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1
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Photon-induced switching and tunneling phenomena in a YBCO thin film junction

100%
Yang X., Beckwith A., Miller J.
Open Physics
|
2005
|
vol. 3
|
issue 1
24-34
EN
In the persistent photoconductivity (PPC) phenomenon, illumination of a YBa2Cu3O6.5 thin film junction with a 1mW He−Ne laser leads to the decrease of the critical voltage (similar to the threshold voltage). The decrease of the critical voltage was reversed by illumination with incandescent light. The critical voltage across the junction was experimentally decreased and increased by alternating illumination between He−Ne laser and incandescent light. We also observed visible quenching of the photo-induced state using a 5mW He−Ne laser. Finally, the threshold behavior of the junction was destroyed by illuminating it with incandescent light.
2
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Observation of magnetic field-induced contraction of fission yeast cells using optical projection microscopy

100%
Yang X., Beckwith A., Miller J., Wood L.
Open Physics
|
2004
|
vol. 2
|
issue 4
636-644
EN
The charges in live cells interact with or produce electric fields, which results in enormous dielectric responses, flexoelectricity, and related phenomena. Here we report on a contraction of Schizosaccharomyces pombe (fission yeast) cells induced by magnetic fields, as observed using a phase-sensitive projection imaging technique. Unlike electric fields, magnetic fields only act on moving charges. The observed behavior is therefore quite remarkable, and may result from a contractile Lorentz force acting on diamagnetic screening currents. This would indicate extremely high intracellular charge mobilities. Besides, we observed a large electro-optic response from fission yeast cells.
3
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Pulsed laser deposition of a PBN:65 morphotropic phase boundary thin film with large electrostriction

100%
Yang X., Beckwith A., Strikovski M.
Open Physics
|
2005
|
vol. 3
|
issue 2
178-185
EN
We deposited epitaxial thin films of Morphotropic Phase Boundary (MPB) Pb0.65Ba0.35Nb2O6 (PBN:65) on MgO substrates using pulsed laser deposition. Afterwards, a novel transmission optical experiment was developed to measure the electric field-induced bending angle of the thin film sample using a divergent incident light. From which the electric field-induced strain was obtained, and it was used to calculate the electrostrictive constant of the PBN thin film. The result is 0.000875 μm2/V2, and it is consistent with what we measured in the reflection experiment
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