Abstract
When an impurity is immersed in a Bose-Einstein condensate, impurity-boson interactions are expected to dress the impurity into a quasiparticle, the Bose polaron. We superimpose an ultracold atomic gas of with a much lower density gas of fermionic impurities. Through the use of a Feshbach resonance and radio-frequency spectroscopy, we characterize the energy, spectral width, and lifetime of the resultant polaron on both the attractive and the repulsive branches in the strongly interacting regime. The width of the polaron in the attractive branch is narrow compared to its binding energy, even as the two-body scattering length diverges.
- Received 3 May 2016
DOI:https://doi.org/10.1103/PhysRevLett.117.055301
© 2016 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Bose Polarons that Strongly Interact
Published 28 July 2016
Researchers have used impurities within a Bose-Einstein condensate to simulate polarons—electron-phonon combinations in solid-state systems.
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