Hierarchical time crystals

TL;DR

This paper introduces hierarchical time crystals formed by coupled discrete and continuous time crystals, revealing a novel two-fold symmetry breaking and emergent discrete temporal symmetry, expanding the understanding of non-equilibrium phases of matter.

Contribution

It demonstrates the formation of hierarchical time crystals through coupling discrete and continuous time crystals, showing emergent symmetries and robustness across various parameters.

Findings

Hierarchical time crystals exhibit two-fold temporal symmetry breaking.

Emergent discrete symmetries arise dynamically in coupled systems.

Hierarchical phases are robust across different coupling schemes.

Abstract

Spontaneous symmetry breaking is one of the central organizing principles in physics. Time crystals have emerged as an exotic phase of matter, spontaneously breaking the time translational symmetry, and are mainly categorized as discrete or continuous. While these distinct types of time crystals have been extensively explored as standalone systems, intriguing effects can arise from their mutual interaction. Here, we demonstrate that a time-independent coupled system of discrete and continuous time crystals induces a simultaneous two-fold temporal symmetry breaking, resulting in a hierarchical time crystal phase. Interestingly, one of the subsystems breaks an emergent discrete temporal symmetry that does not exist in the dynamical generator but rather emerges dynamically, leading to a convoluted non-equilibrium phase. We demonstrate that hierarchical time crystals are robust, emerging for fundamentally different coupling schemes and persisting across wide ranges of system parameters.