For a selenium-treated GaAs (001) surface followed by heat treatment at ∼530°C, we have observed using field ion scanning tunneling microscopy ordered arrays with regular intervals of 4×periodicity in the [1̄10] direction (1.6 nm) to line up in the  direction. These ordered arrays are in good agreement with the 4×1 structure previously observed by other methods. In a closer view, the 4×structure was found to be formed by closely placed double rows.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)