer Breakup and Surface Roughening. Physical Review Letters, 91 (11). p. 116102. ISSN 0031-9007

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Abstract:Using low energy electron microscopy, we have investigated the (2×1)-(1×1) phase transition occurring above 925 K on Ge(001). Dimer breakup has been identified as the physical origin of this transition. A quantitative description of the dimer concentration during the transition involves configuration entropy of random monomers within the dimer matrix. The dimer formation energy amounts to 1.2±0.3  eV. Dimer breakup promotes reversible surface disorder by step proliferation and irreversible surface roughening above 1130 K.
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Copyright:© 2003 American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/61189
Official URL:http://dx.doi.org/10.1103/PhysRevLett.91.116102
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