Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-05-17
Phys. Rev. A 84, 033607 (2011)
Physics
Condensed Matter
Quantum Gases
5 pages, 3 figures
Scientific paper
We investigate a single impurity interacting with a free two-dimensional atomic Fermi gas. The interaction between the impurity and the gas is characterized by an arbitrary attractive short-range potential, which, in two dimensions, always admits a two-particle bound state. We provide analytical expressions for the energy and the effective mass of the dressed impurity by including the two-body bound state, which is crucial for strong interactions, in the integral equation for the effective interaction. Using the same method we give also the results for the polaron parameters in one and three dimensions finding a pretty good agreement with previous known results. Thus our relations can be used as a simple way to estimate the polaron parameters once the two-body bound state of the interaction potential is known.
Klawunn Michael
Recati Alessio
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