Reconstructions of GaAs(1¯ 1¯ 1¯) surfaces observed by scanning tunneling microscopy
- 23 July 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 65 (4), 452-455
- https://doi.org/10.1103/physrevlett.65.452
Abstract
We present scanning tunneling microscopy images of the As-rich (2×2) and the Ga-rich (√19 × √19 ) reconstructions of the GaAs(1¯ 1¯ 1¯) surface produced in situ by molecular-beam epitaxy. From the experimental results and total-energy calculations we show that the (2×2) surface consists of As adatom trimers bonded to the underlying surface. The (√19 × √19 ) unit cell is dominated by a two-layer hexagonal ring.Keywords
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