5,380 research outputs found
External uniform electric field removing flexoelectric effect in epitaxial ferroelectric thin films
Using the modified Landau-Ginsburg-Devonshire thermodynamic theory, it is
found that the coupling between stress gradient and polarization, or
flexoelectricity, has significant effect on ferroelectric properties of
epitaxial thin films, such as polarization, free energy profile and hysteresis
loop. However, this effect can be completely eliminated by applying an
optimized external, uniform electric field. The role of such uniform electric
field is shown to be the same as that of an ideal gradient electric field which
can suppress the flexoelectricty effect completely based on the present theory.
Since the uniform electric field is more convenient to apply and control than
gradient electric field, it can be potentially used to remove the flexoelectric
effect induced by stress gradient in epitaxial thin films and enhance the
ferroelectric properties.Comment: 5 pages, 3 figure
Demonstration of Deutsch's Algorithm on a Stable Linear-Optical Quantum Computer
We report an experimental demonstration of quantum Deutsch's algorithm by
using linear-optical system. By employing photon's polarization and spatial
modes, we implement all balanced and constant functions for quantum computer.
The experimental system is very stable and the experimental data are excellent
in accordance with the theoretical results.Comment: 7 pages, 4 figure
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