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The discovery of a new type of semiconductor brings high-speed computers closer to reality

Physicists at the University of San Diego have successfully created integrated circuits with particles called excitons that operate at a temperature that can be achieved with commercial liquid nitrogen refrigeration and not near absolute zero

Two members of the Computing Laboratory at UCSD assemble the experimental exciton computer
Two members of the Computing Laboratory at UCSD assemble the experimental exciton computer

Physicists at the University of San Diego have successfully created integrated circuits with particles called excitons, which operate at temperatures achievable in commercial refrigeration. This discovery will enable the development of a new type of extremely fast computers based on exit and noms. The discovery is published in the online issue of the journal Nature Photonics.

So far, scientists have been able to build circuits based on excitons only at a temperature of 1.5 degrees Kelvin (minus 271 degrees Celsius), that is, almost at absolute zero - the average temperature in deep space, which can only be achieved on Earth in special research laboratories. Now the scientists say that they have succeeded in building an integrated circuit that operates at a temperature of 125 degrees Kelvin (minus 148 degrees Celsius), still cold, but this degree of heat can be reached by cooling with liquid nitrogen, the price of a liter of which is about the price of a liter of fuel.
"Our goal is to create efficient devices based on exit and nm that will operate at room temperature, says Leonid Butov, professor of physics at the University of California, San Diego, who headed the research team. "Our team has only recently demonstrated the principle of operating a transistor using excitons, and research continues."
Excitons are pairs of negatively charged electrons and positively charged "holes" that can be created by light in semiconductors such as gallium arsenide. When an electron and a hole merge the exciton decays and releases its energy like a flash of light.
The fact that an exciton can be converted to light makes the exciton devices faster and more efficient than the conventional electronic devices with the optical interface, which use electrons for calculation and must be converted to light in order to use communication devices and pass through optical fibers.
Our transistors process the signals using exit diodes, which, like electrons, can be controlled by means of an electric voltage, but unlike the electrons, they become photons as the output of the circuit," Botov said. The direct coupling of photons allows us to link the calculation and communication systems.

to the notice of the researchers

4 תגובות

  1. Excitons are not particles but quasi-particles as their name (in English excitons) yes they are, excitations of the ground state in a semiconductor. As excitations they live a finite time and decay (as mentioned they are not particles) the low temperature prevents them from decaying to the ground state as a result of a phonon collision which is also a quasi-particle that is an excitation of the crystal.

    A particle quasi differs from a particle in that there is no conservation law for it.

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