Journal
PHYSICAL REVIEW APPLIED
Volume 15, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.034063
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Funding
- European Unions Horizon 2020 programme for Research and Innovation [732894]
- German Federal Ministry of Education and Research through the European QuantERA [13N14777]
- Deutsche Forschungsgemeinschaft via the Collaborative Research Center [SFB 1432]
- Baden-Wurttemberg Foundation [QT-6 SPOC]
- Deutsche Forschungsgemeinschaft [WE 4721/11]
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The research revealed that the tensile stress in string resonators increases by approximately 50% for shorter resonators, regardless of the material used in fabrication. A simple elastic model was established to describe the observed length dependence of the tensile stress, and it accurately matches the experimental data. This presents a new perspective for stress engineering the mechanical quality factor of nanomechanical string resonators.
We investigate the tensile stress in freely suspended nanomechanical string resonators, and observe a material-independent dependence on the resonator length. We compare strongly stressed string resonators fabricated from four different material systems based on amorphous silicon nitride, crystalline silicon carbide as well as crystalline indium gallium phosphide. The tensile stress is found to increase by approximately 50% for shorter resonators. We establish a simple elastic model to describe the observed length dependence of the tensile stress. The model accurately describes our experimental data. This opens a perspective for stress engineering the mechanical quality factor of nanomechanical string resonators.
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