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The conductivity of the crystal is increased by 400 times

23.11.2013

Scientists accidentally discovered that the electrical conductivity of a crystal increases 400 times if it is exposed to light - using this effect, physicists can significantly increase the capacity and speed of storage devices; the results of the study were published in the journal Physical Review Letters.

Marianne Tarun of the University of Washington and her colleagues conducted a study on strontium titanate. As they worked, they noticed that its electrical conductivity suddenly increased. At first they could not understand what was the matter, and only then found out that the electrical conductivity increased when the crystals were exposed to light.

Then the scientists conducted an experiment: they left the crystals under bright light for 10 minutes, and then removed them into the dark. It turned out that the effect of increasing electrical conductivity lasts for several days - the researchers explain this by the fact that light releases electrons in the material, allowing them to carry more electrical current.

This ability, the so-called residual photoconductivity, has nothing to do with superconductivity - the complete absence of electrical resistance, which physicists can achieve only at temperatures close to absolute zero - Tarun and her colleagues found their effect under normal conditions.

"The appearance of this effect at room temperature opens up new possibilities. In standard computer memory, information is accumulated on the surface of chips or hard drives, and in devices using residual photoconductivity, information can be stored in the entire crystal," said Matthew McCluskey, co-author of the study, whose words are quoted in a message from the university.

This approach has been called holographic memory and is considered a potential replacement for high-capacity data technologies. So, if now on magnetic and optical media data is recorded in one or two layers, then in holographic memory they will be recorded over the entire volume of the device, and the speed of writing and reading information will increase.

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