By Kirk W Madison, Kai Bongs, Lincoln D Carr, Ana Maria Rey, Hui Zhai
The purpose of this booklet is to provide evaluate articles describing the most recent theoretical and experimental advancements within the box of chilly atoms and molecules. Our wish is this sequence will advertise examine by means of either highlighting contemporary breakthroughs and via outlining probably the most promising study instructions within the field.
Readership: study scientists together with graduate scholars and top point undergraduate scholars.
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Extra info for Annual Review of Cold Atoms and Molecules, volume 2
6. Dependence of elastic-scattering cross-sections σ on collision energy E in Kelvin for selected strontium isotopes. The thick lines are cross-sections including partial waves up to = 4. Shape resonances are indicated. Thin lines indicate cross-section contributions from = 0 only. The data symbols are cross-section measurements from thermalization experiments,121 and the respective collision energies are set to E = k B T , where T is the sample temperature. The figure is taken from Ref. 14. February 25, 2014 14:50 Annual Review of Cold Atoms and Molecules, Volume 2 Degenerate Quantum Gases of Strontium 9inx6in b1749-ch01 25 86 Sr−86 Sr collision cross-sections vary significantly with collision energy, even at energies below 1 µK.
The large vertical trap frequency allows us to perform evaporation very quickly, in just 800 ms, which helps to avoid strong atom loss from three-body collisions. The onset of BEC is observed after 600 ms February 25, 2014 14:50 Annual Review of Cold Atoms and Molecules, Volume 2 36 9inx6in b1749-ch01 S. Stellmer, F. Schreck & T. C. 5×105 atoms present. Further evaporation results in almost pure BECs of 25,000 atoms. 1 s. Such a BEC with a large scattering length might constitute a good starting point for studies of OFRs.
At this point, the ultracold gas contains 9 × 106 atoms at a temperature of 900 nK. February 25, 2014 14:50 Annual Review of Cold Atoms and Molecules, Volume 2 Degenerate Quantum Gases of Strontium 9inx6in b1749-ch01 33 To render the atoms transparent to cooling light in a central region of the laser cooled cloud, we induce a light shift on the 3P1 state, using a “transparency” laser beam 15 GHz blue-detuned to the 3P1 − 3S1 transition. 7 kW/cm2 . It upshifts the 3P1 state by more than 10 MHz and also influences the nearest molecular level tied to the 3P1 state significantly.