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Exciton transistor

21.07.2008

US scientists want to directly convert an electrical signal into light.

"In microelectronics, there is one unpleasant contradiction: calculations are carried out using electrons, and signals are transmitted over long distances using photons. A lot of time and energy are spent on the corresponding transformations. We tried to eliminate this contradiction," says Leonid Batov from the University of California at San Francisco. Diego. To do this, they created an exciton transistor.

An exciton is a quasiparticle that consists of an electron and a hole bound together. Such quasiparticles can be created, for example, in gallium arsenide cooled to 40K by shining a laser with a certain wavelength on it. An exciton does not live long and, when decaying, gives up the energy stored in it in the form of a quantum of light.

Physicists led by Batov have learned not only to create excitons, but also to lock them with the help of an electric field in quantum walls. And you can release excitons by changing the voltage on the electrodes of the microcircuit. Thus, the whole device works like a real transistor, where the electrons move or do not move depending on what voltage is applied to the control electrode. Here, they actually control the movement of photons, into which excitons turn, as soon as they leave the quantum wall.

If it is possible to raise the operating temperature of the semiconductor, such a device will find wide application for the rapid exchange of information between computers, as well as between microcircuits, which in this case will have to be connected not by electric wires, but by optical fibers.

<< Back: The computer reads minds 22.07.2008

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