Effect of Steps on Structural Phase Transitions of Si(111) 7×7 Surfaces
The effect of steps on the structural phase transition for the Si(111) 7×7 structure dimer-adatom-stacking fault (DAS) structure is investigated using a cell model. This model describes the state of the Si(111) surface in units of 7×7 triangular halves. In the previous work, the subject of which was...
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| Published in | Japanese Journal of Applied Physics Vol. 39; no. 7S; p. 4307 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.07.2000
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| Online Access | Get full text |
| ISSN | 0021-4922 1347-4065 |
| DOI | 10.1143/JJAP.39.4307 |
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| Summary: | The effect of steps on the structural phase transition for the Si(111)
7×7 structure dimer-adatom-stacking fault (DAS) structure is investigated
using a cell model. This model describes the state of the Si(111) surface in units of
7×7 triangular halves. In the previous work, the subject of which was an
infinite terrace, the result calculated for the temperature dependence of the DAS order
parameter exhibited much larger hysteresis than in the experiments, although the main
features of the phase transition were consistent with experiments. The presence of
steps is expected to suppress hysteresis. Calculations for the temperature dependence
of the order parameter are performed using a Monte Carlo simulation in the presence of
steps. By assuming reasonable values of the formation energy of the DAS cell at the
step edges and the intervals between the steps, the calculated result agrees with the
experimental results in terms of hysteresis. |
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| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.39.4307 |