Anisotropic and non-additive interactions of a Rydberg impurity in a quantum bath

• URL: http://arxiv.org/abs/2510.01497v1
• Date: Wed, 01 Oct 2025 22:15:45 GMT
• Title: Anisotropic and non-additive interactions of a Rydberg impurity in a quantum bath
• Authors: Aileen A. T. Durst, Seth T. Rittenhouse, H. R. Sadeghpour, Matthew T. Eiles,
• Abstract summary: We focus on a Rydberg atom immersed in a Bose-Einstein condensate, where the internal-state degeneracy of the Rydberg impurity gives rise to configuration-dependent non-additive potentials.<n>This approach captures the anisotropy and non-additivity characteristic of a Rydberg impurity immersed in a quantum bath, and provides broad applicability to a host of quantum impurity problems beyond the Fr"ohlich paradigm.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a framework for treating anisotropic and non-additive impurity-bath interactions - features that are ubiquitous in realistic quantum impurity problems, but are often neglected in conventional approaches relying on additive, spherically symmetric pseudopotentials. To illustrate this, we focus on a Rydberg atom immersed in a Bose-Einstein condensate, where the internal-state degeneracy of the Rydberg impurity gives rise to configuration-dependent non-additive potentials. With increasing interaction strength, anisotropy-induced partial-wave mixing generates distinct polaron and molaron resonances, allowing for radially and angularly excited bound states to become accessible. This approach captures the anisotropy and non-additivity characteristic of a Rydberg impurity immersed in a quantum bath, and provides broad applicability to a host of quantum impurity problems beyond the Fr\"ohlich paradigm.

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