Journal
EPL
Volume 98, Issue 3, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/98/30005
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Funding
- European Community
- EPSRC [EP/H00369X/1]
- Engineering and Physical Sciences Research Council [EP/H00369X/1] Funding Source: researchfish
- EPSRC [EP/H00369X/1] Funding Source: UKRI
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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. Copyright (C) EPLA, 2012
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