Polarons, dressed molecules and itinerant ferromagnetism in ultracold Fermi gases

Year: 2014

Authors: Massignan P., Zaccanti M., Bruun G. M.

Autors Affiliation: ICFO Inst Ciencies Foton, E-08860 Barcelona, Spain; Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; INO CNR, I-50019 Sesto Fiorentino, Italy; Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

Abstract: 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.


Volume: 77 (3)      Pages from: 034401  to: 034401

More Information: P M acknowledges funding from ERCAdGQUAGATUA, EU IP SIQS, MICINN Project TOQATA (FIS2008-00784) and Fundacio Cellex. M Z was partially supported by the Lise Meitner programme of the Austrian FWF. G M B acknowledges support from the Carlsberg Foundation. Finally, we wish to thank the ESF POLATOM network for financial support.
KeyWords: Fermi gases; itinerant ferromagnetism; polarons; quantum mixtures; ultracold fermions; interacting fermions; Feshbach resonances; repulsive polarons; optical lattices; body problem; 1 dimension; atoms; quantum; state; scattering
DOI: 10.1088/0034-4885/77/3/034401

Citations: 322
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