Reaching Fermi Degeneracy via Universal Dipolar Scattering
Reaching Fermi Degeneracy via Universal Dipolar Scattering
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DOI：
10.1103/physrevlett.112.010404
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发表时间：
2014-01-06
影响因子：
8.6
通讯作者：
Ferlaino, F.
中科院分区：
文献类型：
--
作者：
Aikawa, K.;Frisch, A.;Ferlaino, F.
本文报道了铒原子简并偶极费米气体的产生。我们在一个完全自旋极化的样品中强制蒸发冷却，温度低至费米温度的0.2倍。强磁偶极-偶极相互作用使得即使在零能量极限下，相同费米子之间也能发生弹性碰撞。测得的弹性散射截面与偶极散射理论的预测吻合得很好，偶极散射理论遵循仅取决于偶极矩和原子质量的普适标度律。我们的量子简并方法具有很高的冷却效率，并提供了大的原子密度，它可以扩展到各种偶极系统。
We report on the creation of a degenerate dipolar Fermi gas of erbium atoms. We force evaporative cooling in a fully spin-polarized sample down to temperatures as low as 0.2 times the Fermi temperature. The strong magnetic dipole-dipole interaction enables elastic collisions between identical fermions even in the zero-energy limit. The measured elastic scattering cross section agrees well with the predictions from the dipolar scattering theory, which follow a universal scaling law depending only on the dipole moment and on the atomic mass. Our approach to quantum degeneracy proceeds with very high cooling efficiency and provides large atomic densities, and it may be extended to various dipolar systems.