In this section
@article{Etrych:2025:10.1103/PhysRevX.15.021070,
author = {Etrych, J and Martirosyan, G and Cao, A and Ho, CJ and Hadzibabic, Z and Eigen, C},
doi = {10.1103/PhysRevX.15.021070},
journal = {Physical Review X},
title = {Universal Quantum Dynamics of Bose Polarons},
url = {http://dx.doi.org/10.1103/PhysRevX.15.021070},
volume = {15},
year = {2025}
}
TY - JOUR
AB - Predicting the emergent properties of impurities immersed in a quantum bath is a fundamental challenge that can defy quasiparticle treatments. Here, we measure the spectral properties and real-time dynamics of mobile impurities injected into a weakly interacting homogeneous Bose-Einstein condensate, using two broad Feshbach resonances to tune both the impurity-bath and intrabath interactions. For attractive impurity-bath interactions, the impurity spectrum features a single branch, which away from the resonance corresponds to a well-defined attractive polaron; near the resonance, we observe dramatic broadening of this branch, suggesting a breakdown of the quasiparticle picture. For repulsive impurity-bath interactions, the spectrum features two branches: the attractive branch that is dominated by excitations with energy close to that of the Feshbach dimer, but has a many-body character, and the repulsive polaron branch. Our measurements show that the behavior of impurities in weakly interacting baths is remarkably universal, controlled only by the bath density and a single dimensionless interaction parameter.
AU - Etrych,J
AU - Martirosyan,G
AU - Cao,A
AU - Ho,CJ
AU - Hadzibabic,Z
AU - Eigen,C
DO - 10.1103/PhysRevX.15.021070
PY - 2025///
TI - Universal Quantum Dynamics of Bose Polarons
T2 - Physical Review X
UR - http://dx.doi.org/10.1103/PhysRevX.15.021070
VL - 15
ER -