Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"strain-tuning"”.
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Raman spectroscopy: from ferroelastic domain identification to strain tuning
… mechanically or piezoeletrically applied strain. Methods for quantitative determination of strain by Raman spectroscopy are proposed for some materials such as BiFeO3 or strained Si. Raman spectroscopy was also used for understanding temperature induced phase transitions or orbital …
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Strain-tuning of periodic optical devices : tunable gratings and photonic crystals
… In this thesis, specific implementations of strain-tunability in two photonic devices will be discussed: the fundamental diffractive grating element, and a photonic band gap microcavity waveguide. For the first part, we demonstrate high-resolution analog tunability in microscale diffractive …
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Structure, magnetism and multiferroicity in self-assembled oxide nanocomposites
… a vertical columnar morphology, with epitaxially strained interfaces perpendicular to the substrate. Through appropriate materials selection and strain tuning, the interfaces in these vertically aligned nanocomposites exhibit exciting properties such as high conduction at interfaces, enhanced …
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Semiconductor-generated entangled photons for hybrid quantum networks
… distribution at rubidium memory transitions. Strain tuning is applied via piezoelectric actuators to allow for reversible fine-tuning of the emission frequency. In a next step, active feedback is employed to stabilize the frequency of single photons emitted by two separate quantum dots to an …
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Optical and core-level X-ray spectroscopy of correlated two-dimensional materials
… probes in combination with appropriate external tuning parameters (e.g. strain, pressure, ligand substitution, layer number) for revealing the origin of correlated phases in low-dimensional vdW materials. We first investigate the triangular lattice antiferromagnet NiI₂. Frustrated exchange …
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Exploring Quantum Phenomena in 2D Materials: From Valley Topology and Exciton Selection Rules to Tuning Magnetic Correlations
… magnetic anisotropy, and shows that biaxial strain tunes antiferromagnetic, paramagnetic, and ferromagnetic behavior. Part I, Application A: Interband index and valley topology. We introduce a novel gauge-invariant, quantized interband index in two-dimensional (2D) multiband systems. It …