Fermi Polaron in Atom-Ion Hybrid Systems

Area of Science:

• Quantum simulation
• Condensed matter physics
• Quantum information science

Background:

• Atom-ion hybrid systems offer a tunable platform for quantum simulation.
• Polaron physics is crucial for understanding charge carriers in quantum materials.
• Ionic Fermi polarons, charged impurities in Fermi baths, are key to exploring many-body phenomena.

Purpose of the Study:

• Investigate the properties of ionic Fermi polarons at zero temperature.
• Characterize their energy spectrum, effective mass, and structural behavior.
• Compare findings with theoretical predictions and explore polaron-molecule transitions.

Main Methods:

• Utilize quantum Monte Carlo techniques for high-fidelity simulations.
• Analyze the behavior of a charged impurity within a polarized Fermi bath.
• Examine system properties under varying coupling regimes.

Main Results:

• Computed the energy spectrum, residue, and effective mass of the ionic Fermi polaron.
• Observed significant deviations from field-theory predictions in the strong coupling regime.
• Identified large density inhomogeneities around the impurity.
• Discovered a smooth polaron-molecule transition, distinct from the neutral polaron case.

Conclusions:

• Atom-ion systems provide valuable insights into polaron physics in quantum materials.
• Observed phenomena have implications for understanding Fermi exciton polarons in semiconductors.
• The study advances quantum simulation capabilities and informs the development of quantum technologies.