Evaporative Cooling of a Two-Component Degenerate Fermi Gas
Evaporative Cooling of a Two-Component Degenerate Fermi Gas
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DOI：
10.1103/physreva.61.053610
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发表时间：
1999-11
影响因子：
2.9
通讯作者：
Murray Holland;B. DeMarco;Deborah Jin
中科院分区：
文献类型：
--
作者：
Murray Holland;B. DeMarco;Deborah Jin
推导了两组分简并费米气体蒸发冷却的量子理论，结果表明粒子的量子统计对最佳冷却轨迹有很大影响。在低温下，由于在每个二元碰撞事件中可用终态的泡利阻塞，冷却效率降低。我们对K-40的量子简并云进行了冷却实验数据和理论最优轨迹的比较，结果表明，现在可以实现低至0.3倍费米温度的冷却。
We derive a quantum theory of evaporative cooling for a degenerate Fermi gas with two constituents and show that the optimum cooling trajectory is influenced significantly by the quantum statistics of the particles. The cooling efficiency is reduced at low temperatures due to Pauli blocking of available final states in each binary collision event. We compare the theoretical optimum trajectory with experimental data on cooling a quantum degenerate cloud of potassium-40, and show that temperatures as low as 0.3 times the Fermi temperature can now be achieved.