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Sb-terminated InAs(001)-(2×4) and (2×8) studied using scanning tunneling microscopy and ab initio density functional theory

Published online by Cambridge University Press:  21 March 2011

William Barvosa-Carter ,
Frank Grosse ,
James H. G. Owen  and
Jennifer J. Zinck
William Barvosa-Carter
Affiliation:
HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu CA 90265
Frank Grosse
Affiliation:
HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu CA 90265 UCLA Department of Mathematics, Los Angeles, CA
James H. G. Owen
Affiliation:
HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu CA 90265 UCLA Department of Mathematics, Los Angeles, CA
Jennifer J. Zinck
Affiliation:
HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu CA 90265
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Abstract

We have studied the structure of MBE-grown InAs(001)-(2×4) surfaces exposed to low Sb2 fluxes by scanning tunneling microscopy (STM) and ab initio density functional theory (DFT). Experimentally, we observe an Sb-terminated α2(2×4) phase over a wide range of temperatures (400–510 °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 (2×8) 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 (1×3) phase found at typical Sb2 fluxes used during heterostructure growth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 692: Symposium H – Progress in Semiconductor Materials for Optoelectronic Applications , 2001 , H8.4.1
Copyright
Copyright © Materials Research Society 2002

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References

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