A Quantitative Evaluation of the Dimer Concentration during the (2x1)-(1x1) Phase Transition on Ge(001)

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6 Citations (Scopus)

Abstract

We propose a new quantitative model of the high-temperature (2 × 1)-(1 × 1) phase transition on Ge(0 0 1). We demonstrate that the transition is driven by an entropy facilitated breakup of dimers. A full quantitative description of the reversible variation of the dimer concentration requires incorporation of vibration entropy, not only of the topmost atoms, but also of those in two layers beneath. The main ingredients of our new model include the dimer formation energy and the difference in vibration entropy between the reconstructed (2 × 1) and the bulk-terminated (1 × 1)-phase. This entropy difference amounts to about 1.4 meV/K and the obtained dimer formation energy of 1.5 ± 0.2 eV is in good agreement with calculated values.
Original languageUndefined
Pages (from-to)L23-L28
Number of pages6
JournalSurface science
Volume574
Issue number2-3
DOIs
Publication statusPublished - 2005

Keywords

  • IR-73069
  • METIS-227097

Cite this

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title = "A Quantitative Evaluation of the Dimer Concentration during the (2x1)-(1x1) Phase Transition on Ge(001)",
abstract = "We propose a new quantitative model of the high-temperature (2 × 1)-(1 × 1) phase transition on Ge(0 0 1). We demonstrate that the transition is driven by an entropy facilitated breakup of dimers. A full quantitative description of the reversible variation of the dimer concentration requires incorporation of vibration entropy, not only of the topmost atoms, but also of those in two layers beneath. The main ingredients of our new model include the dimer formation energy and the difference in vibration entropy between the reconstructed (2 × 1) and the bulk-terminated (1 × 1)-phase. This entropy difference amounts to about 1.4 meV/K and the obtained dimer formation energy of 1.5 ± 0.2 eV is in good agreement with calculated values.",
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author = "{van Vroonhoven}, E. and Zandvliet, {Henricus J.W.} and Bene Poelsema",
year = "2005",
doi = "10.1016/j.susc.2004.11.009",
language = "Undefined",
volume = "574",
pages = "L23--L28",
journal = "Surface science",
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publisher = "Elsevier",
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A Quantitative Evaluation of the Dimer Concentration during the (2x1)-(1x1) Phase Transition on Ge(001). / van Vroonhoven, E.; Zandvliet, Henricus J.W.; Poelsema, Bene.

In: Surface science, Vol. 574, No. 2-3, 2005, p. L23-L28.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - A Quantitative Evaluation of the Dimer Concentration during the (2x1)-(1x1) Phase Transition on Ge(001)

AU - van Vroonhoven, E.

AU - Zandvliet, Henricus J.W.

AU - Poelsema, Bene

PY - 2005

Y1 - 2005

N2 - We propose a new quantitative model of the high-temperature (2 × 1)-(1 × 1) phase transition on Ge(0 0 1). We demonstrate that the transition is driven by an entropy facilitated breakup of dimers. A full quantitative description of the reversible variation of the dimer concentration requires incorporation of vibration entropy, not only of the topmost atoms, but also of those in two layers beneath. The main ingredients of our new model include the dimer formation energy and the difference in vibration entropy between the reconstructed (2 × 1) and the bulk-terminated (1 × 1)-phase. This entropy difference amounts to about 1.4 meV/K and the obtained dimer formation energy of 1.5 ± 0.2 eV is in good agreement with calculated values.

AB - We propose a new quantitative model of the high-temperature (2 × 1)-(1 × 1) phase transition on Ge(0 0 1). We demonstrate that the transition is driven by an entropy facilitated breakup of dimers. A full quantitative description of the reversible variation of the dimer concentration requires incorporation of vibration entropy, not only of the topmost atoms, but also of those in two layers beneath. The main ingredients of our new model include the dimer formation energy and the difference in vibration entropy between the reconstructed (2 × 1) and the bulk-terminated (1 × 1)-phase. This entropy difference amounts to about 1.4 meV/K and the obtained dimer formation energy of 1.5 ± 0.2 eV is in good agreement with calculated values.

KW - IR-73069

KW - METIS-227097

U2 - 10.1016/j.susc.2004.11.009

DO - 10.1016/j.susc.2004.11.009

M3 - Article

VL - 574

SP - L23-L28

JO - Surface science

JF - Surface science

SN - 0039-6028

IS - 2-3

ER -