Speaker
Description
Recently, quantum simulation with ultracold atoms has become a powerful tool for exploring many-body physics. In particular, impurity atoms immersed in quantum media such as degenerate Fermi gases and Bose–Einstein condensates, lead to the formation of Fermi and Bose polarons. Beyond single-polaron properties, polaron-polaron interactions have been actively investigated and experimentally observed in both ultracold atom systems and semiconductors. Recent theoretical studies have further shown that the two polarons interact not only via real-valued potentials, but also acquire imaginary components originating from the open-quantum-system nature of the impurity-medium coupling. In this work, we investigate the effects of complex interactions between two polarons and demonstrate that the complex potential leads to the emergence of localized states and exceptional points, characteristic of non-Hermitian physics. Furthermore, we obtain analytical solutions that describe both localized and delocalized states, providing new insights into non-Hermitian physics in quantum impurity systems.