Best evidence yet for existence of anyons

Best evidence yet found for existence of anyons
Quasiparticle braiding experiment. a) Schematic representation of quasiparticle exchange; quasiparticles are represented by red vortices, and trajectories are shown in dashed lines. b) False-color SEM image of interferometer. Credit: arXiv:2006.14115 [cond-mat.mes-hall]

A small team of researchers at Purdue University has found the strongest evidence yet of the existence of abelian anyons. They have written a paper describing experiments they conducted designed to reveal the existence of the quasiparticles and have uploaded it to the arXiv preprint server while they await peer review.

Anyons are neither bosons nor fermions—in fact, they are not elementary particles at all. Instead, they are classified as quasiparticles that exist in two dimensions. They can be observed, theoretically speaking, when they appear as disturbances in two-dimensional sheets of materials. Theoretical physicists have suggested their existence since the late 1970s and they were officially named by Frank Wilczek in the early 1980s. Theory has also suggested that they braid, but in ways differently than bosons or fermions. If a fermion or a boson were dragged around another of its kind, theory suggests, the action would not produce a record of what had occurred. But because anyons alter , they would create such a record. The process involves inserting a phase into the wave function of the particles. In this new effort, the researchers created a device that allowed them to see evidence of such a record.

The device the team created involved moving anyons along a 2-D path; at a given point, the pathway split. One of the paths looped around another which was situated in the center of the device. The other took a direct route before the two paths were reunited. The team then measured the in the device looking for jumps. According to , such jumps would be present as anyons were added and then removed from the device, altering the phase. To be able to record such jumps, the device was built in layers of materials that filtered out random noise. The resulting measurements make the the strongest case to date for the existence of quasiparticles, and in so doing, have strongly bolstered theories that describe both their existence and their behavior. They have also likely brightened the hopes of some researchers who have been looking into the possibility of using anyons to create more robust quantum computers.

More information: Nakamura et al., Direct observation of anyonic braiding statistics at the ν=1/3 fractional quantum Hall state, arXiv:2006.14115 [cond-mat.mes-hall].

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