Residual strain in free-standing CdTe nanowires overgrown with HgTe
Kessel, Maximilian; Lunczer, Lukas; Tarakina, Nadezda V; Brüne, Christoph; Buhmann, Hartmut; Molenkamp, Laurens W
Journal article, Peer reviewed
Accepted version
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Date
2019Metadata
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- Institutt for fysikk [2652]
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Original version
10.1063/1.5085174Abstract
We investigate the crystal properties of CdTe nanowires overgrown with HgTe. Scanning electron microscopy and scanning transmission electron microscopy confirm that the growth results in a high ensemble uniformity and that the individual heterostructures are single-crystalline, respectively. We use high-resolution X-ray diffraction to investigate strain, caused by the small lattice mismatch between the two materials. We find that both CdTe and HgTe show changes in the lattice constant compared to the respective bulk lattice constants. The measurements reveal a complex strain pattern with signatures of both uniaxial and shear strains present in the overgrown nanowires.