Observation of Coherent Multiorbital Polarons in a Two-Dimensional Fermi Gas
Creators
-
1.
California Institute of Technology
Abstract
We report on the experimental observation of multiorbital polarons in a two-dimensional Fermi gas of ¹⁷³Yb atoms formed by mobile impurities in the metastable ³𝑃₀ orbital and a Fermi sea in the ground-state ¹𝑆₀ orbital. We spectroscopically probe the energies of attractive and repulsive polarons close to an orbital Feshbach resonance and characterize their coherence by measuring the quasiparticle residue. For all probed interaction parameters, the repulsive polaron is a long-lived quasiparticle with a decay rate more than 2 orders of magnitude below its energy. We formulate a many-body theory, which accurately treats the interorbital interactions in two dimensions and agrees well with the experimental results. Our work paves the way for the investigation of many-body physics in multiorbital ultracold Fermi gases.
Copyright and License
© 2019 American Physical Society.
Acknowledgement
We acknowledge the valuable and helpful discussions with Francesco Scazza and Richard Schmidt, and we thank Vudtiwat Ngampruetikorn for providing his 2D polaron calculation from Ref. [35]. We also thank Giulio Pasqualetti for building the repump laser system. This work was supported by the European Research Council through the synergy grant UQUAM and by the European Union’s Horizon 2020 funding. N. D. O. acknowledges funding from the International Max Planck Research School for Quantum Science and Technology. J. L. and M. M. P. acknowledge financial support from the Australian Research Council via Discovery Project No. DP160102739 and via the ARC Centre of Excellence in Future Low-Energy Electronics Technologies (CE170100039). J. L. is additionally supported by the Australian Research Council through Future Fellowship FT160100244FP7.
Data Availability
Files
PhysRevLett.122.193604.pdf
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Additional details
Identifiers
- ISSN
- 1079-7114
Funding
- European Research Council
- 319278
- Max Planck Society
- Australian Research Council
- FT160100244
- Australian Research Council
- DP160102739