Repulsive polarons in two-dimensional Fermi gases

Details Repulsive polarons in two-dimensional Fermi gases Repulsive polarons in two-dimensional Fermi gases

2011-10-28

arxiv.org/abs/1110.6415v2

Physics

Condensed Matter

Quantum Gases

6 pages, 3 figures

Scientific paper

We consider a single spin-down impurity atom interacting via an attractive, short-range potential with a spin-up Fermi sea in two dimensions (2D). Similarly to 3D, we show how the impurity can form a metastable state (the "repulsive polaron") with energy greater than that of the non-interacting impurity. Moreover, we find that the repulsive polaron can acquire a finite momentum for sufficiently weak attractive interactions. Even though the energy of the repulsive polaron can become sizeable, we argue that saturated ferromagnetism is unfavorable in 2D because of the polaron's finite lifetime and small quasiparticle weight.

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