Researchers in the Department of Theoretical Physics at Tata Institute of Fundamental Research (TIFR), Mumbai, have discovered that instead of manipulating every component or modifying interactions in a many-body system, occasionally resetting just a small fraction can reshape how the entire system behaves, including how it transitions from one phase to another. At the heart of the mechanism is non-equilibrium dynamics.
The work opens pathways to light-touch control in diverse real systems, including:
Neural networks, where timed resetting could suppress pathological neural synchrony (e.g., Parkinson's disease),
Magnetic and quantum materials, potentially stabilizing phases over wider temperature ranges,
Cold atom and ion-trap platforms, where resetting could be experimentally implemented,
Complex interaction networks, where resetting only influential nodes may guide global behavior.
Looking ahead, the researchers are keen to see the idea tested in systems where failures are rare but catastrophic.
More information: Anish Acharya et al, Manipulating Phases in Many-Body Interacting Systems with Subsystem Resetting, Physical Review Letters (2025). DOI: 10.1103/np7q-hxld
Nucleation of crystals, for instance, only requires a single tiny nucleus to cause a large scale phase change. So the idea is familiar in systems close to critical.