TY - GEN
T1 - Strongly interacting Fermi gases
AU - Zwerger, W.
N1 - Publisher Copyright:
© Società Italiana di Fisica.
PY - 2016
Y1 - 2016
N2 - The experimental realization of stable, ultracold Fermi gases near a Feshbach resonance allows to study gases with attractive interactions of essentially arbitrary strength. They extend the classic paradigm of BCS into a regime which has never been accessible before. We review the theoretical concepts which have been developed in this context, including the Tan relations and the notion of fixed points at zero density, which are at the origin of universality. We discuss in detail the universal thermodynamics of the unitary Fermi gas which allows a fit free comparison between theory and experiment for this strongly interacting system. In addition, we address the consequences of scale invariance at infinite scattering length and the subtle violation of scale invariance in two dimensions. Finally we discuss the fermionic excitation spectrum accessible in momentum-resolved RF-spectroscopy and the origin of universal lower bounds for the shear viscosity and the spin diffusion constant.
AB - The experimental realization of stable, ultracold Fermi gases near a Feshbach resonance allows to study gases with attractive interactions of essentially arbitrary strength. They extend the classic paradigm of BCS into a regime which has never been accessible before. We review the theoretical concepts which have been developed in this context, including the Tan relations and the notion of fixed points at zero density, which are at the origin of universality. We discuss in detail the universal thermodynamics of the unitary Fermi gas which allows a fit free comparison between theory and experiment for this strongly interacting system. In addition, we address the consequences of scale invariance at infinite scattering length and the subtle violation of scale invariance in two dimensions. Finally we discuss the fermionic excitation spectrum accessible in momentum-resolved RF-spectroscopy and the origin of universal lower bounds for the shear viscosity and the spin diffusion constant.
UR - http://www.scopus.com/inward/record.url?scp=84988928682&partnerID=8YFLogxK
U2 - 10.3254/978-1-61499-694-1-63
DO - 10.3254/978-1-61499-694-1-63
M3 - Conference contribution
AN - SCOPUS:84988928682
T3 - Proceedings of the International School of Physics "Enrico Fermi"
SP - 63
EP - 141
BT - Proceedings of the International School of Physics "Enrico Fermi"
A2 - Stringari, Sandro
A2 - Inguscio, Massimo
A2 - Ketterle, Wolfgang
A2 - Roati, Giacomo
PB - IOS Press
T2 - International School of Physics "Enrico Fermi" on Quantum Matter at Ultralow Temperatures 2014
Y2 - 7 July 2014 through 15 July 2014
ER -