Control of dynamical phase transitions and non-ergodic relaxation via spinor phases
Abstract
Utilizing ultracold spinor gases as large-scale, many-body quantum simulation platforms, we establish a toolbox for the precise control, characterization, and detection of nonequilibrium dynamics via internal spinor phases. We develop a method to extract the phase evolution from the observed spin population dynamics, allowing us to define an order parameter that sharply identifies dynamical phase transitions over a wide range of conditions. This work also demonstrates a technique for inferring spin-dependent interactions from a single experimental time trace, in contrast to the standard approach that requires mapping a cross section of the phase diagram, with immediate applications to systems experiencing complex time-dependent interactions. Additionally, we demonstrate experimental access to and control over non-ergodic relaxation dynamics, where states of similar energy in the (nominally) thermal region of the energy spectrum retain a dependence on the initial state, via the manipulation of spinor phases, enabling the study of non-ergodic thermalization dynamics connected to quantum scarring.
Keywords
Cite
@article{arxiv.2511.03720,
title = {Control of dynamical phase transitions and non-ergodic relaxation via spinor phases},
author = {J. O. Austin-Harris and P. Sigdel and C. Binegar and S. E. Begg and T. Bilitewski and Y. Liu},
journal= {arXiv preprint arXiv:2511.03720},
year = {2026}
}