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arXiv · 2311.09303

Chirality-induced emergent spin-orbit coupling in topological atomic lattices

Jonah S. Peter·Stefan Ostermann·Susanne F. Yelin
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Abstract

Spin-orbit coupling is of fundamental interest in both quantum optical and condensed matter systems alike. In this work, we show that optically induced electronic excitations in lattices of V-type atoms exhibit an emergent spin-orbit coupling when the geometry is chiral. This spin-orbit coupling arises naturally from the electric dipole interaction between the atomic sites and leads to a nontrivial topology for the lattice band structure. Using a general quantum optical model, we determine analytically the conditions that give rise to spin-orbit coupling and characterize the behavior under various symmetry transformations. We demonstrate that chirality-induced spin-orbit coupling can result from either the chirality of the underlying lattice geometry or the combination of an achiral lattice with a suitably chosen external quantization axis. We then discuss how these results are influenced by dissipation, which breaks time-reversal symmetry and illuminates the distinction between true and false chirality. Our results demonstrate that chiral atom arrays are a robust platform for realizing spin-orbit-coupled topological states of matter.

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Jonah S. Peter, Stefan Ostermann, Susanne F. Yelin. 2023-11-15. Chirality-induced emergent spin-orbit coupling in topological atomic lattices. https://doi.org/10.1103/physreva.109.043525

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