Nearly perfect 3D ordering in IV-VI quantum dot superlattices with ABCABC... vertical stacking sequence
| Authors | |
|---|---|
| Year of publication | 2000 |
| Type | Article in Periodical |
| Magazine / Source | Physica E |
| MU Faculty or unit | |
| Citation | |
| Web | http://www.sci.muni.cz/~mikulik/Publications.html#SpringStanglPHMMWBSKS_PhE_2000 |
| Field | Solid matter physics and magnetism |
| Keywords | quantum dots; molecular beam epitaxy; superlattices; self organization; PbSe; X-ray diffraction |
| Description | Self-organization of PbSe islands in epitaxial PbSe/Pb1-xEuxTe superlattices is shown to result in a spontaneous three-dimensional ordering of the PbSe dots in a trigonal lattice with a fee-like ABCABC vertical stacking sequence. From X-ray diffraction reciprocal space maps, the interlayer correlation direction of the PbSe dots is found to be inclined by 40 degrees with respect to the [111] surface normal. Peak profile measurements in the reciprocal space maps yield a coherence length of the ordered regions of 300 +/- 100 nm in the lateral, and of 530 +/- 50 nm in the vertical direction. This corresponds to ordered regions that contain as many as 250 PbSe dots. |
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