Abstract
Reversible and bistable terahertz (THz) radiation by sweeping the temperature has been observed in a dipole-type photoswitching device fabricated on magnetoresistive charge-ordered manganite Pr0.7Ca0.3MnO3 thin film. Based on simultaneous measurements of the photocurrent, we show that this THz functionality of Pr0.7Ca0.3MnO3 arises from the instability of metallic patches embedded with a charge-ordered insulating phase, which is created by the illumination of visible light under an electric field at constant temperature, and that it can also be controlled by a subsequent change of temperature.
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