Scanning tunneling microscopy and first-principles theory of the Sn/GaAs(110) surface
- 15 November 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (14) , 10044-10047
- https://doi.org/10.1103/physrevb.40.10044
Abstract
Scanning tunneling microscopy of Sn overlayers on the GaAs(110) surface shows patterns with local order of nominal (3×3) periodicity and an absence of long-range order. Using first-principles calculations, we show that these observations can be explained in terms of a double-layer structure which consists of a complete (1×1) Sn layer covered by Sn adatoms. This structure results from a subtle balance between electronic energy and lattice strain. Spectroscopic studies indicate that this Sn overlayer exhibits a narrow gap (Keywords
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