Sb-Terminated InAs(OO1)-(2x4) and (2x8) Studied Using Scanning Tunneling Microscopy and ab initio Density Functional Theory
Abstract
We have studied the structure of MBE-grown InAs(001)-(2 x 4) surfaces exposed to low Sb2 fluxes by scanning tunneling microscopy (STM) and ab initio density functional theory (DFT). Experimentally, we observe an Sb-terminated alpha 2(2 x 4) phase over a wide range of temperatures (400 - 510 deg C) for low Sb2 flux (< 0.1 ML/s), whereas temperature and As2 flux must be carefully controlled to achieve the same As-terminated surface structure. At lower temperatures, we observe indications of an Sb-terminated (2 x 8) symmetry surface phase, and we report briefly on its proposed structure and stability, as well as its possible role in subsequent formation of the Sb-terminated (1 x 3) phase found at typical Sb2 fluxes used during heterostructure growth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2002
- Accession Number
- ADP012636
Entities
People
- Frank Grosse
- James H. Owen
- Jennifer J. Zinck
- William Barvosa-carter
Organizations
- HRL Laboratories