Researchers have created the fastest man-made rotor in the world, which they believe will help them in the study of quantum mechanics. At more than 60 billion revolutions per minute, this machine is more than 100,000 times faster than a high-speed dental drill. The findings were published in the journal Physical Review Letters.
Tongcang Li, an assistant professor of physics and astronomy and electrical and computer engineering at Purdue University, said:
“This study has many applications, including material science.
“We can study the extreme conditions different materials can survive in.”
Li’s team synthesized a tiny dumbbell from silica and levitated it in a high vacuum using a laser. The laser can work in a straight line or in a circle — when it’s linear, the dumbbell vibrates, and when it’s circular, the dumbbell spins.
A nanodumbbell levitated by an optical tweezer in a vacuum can vibrate or spin, depending on the polarization of the incoming laser. (Image: Tongcang Li via Purdue University)
A spinning dumbbell functions as a rotor, and a vibrating dumbbell functions like an instrument for measuring tiny forces and torques, known as a torsion balance. These devices were used to discover things like the gravitational constant and density of Earth, but Li hopes that as they become more advanced, they’ll be able to study things like quantum mechanics and the properties of a vacuum.
Watch the video to see how it happens below:
“People say that there is nothing in [a] vacuum, but in physics, we know it’s not really empty,” Li said.
“There are a lot of virtual particles which may stay for a short time and then disappear. We want to figure out what’s really going on there, and that’s why we want to make the most sensitive torsion balance.”
By observing this tiny dumbbell spin faster than anything before it, Li’s team may also be able to learn things about vacuum friction and gravity. Understanding these mechanisms is an essential goal for the modern generation of physics, Li said.
Researchers from Purdue, Peking University, Tsinghua University, and the Collaborative Innovation Center of Quantum Matter in Beijing also contributed to this work. The first author of this work is Jonghoon Ahn, a graduate student in Li’s research group. Li’s research was funded by the National Science Foundation and Office of Naval Research.
Provided by: Purdue University [Note: Materials may be edited for content and length.]
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