Self-consistent effective field theory to nonuniversal Lee-Huang-Yang term in quantum droplets
Phys. Rev. A 114, 013320 – Published 31 July, 2026
DOI: https://doi.org/10.1103/jw77-p9rj
Abstract
Quantum droplets (QDs) in weakly interacting ultracold quantum gases are typically characterized by mean-field theories incorporating Lee-Huang-Yang (LHY) quantum fluctuations under simplified zero-range interaction assumptions. However, bridging these models to broader physical regimes like superfluid helium requires precise understanding of short-range interatomic interactions. Here, we investigate how finite-range interactions—next-order corrections to zero-range potentials—significantly alter QD mechanics. Using a consistent effective theory, we derive an analytical equation of state (EOS) for three-dimensional bosonic mixtures under finite-range interactions at zero temperature. Leveraging the Hubbard-Stratonovich transformation, we demonstrate that interspecies attraction facilitates bosonic pairing across components characterized by the nonperturbative parameter of , leading to nonuniversal LHY terms that encode short-range interaction details while recovering previous universal QD EOS in the zero-range limit. Extending superfluid hydrodynamic equations for two-component systems, we predict fractional frequency shifts in breathing modes induced by these nonuniversal terms. Experimental observation of these shifts would reveal critical insights into QD dynamics and interatomic potential characteristics.
