Quantifying Strain and its Effect on Charge Transport in Ge/Si Core/Shell Nanowires
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2026
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| author | Sivan, Aswathi K. Forrer, Nicolas Shandilya, Aakash Liu, Yang Böhler, Janica Vogel, Alexander Nigro, Arianna Kwon, Pierre Chevalier Efimov, Artemii Golokolenov, Ilya Gadea, Gerard Rurali, Riccardo Baumgartner, Andreas Zumbühl, Dominik M. Zardo, Ilaria |
| author_facet | Sivan, Aswathi K. Forrer, Nicolas Shandilya, Aakash Liu, Yang Böhler, Janica Vogel, Alexander Nigro, Arianna Kwon, Pierre Chevalier Efimov, Artemii Golokolenov, Ilya Gadea, Gerard Rurali, Riccardo Baumgartner, Andreas Zumbühl, Dominik M. Zardo, Ilaria |
| contents | Strain engineering in semiconductor nanostructures offers a promising route to optimize electronic and optical properties for advanced quantum technologies. This study explores the relationship between core and shell thicknesses and strain distribution in Ge/Si core/shell nanowires, targeting their application as hosts for spin qubits. Nanowires were synthesized using an Au-catalyzed chemical vapor deposition technique, achieving control over core and shell dimensions. High-resolution transmission electron microscopy and elemental mapping confirmed structural integrity, while Geometric Phase Analysis and Raman spectroscopy provided quantitative insights into strain variations driven by core and shell dimensions. Furthermore, polarization resolved $μ$-Raman measurements allowed us to quantify the longitudinal and transverse phonon mode splitting as a function of strain in the Ge core. The strain dependent electronic properties were investigated by hole mobility measurements. Finally, we observe a record high hole mobility of 25,500 cm$^2$V$^{-1}$s$^{-1}$, underscoring the potential of these core/shell nanowire structures for the realization of high-fidelity spin qubits. Our findings highlight the critical role of geometry in strain tuning and provide valuable design guidelines for optimizing Ge/Si nanowires in scalable quantum device architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_14546 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantifying Strain and its Effect on Charge Transport in Ge/Si Core/Shell Nanowires Sivan, Aswathi K. Forrer, Nicolas Shandilya, Aakash Liu, Yang Böhler, Janica Vogel, Alexander Nigro, Arianna Kwon, Pierre Chevalier Efimov, Artemii Golokolenov, Ilya Gadea, Gerard Rurali, Riccardo Baumgartner, Andreas Zumbühl, Dominik M. Zardo, Ilaria Mesoscale and Nanoscale Physics Strain engineering in semiconductor nanostructures offers a promising route to optimize electronic and optical properties for advanced quantum technologies. This study explores the relationship between core and shell thicknesses and strain distribution in Ge/Si core/shell nanowires, targeting their application as hosts for spin qubits. Nanowires were synthesized using an Au-catalyzed chemical vapor deposition technique, achieving control over core and shell dimensions. High-resolution transmission electron microscopy and elemental mapping confirmed structural integrity, while Geometric Phase Analysis and Raman spectroscopy provided quantitative insights into strain variations driven by core and shell dimensions. Furthermore, polarization resolved $μ$-Raman measurements allowed us to quantify the longitudinal and transverse phonon mode splitting as a function of strain in the Ge core. The strain dependent electronic properties were investigated by hole mobility measurements. Finally, we observe a record high hole mobility of 25,500 cm$^2$V$^{-1}$s$^{-1}$, underscoring the potential of these core/shell nanowire structures for the realization of high-fidelity spin qubits. Our findings highlight the critical role of geometry in strain tuning and provide valuable design guidelines for optimizing Ge/Si nanowires in scalable quantum device architectures. |
| title | Quantifying Strain and its Effect on Charge Transport in Ge/Si Core/Shell Nanowires |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.14546 |