Stas R J W, McNamara J M, Hogervorst W, Vassen W
Laser Centre Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
Phys Rev Lett. 2004 Jul 30;93(5):053001. doi: 10.1103/PhysRevLett.93.053001. Epub 2004 Jul 27.
We simultaneously confine fermionic metastable 3He atoms and bosonic metastable 4He atoms in a magneto-optical trap. The trapped clouds, containing up to 1.5 x 10(8) atoms of each isotope, are characterized by measuring ions and metastable helium atoms escaping from the trap. Optical pumping of 3He atoms to a nontrapped hyperfine state is investigated and it is shown that large atom numbers can be confined without additional repumping lasers. Unique possibilities for quantum degeneracy experiments with mixtures of spin-polarized metastable 3He and 4He atoms are indicated.
我们在磁光阱中同时囚禁费米子亚稳态3He原子和玻色子亚稳态4He原子。通过测量从陷阱中逸出的离子和亚稳态氦原子来表征捕获的云团，其中每种同位素的原子数可达1.5×10⁸ 个。研究了将3He原子光抽运到非捕获超精细态的情况，结果表明无需额外的再抽运激光就能囚禁大量原子。文中指出了利用自旋极化的亚稳态3He和4He原子混合物进行量子简并实验的独特可能性。
