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Domain boundaries in the GaAs(001)-2$$times$$4 surface

Takahashi, Masamitsu; Yoneda, Yasuhiro   ; Yamamoto, Naomasa*; Mizuki, Junichiro

The $$alpha$$, $$beta$$ and $$gamma$$ phases of the GaAs(001)-2$$times$$4 surface have been investigated by ${it in situ}$ surface X-ray diffraction in an As flux and at temperatures ranging from 480$$^circ$$C to 610$$^circ$$C. It has been found that the fractional-order peaks originating from the fourfold symmetry show shift in the [110] direction as well as significant broadening of the peaks in the $$alpha$$ and $$gamma$$ phases. The direction of the peak shift is characteristic in each phase. This behavior is explained by the formation of the antiphase domain boundaries. The atomic structure of the domain boundaries is discussed.

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Category:Materials Science, Multidisciplinary

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