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Physical Review A

Optical dipole force trapping of a fermion-boson mixture of ytterbium isotopes

Keita HONDA, Yosuke Takasu, T. Kuwamoto, M. Kumakura, Yoshiro Takahashi, T. Yabuzaki

Published Aug 26, 2002• 38 citations
Publisher

Abstract

We have succeeded in simultaneously trapping a fermion and boson isotope pair of ytterbium (Yb) in a far off-resonant trap (FORT). We have found evidence of elastic cross collisions between fermions and bosons, and performed a successful sympathetic cooling of the fermions. We could also enhance the loading of the fermions ${}^{171}\mathrm{Yb}$ in the crossing region in a crossed FORT via cross collisions between the fermions ${}^{171}\mathrm{Yb}$ and the bosons ${}^{174}\mathrm{Yb}.$

DOI
10.1103/physreva.66.021401

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Conference on Lasers and Electro-Optics•Jan 1, 2005•0 citations
We have succeeded in simultaneously trapping a fermion and boson isotope pair of ytterbium (Yb) in a far off-resonant trap (FORT). We have found evidence of elastic cross collisions between fermions and bosons, and performed a successful sympathetic cooling of the fermions. We could also enhance the loading of the fermions 171Yb{}^{171}\mathrm{Yb}171Yb in the crossing region in a crossed FORT via cross collisions between the fermions 171Yb{}^{171}\mathrm{Yb}171Yb and the bosons 174Yb.{}^{174}\mathrm{Yb}.174Yb.
Working with ytterbium (Yb), we demonstrate dual-isotope magneto-optic traps of extreme experimental simplicity yet containing either fermion-boson or boson-boson isotope pairs. Pairs studied include 171Yb+172Yb{}^{171}{\mathrm{Y}\mathrm{b}+}^{172}\mathrm{Yb}171Yb+172Yb (a fermion-boson mixture) and 176Yb+174Yb{}^{176}{\mathrm{Y}\mathrm{b}+}^{174}\mathrm{Yb}176Yb+174Yb and 174Yb+172Yb{}^{174}{\mathrm{Y}\mathrm{b}+}^{172}\mathrm{Yb}174Yb+172Yb (boson-boson mixtures). Trapping is performed using the Yb ${(6s}^{2}{)}^{1}{S}_{0}{\ensuremath{-}(6s6p)}^{1}{P}_{1}$ transition, an uncooled thermal source, and bichromatic trapping beams. Static and dynamic properties of the composite cloud are conveniently probed on the spin-forbidden ${(6s}^{2}{)}^{1}{S}_{0}{\ensuremath{-}(6s6p)}^{3}{P}_{1}$ transition. A unique strategy for continuously loading these samples into magnetic traps is described.
Evaporative cooling of ultracold Yb atoms near the quantum-degenerate regime was experimentally studied. Three bosons of 170 Yb, 172 Yb, 176 Yb and two fermions of 171 Yb and 173 Yb were evaporatively cooled in a crossed far-off resonant trap (FORT). We observed that 170 Yb and 172 Yb were not concentrated into the crossed region. We found that, in the cases of 176 Yb atoms, atoms were concentrated well into the crossed region. The following evaporative cooling in the crossed region, however, did not work well. We performed the simultaneous trapping and sympathetic cooling in the crossed FORT by use of 172 Yb-174Yb, 174 Yb- 176 Yb, 172 Yb- 176 Yb, and 171 Yb- 174 Yb pairs. We observed that evaporative cooling worked well. This result shows that we succeeded in the enhancement of the atom collision rate. Especially, by use of 174 Yb- 176 Yb mixture, we obtained cold 176 Yb whose phase space density was 0.02. We observed a large atom loss, which limited the further sympathetic evaporative cooling. We also evaporatively cooled 174 Yb in a 1D optical lattice. Evaporative cooling worked very well because the atoms were initially trapped at a high density. After evaporative cooling, we obtained very cold atoms, and T/T F was estimated to be 1.2.
Evaporative cooling of ultracold Yb atoms near the quantum-degenerate regime was experimentally studied. Three bosons of 170Yb, 172Yb, 176Yb and two fermions of 171Yb and 173Yb were evaporatively cooled in a crossed far-off resonant trap (FORT). We observed that 170Yb and 172Yb were not concentrated into the crossed region. We found that, in the cases of 176Yb atoms, atoms were concentrated well into the crossed region. The following evaporative cooling in the crossed region, however, did not work well. We performed the simultaneous trapping and sympathetic cooling in the crossed FORT by use of 172Yb-174Yb, 174Yb-176Yb, 172Yb-176Yb, and 171Yb-174Yb pairs. We observed that evaporative cooling worked well. This result shows that we succeeded in the enhancement of the atom collision rate. Especially, by use of 174Yb-176Yb mixture, we obtained cold 176Yb whose phase space density was 0.02. We observed a large atom loss, which limited the further sympathetic evaporative cooling. We also evaporatively cooled 174Yb in a 1D optical lattice. Evaporative cooling worked very well because the atoms were initially trapped at a high density. After evaporative cooling, we obtained very cold atoms, and T/TF was estimated to be 1.2.