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

• URL: http://arxiv.org/abs/2311.09303v2
• Date: Mon, 16 Dec 2024 21:08:40 GMT
• Title: Chirality-induced emergent spin-orbit coupling in topological atomic lattices
• Authors: Jonah S. Peter, Stefan Ostermann, Susanne F. Yelin,
• Abstract summary: We show that optical excitations in lattices of V-type atoms exhibit an emergent spin-orbit coupling when the geometry is chiral. 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.
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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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