English

Phase diagram of a dual-species Rydberg atom ladder

Quantum Gases 2026-04-29 v1 Quantum Physics

Abstract

Dual-species Rydberg atom arrays extend single-species platforms by introducing competing interaction scales and enhanced quantum fluctuations, enabling phenomena beyond homogeneous settings. In this work, we study the ground-state phase diagram of a one-dimensional dual-species Rydberg atom ladder using large-scale density-matrix renormalization group calculations. We identify disordered phases, multiple ordered phases with Z2\mathbb{Z}_2, Z3\mathbb{Z}_3, and Z4\mathbb{Z}_4 symmetry, as well as floating phases characterized by incommensurate wave vectors and algebraically decaying correlations. Importantly, we observe a smooth crossover between distinct Z2\mathbb{Z}_2-ordered regimes, reflecting a reorganization of low-energy degrees of freedom rather than a true phase transition, which is absent in single-species Rydberg arrays. We further uncover a multi-critical point at the boundary between the Z2Z2\mathbb{Z}_2 \otimes \mathbb{Z}_2 and Z3Z3\mathbb{Z}_3 \otimes \mathbb{Z}_3 ordered phases, where Ising, chiral, and first-order transition lines intersect. Our results demonstrate that dual-species Rydberg atom arrays provide a unique platform for realizing crossover physics and multi-critical behavior inaccessible in single-species architectures.

Keywords

Cite

@article{arxiv.2604.24889,
  title  = {Phase diagram of a dual-species Rydberg atom ladder},
  author = {Lei-Yi-Nan Liu and Shi-Rong Peng and Ze-Yuan Huang and Xing-Man Wei and Yun-Han Zou and Su Yi and Jian Cui},
  journal= {arXiv preprint arXiv:2604.24889},
  year   = {2026}
}

Comments

12 pages, 9 figures