A chromium dipolar Fermi sea

Abstract

We report on the production of a degenerate Fermi gas of 53Cr atoms, polarized in the state F=9/2, m_F=-9/2, by sympathetic cooling with bosonic S=3, m_S=-3 52Cr atoms. We load in an optical dipole trap 3.10^4 53Cr atoms with 10^6 52Cr atoms. Despite this initial small number of fermionic atoms, we reach a final temperature of T=0.6 T_f (Fermi temperature), with up to 10^3 53Cr atoms. This surprisingly efficient evaporation stems from an inter-isotope scattering length |a_{BF}| = (85+/- 10) a_{Bohr} which is small enough to reduce evaporative losses of the fermionic isotope, but large enough to insure thermalization.

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References in corpus (9)

• Bose-Einstein condensation of chromium
• Bose-Einstein Condensation of Erbium
• Quantum degenerate dipolar Fermi gas
• Stabilizing a purely dipolar quantum gas against collapse
• d-wave collapse and explosion of a dipolar Bose-Einstein condensate
• Anomalous Behavior of Spin Systems with Dipolar Interactions
• Observation of Fermi surface deformation in a dipolar quantum gas
• Simultaneous Magneto-Optical Trapping of Bosonic and Fermionic Chromium Atoms
• Dipolar atomic spin ensembles in a double-well potential

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• Competition between Bose Einstein Condensation and spin dynamics
• Anisotropic collisions of dipolar Bose-Einstein condensates in the universal regime
• The Symplectic Fermi Liquid and its realization in cold atomic systems
• Fractional quantum Hall states of dipolar fermions in a strained optical lattice