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‘Time crystal’ presents mystery for physicists

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 crystal
Physicists looked for a signature of a discrete time crystal in a crystal of monoammonium phosphate. (Credit: Yale)

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 US Department of Defense recently announced a program to fund more research into time crystal systems.

The researchers describe their findings 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.

“We decided to try searching for the DTC signature ourselves,” says Sean Barrett, a physics professor at Yale University and principal investigator on the two new studies. “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 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 explains, 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. “Our crystal measurements looked quite striking right off the bat,” Barrett says. “Our work suggests that the signature of a DTC could be found, in principle, by looking in a children’s crystal growing kit.”

2D crystals may enable future super-thin electronics

Another unexpected thing happened, as well. “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,” says graduate student Robert Blum, a coauthor of the studies. “This spurred us to try a time crystal ‘echo,’ which revealed the hidden coherence, or quantum order, within the system,” adds Rovny, also a graduate student and lead author of the studies.

Barrett notes 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,” Barrett says.

The National Science Foundation supported the research.

Source: Yale University

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