Journal
REPORTS ON PROGRESS IN PHYSICS
Volume 77, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0034-4885/77/3/034401
Keywords
Fermi gases; polarons; ultracold fermions; quantum mixtures; itinerant ferromagnetism
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Funding
- ERCAdGQUAGATUA
- EU IP SIQS
- MICINN Project TOQATA [FIS2008-00784]
- Fundacio Cellex
- Lise Meitner programme of the Austrian FWF
- Carlsberg Foundation
- ESF POLATOM network
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In this review, we discuss the properties of a few impurity atoms immersed in a gas of ultracold fermions-the so-called Fermi polaron problem. On one hand, this many-body system is appealing because it can be described almost exactly with simple diagrammatic and/or variational theoretical approaches. On the other, it provides a quantitatively reliable insight into the phase diagram of strongly interacting population-imbalanced quantum mixtures. In particular, we show that the polaron problem can be applied to the study of itinerant ferromagnetism, a long-standing problem in quantum mechanics.
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