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Coherent x-ray diffraction from quantum dots

VARTANYANTS, I. A ; ROBINSON, I. K ; ONKEN, J. D ; PFEIFER, M. A ; WILLIAMS, G. J ; PFEIFFER, F ; METZGER, H ; ZHONG, Z ; BAUER, G

Physical review. B, Condensed matter and materials physics, 2005-06, Vol.71 (24), p.245302.1-245302.9, Article 245302 [Periódico revisado por pares]

Ridge, NY: American Physical Society

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Título:
Coherent x-ray diffraction from quantum dots
Autor: VARTANYANTS, I. A ; ROBINSON, I. K ; ONKEN, J. D ; PFEIFER, M. A ; WILLIAMS, G. J ; PFEIFFER, F ; METZGER, H ; ZHONG, Z ; BAUER, G
Assuntos: 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
É parte de: Physical review. B, Condensed matter and materials physics, 2005-06, Vol.71 (24), p.245302.1-245302.9, Article 245302
Descrição: 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.
Editor: Ridge, NY: American Physical Society
Idioma: Inglês

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Coherent x-ray diffraction from quantum dots

VARTANYANTS, I. A ; ROBINSON, I. K ; ONKEN, J. D ; PFEIFER, M. A ; WILLIAMS, G. J ; PFEIFFER, F ; METZGER, H ; ZHONG, Z ; BAUER, G

Ridge, NY: American Physical Society

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