Four-quantum RF-resonance in the ground state of an alkaline atom

Evgeny B. Alexandrov, Anatoly S. Pazgalev

Ермак Сергей Викторович, A. A. Podvyaznyi, V. V. Semenov

Ren Zhang, Deping Zhang, Yanting Cheng +3 more

Alkaline-earth-metal atoms have a long-lived electronic excited state, and when atoms in this excited state are localized in the Fermi sea of ground-state atoms by an external potential, they serve as magnetic impurities, due to the spin-exchange interaction between the excited- and the ground-state atoms. This can give rise to the Kondo effect. However, in order to achieve this effect in current atomic gas experiments, it requires the Kondo temperature to be increased to a sizable portion of the Fermi temperature. In this paper we calculate the confinement-induced resonance (CIR) for the spin-exchanging interaction between the ground and the excited states of the alkaline-earth-metal atoms and propose that the spin-exchange interaction can be strongly enhanced by utilizing the CIR. We analyze this system by the renormalization-group approach and show that near a CIR, the Kondo temperature can be significantly enhanced.

M. Boström, Jevon J. Longdell, D.J. Mitchell +1 more

Thomas H. Loftus, Jason R. Bochinski, THOMAS W. MOSSBERG

Summary form only given. Atomic ytterbium (Yb), magnesium (Mg), calcium (Ca), and strontium (Sr) possess simple internal level structure and a diversity of naturally abundant fermionic and bosonic isotopes, making these atoms ideal testing grounds for cold collision theories and future studies of weakly-interacting quantum degenerate gases. Lacking useful magnetic ground-state sub-structure, however, these atoms cannot be driven into the quantum degenerate regime by pursuing the only proven strategy, ground-state magnetic trapping followed by forced RF evaporation. We propose a novel solution to this problem that involves magnetic trapping in the low-lying /sup 3/P/sub 2/ metastable excited state and demonstrate the possibility for deep magnetic traps using field gradients identical to those currently used for /sup 1/S/sub 0/-/sup 1/P/sub 1/ Yb and alkaline-earth magneto-optical traps.

Eyal Schwartz, Pimonpan Sompet, Y. H. Fung +1 more