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On-chip GHz time crystals with semiconductor photonic devices pave way to new physics and optoelectronic applications

On-chip GHz time crystals with semiconductor photonic devices pave way to new physics and optoelectronic applications
Researchers have for the first time observed a time crystal on a microscale semiconductor chip oscillating at a rate of several billion times per second, unveiling exceptionally high non-linear dynamics in the GHz range.

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A recent study has revealed the observation of a time crystal on a microscale semiconductor chip oscillating at a rate of several billion times per second. This discovery has unveiled exceptionally high non-linear dynamics in the GHz range. The results of the experiment, published in Science, establish a firm connection between formerly uncorrelated areas of non-linear exciton-polariton dynamics and coherent optomechanics at GHz frequencies. The research was carried out using a high-quality semiconductor-based sample that acts as a trap for coherent light-matter condensates. The researchers found that the oscillations could be fine-tuned by the laser's optical power, with the possibility to stabilize the free evolution of the frequency by engineered 20-GHz mechanical vibrations of the semiconductor atomic lattice. This discovery holds promise for using time crystals in integrated and microwave photonics, with potential applications in (quantum) conversion between microwave and optical frequencies.

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