Onset of Fermi degeneracy in a trapped atomic gas
Onset of Fermi degeneracy in a trapped atomic gas
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DOI：
10.1126/science.285.5434.1703
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发表时间：
1999-09-10
期刊：
影响因子：
56.9
通讯作者：
Jin, DS
中科院分区：
文献类型：
--
作者：
DeMarco, B;Jin, DS
采用双组分费米气体的蒸发冷却策略将7 × 10（5）K-40原子的磁捕获气体冷却到费米温度T-F的0.5。在这个温度范围内，最低能量下的状态占据从高温下的基本为零增加到近60%，量子简并被观察到作为蒸发冷却的障碍和热力学的修改。对受限费米气体的动量分布和总能量的测量直接揭示了量子统计。
An evaporative cooling strategy that uses a two-component Fermi gas was employed to cool a magnetically trapped gas of 7 X 10(5) K-40 atoms to 0.5 of the Fermi temperature T-F. In this temperature regime, where the state occupation at the Lowest energies has increased from essentially zero at high temperatures to nearly 60 percent, quantum degeneracy was observed as a barrier to evaporative cooling and as a modification of the thermodynamics. Measurements of the momentum distribution and the total energy of the confined Fermi gas directly revealed the quantum statistics.