Probing polaron clouds by Rydberg atom spectroscopy
arXiv:2306.03627 · doi:10.1103/PhysRevLett.132.053401
Abstract
In recent years, Rydberg excitations in atomic quantum gases have become a successful platform to explore quantum impurity problems. A single impurity immersed in a Fermi gas leads to the formation of a polaron, a quasiparticle consisting of the impurity being dressed by the surrounding medium. With a radius of about the Fermi wavelength, the density profile of a polaron cannot be explored using in-situ optical imaging techniques. In this work, we propose a new experimental measurement technique that enables the in-situ imaging of the polaron cloud in ultracold quantum gases. The impurity atom is first excited to an interacting state which induces the formation of a polaron cloud. This is followed by the excitation of the impurity atom to a Rydberg state. Due to the mesoscopic interaction range of Rydberg excitations, which can be tuned by the principal numbers of the Rydberg state, atoms extracted from the polaron cloud form dimers with the impurity. By performing first principle calculations of the absorption spectrum based on a functional determinant approach, we show how the occupation of the dimer state can be directly observed in spectroscopy experiments and can be mapped onto the density profile of the gas particles, hence providing a direct, real-time, and in-situ measure of the polaron cloud.
15 pages, 12 figures
References in corpus (13)
- Many-Body Physics with Ultracold Gases
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Attractive and repulsive Fermi polarons in two dimensions
- Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
- Repulsive Fermi polarons in a resonant mixture of ultracold Li atoms
- An experimental and theoretical guide to strongly interacting Rydberg gases
- Time dependent impurity in ultracold fermions: orthogonality catastrophe and beyond
- Full counting statistics for noninteracting fermions: Exact results and the Levitov-Lesovik formula
- Ground state of a tightly bound composite dimer immersed in a Fermi Sea
- Spin-Imbalanced Quasi-Two-Dimensional Fermi Gases
- Observation of coherent multiorbital polarons in a two-dimensional Fermi gas
- Polarons and Molecules in a Two-Dimensional Fermi Gas
- Exact quasiparticle properties of a heavy polaron in BCS Fermi superfluids