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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.09175 |
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| _version_ | 1866912190628364288 |
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| author | Hadjimichael, Yiannis Brandt, Oliver Merdon, Christian Manganelli, Costanza Farrell, Patricio |
| author_facet | Hadjimichael, Yiannis Brandt, Oliver Merdon, Christian Manganelli, Costanza Farrell, Patricio |
| contents | We present a finite-strain model that is capable of describing the large deformations in bent nanowire heterostructures. The model incorporates a nonlinear strain formulation derived from the first Piola-Kirchhoff stress tensor, coupled with an energy functional that effectively captures the lattice-mismatch-induced strain field. We use the finite element method to solve the resulting partial differential equations and extract cross-sectional maps of the full strain tensor for both zincblende and wurtzite nanowires with lattice-mismatched core and one-sided stressor shell. In either case, we show that the bending is essentially exclusively determined by $\varepsilon_{zz}$. However, the distinct difference in shear strain has important consequences with regard to both the mechanical deformation and the existence of transverse piezoelectric fields in the nanowires. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09175 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strain distribution in zincblende and wurtzite GaAs nanowires bent by a one-sided (In, Al)As stressor shell: consequences for torsion, chirality, and piezoelectricity Hadjimichael, Yiannis Brandt, Oliver Merdon, Christian Manganelli, Costanza Farrell, Patricio Mesoscale and Nanoscale Physics Applied Physics 74B20, 62.23.Hj, 68.65.-k, 62.20.-x, 77.84.-s, 77.65.Ly We present a finite-strain model that is capable of describing the large deformations in bent nanowire heterostructures. The model incorporates a nonlinear strain formulation derived from the first Piola-Kirchhoff stress tensor, coupled with an energy functional that effectively captures the lattice-mismatch-induced strain field. We use the finite element method to solve the resulting partial differential equations and extract cross-sectional maps of the full strain tensor for both zincblende and wurtzite nanowires with lattice-mismatched core and one-sided stressor shell. In either case, we show that the bending is essentially exclusively determined by $\varepsilon_{zz}$. However, the distinct difference in shear strain has important consequences with regard to both the mechanical deformation and the existence of transverse piezoelectric fields in the nanowires. |
| title | Strain distribution in zincblende and wurtzite GaAs nanowires bent by a one-sided (In, Al)As stressor shell: consequences for torsion, chirality, and piezoelectricity |
| topic | Mesoscale and Nanoscale Physics Applied Physics 74B20, 62.23.Hj, 68.65.-k, 62.20.-x, 77.84.-s, 77.65.Ly |
| url | https://arxiv.org/abs/2501.09175 |