Measuring Friedel pairs in nanomembranes of GaAs (001)

  • Raul O. Freitas
  • Christoph F. Deneke
  • Ângelo Malachias
  • Gaspar Darin
  • Sérgio L. Morelhão
Research Paper
  • 125 Downloads
Part of the following topical collections:
  1. Nanostructured Materials 2012. Special Issue Editors: Juan Manuel Rojo, Vasileios Koutsos

Abstract

Friedel pairs are susceptible to symmetry breaking in crystals. Under resonant scattering conditions, non-centrosymmetric crystals can give rise to pairs of hkl and \(\bar{h}\bar{k}\bar{l}\) reflections with different diffracted intensities, which are quantified as an anomalous signal of the structure. In bulk crystals, the shift in the anomalous signal through an absorption edge can be measured with good accuracy regardless the crystalline quality of the sample, leading to experimental values in agreement with theoretical ones. With the advance of nanotechnology and synchrotron sources, it has been possible to produce free-standing nanomembranes of semiconductor crystals, opening the opportunity of checking the measurability of anomalous signal in nanoscale materials. In this study, we describe a successful procedure to measure the anomalous signal in nanomembranes of GaAs (001) 15-nm thick with synchrotron radiation. Different membrane processing methods and diffraction geometries were tested, and major sources of instrumental inaccuracy were identified. Relevances of this type of measurements in nanotechnology as well as in basic science are discussed.

Keywords

Bijvoet pairs Free-standing nanomembranes Single crystals Synchrotron X-ray diffraction Atomic resonance 

Notes

Acknowledgments

We acknowledge the funding agency for research of the São Paulo State FAPESP (Proc. No. 2012/15858-8), the National agency CNPq (Proc. No. 304247/2009-0) and support of the Brazilian synchrotron. Thanks are also due to M.H. de Oliveira Piazetta and A.L. Gobbi from LMF-LNNano for lithography in microfabrication of the membranes.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Raul O. Freitas
    • 1
  • Christoph F. Deneke
    • 2
    • 3
  • Ângelo Malachias
    • 4
  • Gaspar Darin
    • 5
  • Sérgio L. Morelhão
    • 5
  1. 1.Brazilian Synchrotron Light Laboratory (LNLS)CampinasBrazil
  2. 2.Brazilian Nanotechnology National Laboratory (LNNano)CampinasBrazil
  3. 3.IFW DresdenDresdenGermany
  4. 4.Departamento de FísicaUniversidade Federal de Minas GeraisBelo HorizonteBrazil
  5. 5.Instituto de FísicaUniversidade de São PauloSão PauloBrazil

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