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Switchable topological polar states in epitaxial BaTiO3 nanoislands on silicon
Switchable topological polar states in epitaxial BaTiO3 nanoislands on silicon
An intriguing feature of nanoscale ferroelectric materials is the emergence of topological polar textures, characterized by complex and stable polarization configurations. Manipulating these textures with external stimuli, such as electric fields, offers potential for advanced nanoelectronics. However, challenges remain, including reliable creation and control of these textures on silicon and with lead-free compounds.
Here we demonstrate epitaxial BaTiO3 nanoislands on silicon with stable center-down polarization domains that can be reversibly switched to center-up domains using an electric field.
Sm-doped Pb(Mg1/3Nb2/3)O3–PbTiO3 bulk materials have revealed outstanding ferroelectric and piezoelectric properties due to enhanced local structural heterogeneity. Here, by employing epitaxial thin films, we demonstrate that the Sm-doping enhances the energy storage, piezoelectric, electrocaloric and pyroelectric properties. By using scanning transmission electron microscopy and phase-field modeling, found that these giant properties arise from the increased local structural heterogeneity and strong local electric fields along spontaneous polarization directions facilitating nucleation of slush-like polar structure.
Journal of the American Chemical Society, 146 (47), 32595 (2024)
Here we propose using the ferroelectric logic unit comprising multiple ferroelectric nanodots disposed between two electrodes and coated by the dielectric material, providing topologically configurable non-binary logic into a gate stack of the field-effect transistor as an analog-like device with resistive states. By controlling the charge of the gate, we demonstrate the various routes of the topological switchings between different polarization configurations in ferroelectric nanodots.
Here we focus on insights into the topological origin of the chirality in the nanostructured ferroelectrics, bringing new controllable functionalities. We pay special attention to novel developments enabling tunability and manipulating the chiroptical response and enantioselectivity, leading to new applications in nano-optoelectronics, plasmonics, pharmaceutics, and biomedical industries.
Here we study stable vortex-like textures of polarization in the nanocylinders of ferroelectric PbTiO3, arising due to the competition of the elastic and electrostatic interactions. We demonstrate that the orientation of the vortex core with respect to the cylinder axis is tuned by the geometrical parameters and temperature of the system.
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