Toronto physicists spot hidden eight pole magnetism using chiral phonons

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Physicists at the University of Toronto have found signatures of octupolar magnetism, Quantum Zeitgeist reports. This is a hidden kind of magnetic order with an eight pole arrangement, rather than the familiar north and south poles of a normal magnet. Standard magnetic probes struggle to detect it at all. The work is published in Physical Review Letters

The detection method is the clever part. The team shone rotating light on a crystalline material, which made its atoms vibrate. Those vibrations, called chiral phonons, have a handedness, like a left or right screw. Their optical signature revealed the hidden magnetic state underneath

The researchers are Arun Paramekanti, Swati Chaudhary, lead author Rory Sutcliffe and Kathleen Hart. Paramekanti said they identified new signatures of a hidden type of magnetic state that cannot be detected using ordinary probes. Hart said the work offers a new optical probe for hidden magnetic orders. Chaudhary described it as a new way of identifying and studying these states

There is a possible practical payoff in the longer term. If atomic vibrations can be used to control this kind of magnetism, it might be useful for memory elements that can be read and written. That is still speculative, but it shows how basic physics can point towards future technology. Hidden orders have puzzled physicists for decades

This is one of those quieter quantum materials stories that rarely makes headlines but matters a lot. Understanding exotic magnetic states feeds into quantum materials, spintronics and possibly future quantum devices. It is also a lovely example of creative experimental thinking. Using light to make atoms dance, then reading the dance, is a beautiful idea

Do you enjoy the more fundamental quantum physics stories as much as the computing ones? And could hidden magnetic orders lead to new kinds of memory?

U Of Toronto Team Spots Quantum Magnetism With Eight Poles, Not Twoquantumzeitgeist.com