Revealing spontaneous symmetry breaking in continuous time crystals

• URL: http://arxiv.org/abs/2407.07697v1
• Date: Wed, 10 Jul 2024 14:27:06 GMT
• Title: Revealing spontaneous symmetry breaking in continuous time crystals
• Authors: Yuanjiang Tang, Chenyang Wang, Bei Liu, Jin Peng, Chao Liang, Yaohua Li, Xian Zhao, Cuicui Lu, Shuang Zhang, Yong-Chun Liu,
• Abstract summary: Spontaneous symmetry breaking leads to a novel state of matter named continuous time crystal (CTC) We propose and experimentally realize two types of CTCs based on distinct mechanisms: manifold topology and near-chaotic motion. Our work provides general recipes for the realization of CTCs, and paves the way for exploring CTCs in various systems.
• Score: 17.62738825431278
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spontaneous symmetry breaking plays a pivotal role in physics ranging from the emergence of elementary particles to the phase transitions of matter. The spontaneous breaking of continuous time translation symmetry leads to a novel state of matter named continuous time crystal (CTC). It exhibits periodic oscillation without the need for periodic driving, and the relative phases for repetitively realized oscillations are random. However, the mechanism behind the spontaneous symmetry breaking in CTCs, particularly the random phases, remains elusive. Here we propose and experimentally realize two types of CTCs based on distinct mechanisms: manifold topology and near-chaotic motion. We observe both types of CTCs in thermal atomic ensembles by artificially synthesizing spin-spin nonlinear interactions through a measurement-feedback scheme. Our work provides general recipes for the realization of CTCs, and paves the way for exploring CTCs in various systems.

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