Coherent x-ray diffraction from quantum dots

Coherent x-ray diffraction is a new experimental method for studying perfect and imperfect crystals. Instead of incoherent averaging, a coherent sum of amplitudes produces a coherent diffraction pattern originating from the real space arrangement of the sample. We applied this method for studying qu...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-06, Vol.71 (24), p.245302.1-245302.9, Article 245302
Main Authors: VARTANYANTS, I. A, ROBINSON, I. K, ONKEN, J. D, PFEIFER, M. A, WILLIAMS, G. J, PFEIFFER, F, METZGER, H, ZHONG, Z, BAUER, G
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: structure, mechanical and thermal properties
CRYSTALS
Exact sciences and technology
GERMANIUM ALLOYS
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
OPTICS
PERIODICITY
Physics
QUANTUM DOTS
SCATTERING AMPLITUDES
SEMICONDUCTOR MATERIALS
SILICON ALLOYS
SUBSTRATES
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
X RADIATION
X-RAY DIFFRACTION
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Summary:Coherent x-ray diffraction is a new experimental method for studying perfect and imperfect crystals. Instead of incoherent averaging, a coherent sum of amplitudes produces a coherent diffraction pattern originating from the real space arrangement of the sample. We applied this method for studying quantum dot samples that were specially fabricated GeSi islands of nanometer size and in a regular array embedded into a Si substrate. A coherent beam was focused by special Kirkpatric-Baez optics to a micrometer size. In the experiment it was observed that such a microfocused coherent beam produced coherent diffraction pattern with Bragg spots and broad diffuse maxima. The diffuse peak breaks up into a fine speckle pattern. The grazing incidence diffraction pattern has a typical shape resulting from the periodic array of identical islands. We used this diffraction pattern to reconstruct the average shape of the islands using a model independent approach.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.71.245302