The Joint Condensed Matter Seminar (JCMS) series is organised by KTH Royal Insitute of Technology, Nordita, and Stockholm University.
On Monday, September 22th, 2025 from 11.00 am to 12.00 we will host a seminar by Anish Acharya from Tata Institute of Fundamental Research
Manipulating Phases in Many-Body Interacting Systems using Subsystem Resetting
Stabilising unstable phases in many-body interacting systems is a longstanding challenge. In this work, we use subsystem resetting as a new, minimally invasive protocol to control such systems. The idea is simple: only a chosen subpart of the system is stochastically reset to a target state, while the rest part evolves freely, and we ask what happens to some order parameter at long times. This avoids global interventions and fine-tuning of couplings. We show that subsystem resetting can reproduce the full phase diagram of the original model and, crucially, allows systematic manipulation of phase-transition points by adjusting the reset frequency, subsystem size, and reset configuration. We demonstrate this across a wide class of models, namely, equilibrium and non-equilibrium, mean-field and finite-dimensional, with and without quenched disorder, highlighting the ubiquity of the results. These results open up a versatile framework for stabilising or suppressing targeted phases in complex interacting systems.
[1] A. Acharya, R. Majumder, S. Gupta, Phys. Rev. Lett. 135,127103 (2025).