A mobile ion in a Fermi sea
arXiv:2110.15901 · doi:10.1103/PhysRevA.105.023309
Abstract
The remarkable single particle control of individual ions combined with the versatility of ultracold atomic gases makes hybrid ion-atom system an exciting new platform for quantum simulation of few- and many-body quantum physics. Here, we study theoretically the properties of a mobile ion immersed in a quantum degenerate gas of fermionic atoms. Using an effective low-energy atom-ion interaction together with a well established approach that includes exactly two-body correlations, we calculate the full spectral response of the ion and demonstrate the existence of several quasiparticle branches, which are charged analogues of the Fermi polaron observed in neutral atomic gases. Due to the long-range nature of the atom-ion interaction, these ionic Fermi polarons have several properties distinct from their neutral counterparts such as the simultaneous presence of several stable states and smooth transitions from repulsive to attractive polarons with increasing interaction strength. Surprisingly, the residue of the ionic polaron is shown to increase with the Fermi density for fixed interaction strength, which is in marked contrast to the neutral polaron. The properties of the ionic polaron approach that of the neutral polaron only in the low density limit where the average interparticle spacing is larger than the characteristic length of the atom-ion interaction. We finally analyse the effects of the Fermi gas on the molecular ions, which are bound atom-dimer states.
arXiv commentManuscript: 5 pages, 4 figures. Supplemental: 1 page
References in corpus (49)
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
- Metastability and Coherence of Repulsive Polarons in a Strongly Interacting Fermi Mixture
- Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
- Attractive and repulsive Fermi polarons in two dimensions
- Bose polarons in the strongly interacting regime
- Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
- A trapped single ion inside a Bose-Einstein condensate
- Ultrafast many-body interferometry of impurities coupled to a Fermi sea
- Three-body problem in Fermi gases with short-range interparticle interaction
- Three-body recombination of ultra-cold atoms to a weakly bound level
- Repulsive Fermi polarons in a resonant mixture of ultracold Li atoms
- Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
- Three-body recombination at large scattering lengths in an ultracold atomic gas
- Cold hybrid ion-atom systems
- Observation of Cold Collisions between Trapped Ions and Trapped Atoms
- Three-body recombination in Bose gases with large scattering length
- Bose polarons near quantum criticality
- Polaron to molecule transition in a strongly imbalanced Fermi gas
- Normal state of highly polarized Fermi gases: Full many-body treatment
- Mesoscopic molecular ions in Bose-Einstein condensates
- Bipolarons in a Bose-Einstein Condensate
- Controlling chemical reactions of a single particle
- Non-equilibrium quantum dynamics and formation of the Bose polaron
- A single ion as a three-body reaction center in an ultracold atomic gas
- Interacting Polaron-Polaritons
- Analyzing a Bose polaron across resonant interactions
- Ground state of a tightly bound composite dimer immersed in a Fermi Sea
- Observation of Feshbach resonances between a single ion and ultracold atoms
- Analytical theory of the dressed bound state in highly polarized Fermi gases
- Buffer gas cooling of a trapped ion to the quantum regime
- Static properties of positive ions in atomic Bose-Einstein condensates
- Energy scaling of cold atom-atom-ion three-body recombination
- An ionic impurity in a Bose-Einstein condensate at sub-microkelvin temperatures
- Landau Effective Interaction between Quasiparticles in a Bose-Einstein Condensate
- Universal properties in ultracold ion-atom interactions
- Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture
- Optical Traps for sympathetic Cooling of Ions with ultracold neutral Atoms
- Ionic polaron in a Bose-Einstein condensate
- Life and death of a cold BaRb molecule inside an ultracold cloud of Rb atoms
- Unraveling the Structure of Ultracold Mesoscopic Molecular Ions
- Transport of a single cold ion immersed in a Bose-Einstein condensate
- Description of ion motion in a Paul trap immersed in a cold atomic gas
- Charged polarons and molecules in a Bose-Einstein Condensate
- Attractive and repulsive exciton-polariton interactions mediated by an electron gas
- A pulsed ion microscope to probe quantum gases
- Cold chemistry: a few-body perspective on impurity physics of a single ion in an ultracold bath
- Inelastic collision dynamics of a single cold ion immersed in a Bose-Einstein condensate
- Dynamics of a trapped ion in a quantum gas: effects of particle statistics