Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-04-07
Phys.Rev.A83:063620,2011
Physics
Condensed Matter
Quantum Gases
15 pages, 13 figures; v2: version published in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.83.063620
A light impurity in a Fermi sea undergoes a transition from a polaron to a molecule for increasing interaction. We develop a new method to compute the spectral functions of the polaron and molecule in a unified framework based on the functional renormalization group with full self-energy feedback. We discuss the energy spectra and decay widths of the attractive and repulsive polaron branches as well as the molecular bound state and confirm the scaling of the excited state decay rate near the transition. The quasi-particle weight of the polaron shifts from the attractive to the repulsive branch across the transition, while the molecular bound state has a very small residue characteristic for a composite particle. We propose an experimental procedure to measure the repulsive branch in a Li6 Fermi gas using rf-spectroscopy and calculate the corresponding spectra.
Enss Tilman
Schmidt Richard
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