Quantum dot optomechanics in suspended nanophononic strings
| Autor: | Benjamin Mayer, Saimon Filipe Covre da Silva, Armando Rastelli, Xueyong Yuan, Maximilian M. Sonner, Anja Vogele, Hubert J. Krenner, Emeline D. S. Nysten, Matthias Weiß |
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| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Physics::Optics FOS: Physical sciences 02 engineering and technology Applied Physics (physics.app-ph) 01 natural sciences Molecular physics String (physics) symbols.namesake Lamb waves 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ddc:530 Electrical and Electronic Engineering Rayleigh scattering 010306 general physics Mathematical Physics Optomechanics Physics Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Surface acoustic wave Statistical and Nonlinear Physics Acoustic wave Physics - Applied Physics 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Computational Theory and Mathematics Quantum dot symbols 0210 nano-technology Mechanical wave Quantum Physics (quant-ph) Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.1908.08804 |
| Popis: | The optomechanical coupling of quantum dots and flexural mechanical modes is studied in suspended nanophononic strings. The investigated devices are designed and monolithically fabricated on an (Al)GaAs heterostructure. Radio frequency elastic waves with frequencies ranging between $f$=250 MHz to 400 MHz are generated as Rayleigh surface acoustic waves on the unpatterned substrate and injected as Lamb waves in the nanophononic string. Quantum dots inside the nanophononic string exhibit a 15-fold enhanced optomechanical modulation compared to those dynamically strained by the Rayleigh surface acoustic wave. Detailed finite element simulations of the phononic mode spectrum of the nanophononic string confirm, that the observed modulation arises from valence band deformation potential coupling via shear strain. The corresponding optomechanical coupling parameter is quantified to $0.15 \mathrm{meV nm^{-1}}$. This value exceeds that reported for vibrating nanorods by approximately one order of magnitude at 100 times higher frequencies. Using this value, a derive vertical displacements in the range of 10 nm is deduced from the experimentally observed modulation. The results represent an important step towards the creation of large scale optomechanical circuits interfacing single optically active quantum dots with optical and mechanical waves. Comment: Submitted manuscript |
| Databáze: | OpenAIRE |
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