Yale physicists find signs of a time crystal

Yale physicists have uncovered hints of a time crystal a form of matter that ticks when exposed to an electromagnetic pulse in the last place they expected a crystal you might find in a child's toy. The discovery means there are now new puzzles to solve, in terms of how time crystals form in the first place. Ordinary crystals such as salt or quartz are examples of three-dimensional, ordered spatial crystals. Their atoms are arranged in a repeating system, something scientists have known for a century.

Time crystals, first identified in 2016, are different. Their atoms spin periodically, first in one direction and then in another, as a pulsating force is used to flip them. That's the ticking. In addition, the ticking in a time crystal is locked at a particular frequency, even when the pulse flips are imperfect.

Scientists say that understanding time crystals may lead to improvements in atomic clocks, gyroscopes, and magnetometers, as well as aid in building potential quantum technologies. The U.S. Department of Defense recently announced a program to fund more research into time crystal systems.

Yale's new findings are described in a pair of studies, one in Physical Review Letters and the other in Physical Review B. The studies represent the second known experiment observing a telltale signature for a discrete time crystal (DTC) in a solid. Previous experiments led to a flurry of media attention in the past year.

Yale physics professor Sean Barrett, principal investigator for the two new studies, we decided to try searching for the DTC signature ourselves. My student Jared Rovny had grown monoammonium phosphate (MAP) crystals for a completely different experiment, so we happened to have one in our lab.

MAP crystals are considered so easy to grow that they are sometimes included in crystal growing kits aimed at youngsters. It would be unusual to find a time crystal signature inside a MAP crystal, Barrett explained, because time crystals were thought to form in crystals with more internal disorder.

The researchers used nuclear magnetic resonance (NMR) to look for a DTC signature and quickly found it. 

Barrett said, our crystal measurements looked quite striking right off the bat. Our work suggests that the signature of a DTC could be found, in principle, by looking in a children's crystal growing kit.

Another unexpected thing happened, as well. 

Yale graduate student Robert Blum, a co-author on the studies said, we realized that just finding the DTC signature didn't necessarily prove that the system had a quantum memory of how it came to be. 

Rovny, also a Yale graduate student and lead author of the studies said, this spurred us to try a time crystal echo, which revealed the hidden coherence, or quantum order, within the system.

Barrett noted that his team's results, combined with previous experiments, present a puzzle for theorists trying to understand how time crystals form. It's too early to tell what the resolution will be for the current theory of discrete time crystals, but people will be working on this question for at least the next few years.

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