| Issue |
Europhys. Lett.
Volume 57, Number 4, February 2002
|
|
|---|---|---|
| Page(s) | 499 - 505 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00489-5 | |
| Published online | 01 September 2002 | |
Grazing-incidence diffraction anomalous fine structure
of 
self-assembled quantum wires
1
Laboratoire de Cristallographie, CNRS - B.P. 166, 38042
Grenoble Cedex 09, France
2
Departamento de Física de la Materia Condensada, Instituto
de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza -
c. Pedro Cerbuna 12, 50009 Zaragoza, Spain
3
Instituto de Microelectrónica de Madrid, CSIC
c. Isaac Newton 8, 28760 Tres Cantos, Spain
Received:
29
May
2001
Accepted:
20
November
2001
We have studied nanostructured samples of InAs/InP(001) by means of Grazing Incidence Diffraction Anomalous Fine Structure. The samples, grown by molecular beam epitaxy, show a periodic corrugation on the surface giving rise to an array of self-assembled quantum wires after deposition of 2.5 monolayers of InAs. We measured the (440) and (420) GIDAFS spectra, at the As K-edge, at incidence and outgoing angles close to the substrate's critical angle. We analysed the anomalous diffraction lineshapes vs. the energy, as well as the oscillatory part of the signal in the extended region above the edge and obtained, for the first time, information about composition and strain inside the quantum wires and close to the interface. Our results suggest possible interfaces.
PACS: 61.10.-i – X-ray diffraction and scattering / 61.10.Ht – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc / 68.65.-k – Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties
© EDP Sciences, 2002
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