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 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.
- Received 14 September 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.265301
© 2015 American Physical Society
Viewpoint
Controlling Collisions in a Two-Electron Atomic Gas
Published 21 December 2015
Two separate groups have managed to control the interactions in a cold atomic gas in which each atom has two valence electrons.
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