Quasiparticle Lifetime of the Repulsive Fermi Polaron

Year: 2020

Authors: Adlon, HS., Liu WE., Scazza F., Zaccanti M., Oppong, ND., Foelling, S., Parish MM., Levinsen J.

Autors Affiliation: Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia; Monash Univ, ARC Ctr Excellence Future Low Energy Elect Techno, Clayton, Vic 3800, Australia; CNR, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy; Ludwig Maximilians Univ Munchen, Schellingstr 4, D-80799 Munich, Germany; Max Planck Inst Quantum Opt, Hans Kopfertnann Str 1, D-85748 Garching, Germany; Munich Ctr Quantum Sci & Technol MCQST, Schellingstr 4, D-80799 Munich, Germany.

Abstract: We investigate the metastable repulsive branch of a mobile impurity coupled to a degenerate Fermi gas via short-range interactions. We show that the quasiparticle lifetime of this repulsive Fermi polaron can be experimentally probed by driving Rabi oscillations between weakly and strongly interacting impurity states. Using a time-dependent variational approach, we find that we can accurately model the impurity Rabi oscillations that were recently measured for repulsive Fermi polarons in both two and three dimensions. Crucially, our theoretical description does not include relaxation processes to the lower-lying attractive branch. Thus, the theory-experiment agreement demonstrates that the quasiparticle lifetime is dominated by many-body dephasing within the upper repulsive branch rather than by relaxation from the upper branch itself. Our findings shed light on recent experimental observations of persistent repulsive correlations, and have important consequences for the nature and stability of the strongly repulsive Fermi gas

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 125 (13)      Pages from: 133401-1  to: 133401-18

More Information: We are grateful to J. Cole, P. Massignan, A. Recati, and M. Zonnios for useful discussions. J. L., W. E. L., and M. M. P. acknowledge support from the Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies (Grant No. CE170100039). J. L. is also supported through the Australian Research Council Future Fellowship FT160100244. N. D. O. acknowledges funding from the Max-Planck-Gesellschaft. M. Z. was supported by the ERC through Grant No. 637738 PoLiChroM. F. S. acknowledges funding from EU H2020 programme under the Marie Sklodowska-Curie GA Grant No. 705269 and Fondazione Cassa di Risparmio di Firenze Project No. QuSim2D 2016.0770.
KeyWords: FESHBACH RESONANCE, FERMI GASES, POLARON PHYSICS, QUASI-PARTICLE
DOI: 10.1103/PhysRevLett.125.133401

Citations: 32
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