Double resonance of Raman transitions in a two-electron degenerate Fermi gas of ytterbium atoms

Jeong Ho Han, Jin Hyoun Kang, Moosong Lee +1 more

Takeshi Fukuhara, Yosuke Takasu, Seiji Sugawa +1 more

Chengdong He, Bo Song, Elnur Haciyev +5 more

Xiong-Jun Liu, Chengdong He, Zejian Ren +3 more

Moosong Lee, Jeong Ho Han, Jin Hyoun Kang +2 more

Momentum-resolved Raman spectra of a spin-polarized Fermi gas of ytterbium atoms are measured, and it is found that double resonances of first- and second-order Raman transitions can occur at certain magnetic fields. This implies that the conventional Raman laser dressing scheme provides two ways of spin-orbit coupling, and intrinsically generates a spinful band structure without the aid of an additional rf field.

Min‐Seok Kim, Moosong Lee, Jeong Ho Han +1 more

We describe our experimental apparatus for generating quantum degenerate gases of bosonic 174Yb and fermionic 173Yb atoms. We use a Zeeman slower to generate a slow atomic beam and collect atoms in a magneto-optical trap formed by 556-nm laser beams without frequency modulations. Laser-cooled ytterbium atoms are transferred to a crossed optical dipole trap and evaporatively cooled to quantum degeneracy. Our system generates a Bose-Einstein condensate containing over 6 × 104 174Yb atoms or a degenerate Fermi gas of about 7 × 104 173Yb atoms at T/T F =0.8(1), where T F is the Fermi temperature of the gas. We highlight the high performance of the Zeeman slower and the home-made frequency-doubling systems for 399-nm and 556-nm lasers.