Anomalous photoinduced current transients in the nematic phase are experimentally observed by illuminating a liquid-crystal sample with a xenon-flash-lamp pulse while applying a dc voltage. The response time is fast, of the order of a microsecond, and independent of the magnitude of the applied voltage. The peak current is independent of the wavelength of the light and displays a critical response near the nematic-isotropic phase-transition temperature. Pyroelectricity in nematic liquid crystals is proposed as the physical origin of the phenomenon.
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Sugimura et al. (1989) studied this question.
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