Strongly Interacting Gas of Two-Electron Fermions at an Orbital Feshbach Resonance

Year: 2015

Authors: Pagano G., Mancini M., Cappellini G., Livi L., Sias C., Catani J., Inguscio M., Fallani L.

Autors Affiliation: Department of Physics and Astronomy, University of Florence, I-50019 Sesto Fiorentino, Italy;
LENS European Laboratory for Nonlinear Spectroscopy, I-50019 Sesto Fiorentino, Italy;
INRIM Istituto Nazionale di Ricerca Metrologica, I-10135 Torino, Italy;
INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, I-50019 Sesto Fiorentino, Italy;
INFN Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, I-50019 Sesto Fiorentino, Italy

Abstract: We report on the experimental observation of a strongly interacting gas of ultracold two-electron fermions with an orbital degree of freedom and magnetically tunable interactions. This realization has been enabled by the demonstration of a novel kind of Feshbach resonance occurring in the scattering of two Yb-173 atoms in different nuclear and electronic states. The strongly interacting regime at resonance is evidenced by the observation of anisotropic hydrodynamic expansion of the two-orbital Fermi gas. These results pave the way towards the realization of new quantum states of matter with strongly correlated fermions with an orbital degree of freedom.


Volume: 115 (26)      Pages from: 265301-1  to: 265301-5

More Information: We thank F. Poggiali for experimental assistance and we acknowledge H. Zhai, S. Stringari, F. Minardi, and M. Zaccanti for inspiring discussions. This work has been supported by EU FP7 SIQS, MIUR PRIN2012 AQUASIM, and INFN FISh.
KeyWords: Degrees of freedom (mechanics); Electron gas; Quantum theory; Resonance, At resonance; Fermi gas; Feshbach resonances; Hydrodynamic expansion; Orbital degree of freedom; Quantum state; Strongly correlated fermions; Ultra-cold, Fermions
DOI: 10.1103/PhysRevLett.115.265301

Citations: 115
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