Plate Nº 43 · recorded October 10, 2026
PhysicsReported finding
Simulation Brings Elusive 'Fracton' Particles Closer to Lab Detection
HZB physicists show fractons — nearly immobile quasiparticles that could store quantum information robustly — can survive in a realistic quantum solid model, edging closer to lab detection.
By Elena Vasquez3 min read631 words
In brief
- The study appears in Nature Communications, volume 17, issue 1, published in 2026.
- Fractons are quasiparticles that essentially cannot move on their own — a property proposed for robust quantum information storage.
- The simulations by Professor Johannes Reuther and Dr. Nils Niggemann show fractons can exist in a realistic 2D spin-1 quantum solid model, not only in abstract gauge theories.
- Earlier models failed: too-strong quantum effects made fractons vanish; too-weak effects left them classical.
- Rydberg atom simulators are a proposed platform for the first experimental detection of fractons.
Physicists have shown for the first time that fractons — exotic, nearly immobile quasiparticles — can emerge in a realistic quantum model of a solid, not just in idealized theory. The result, published in Nature Communications in 2026, moves a strange prediction of quantum physics a step closer to experimental detection and, potentially, to unusually robust quantum information storage.
Researchers at the Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), led by Professor Johannes Reuther and Dr. Nils Niggelman, report evidence that the sought-after phase of matter can exist under realistic quantum conditions in a two-dimensional spin-1 model. Their study, co-authored with Meghadeepa Adhikary and Yannik Schaden-Thillmann, appears in Nature Communications, volume 17, issue 1.
What are fractons?
Fractons are quasiparticles — collective excitations that emerge from the behavior of many interacting particles inside a solid, much like phonons, the quasiparticles physicists use to describe vibrations moving through a crystal lattice.
Fractons are far stranger. They appear at the corners of magnetic domain walls — the boundaries separating different arrangements of electron spins in a material. Their defining feature is extreme immobility: a single fracton essentially cannot move on its own. It can only be shifted through interactions with other fractons.
That restriction is exactly what makes them interesting. Because fractons are so hard to move, researchers have proposed they could serve as building blocks for storing quantum information in a way that is far more resistant to disturbance than current approaches.
Where would fractons live?
The leading candidate is a quantum spin liquid — an unusual state of matter in which the magnetic moments of electrons never settle into a fixed arrangement, even when cooled to absolute zero. Instead, the spins keep fluctuating, much like atoms in a liquid keep moving.
Physicists have predicted fractons in several systems, including quantum spin liquids. But until now, those predictions rested on highly generalized mathematical frameworks called rank-2 U(1) gauge theories. No experiment has directly observed fractons in any material.
Why is the new model a breakthrough?
Earlier attempts to build more realistic models hit a serious problem. The simulations by the same research group had to include quantum effects — but when those effects were too strong, the fractons disappeared. When the effects were too weak, fractons survived only as classical particles, without genuine quantum behavior. Neither outcome matched what theorists wanted.
The team solved this by improving how the model represents interactions between the spins. The new numerical simulations show that the fracton phase can exist under realistic quantum conditions in a solid-state system — closing much of the gap between abstract theory and something a lab could actually test.
The team did not work in isolation. "When modeling this complex spin interaction, we benefit from personal exchanges with HZB colleagues in experimental solid-state physics," Johannes Reuther said.
What happens next?
The findings remain theoretical, and the researchers are careful about their scope: the simulations provide evidence that the fracton phase can exist, not a direct detection. The next challenge is to identify or create real physical systems that reproduce the conditions assumed in the model. Only then can scientists test experimentally whether the predicted fractons actually appear.
One promising platform is a Rydberg atom simulator — an experimental device that uses highly excited atoms to mimic the behavior of quantum materials. The authors suggest it could provide a viable route toward finally detecting these elusive quasiparticles.
If that detection succeeds, it would open a path toward testing the proposed application: quantum memory built from particles that, by their very nature, refuse to move.
Reference: Niggemann, N., Adhikary, M., Schaden-Thillmann, Y. & Reuther, J. "Gapless fracton quantum spin liquid and emergent photons in a 2D spin-1 model." Nature Communications 17, 1 (2026). DOI: 10.1038/s41467-026-74797-0.
via dx.doi.org (Original)
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