Observation of two-fluid phenomena and measurement of transport coefficients for strongly correlated Fermi gases

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We developed a simultaneous laser cooling system of lithium 6 atoms and lithium 7 atoms in order to investigate two-fluid phenomena which have shown in metal superconductors and superfluid helium. Both atomic spices were collected up to one hundred million atoms within 30s. We succeeded in loading cold atoms from a MOT into an optical dipole trap with an efficiency of 5%. After an evaporative cooling process, 100,000 of atoms reached a temperature down to T/TF=0.05 and they showed a superfluid phase transition. Furthermore, we measured a temperature of interacting lithium 6 atoms by mixing lithium 7 atoms in an optical trap as a thermometer at a BCS interaction regime. We are ready to investigate two-fluid phenomena.