State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA and Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.
Phys Rev Lett. 2014 Jun 27;112(25):250401. doi: 10.1103/PhysRevLett.112.250401. Epub 2014 Jun 23.
It is well known that the magnetic Feshbach resonances of cold atoms are sensitive to the magnitude of the external magnetic field. Much less attention has been paid to the direction of such a field. In this work we calculate the scattering properties of spin polarized fermionic atoms in reduced dimensions, near a p-wave Feshbach resonance. Because of the spatial anisotropy of the p-wave interaction, the scattering has a nontrivial dependence on both the magnitude and the direction of the magnetic field. In addition, we identify an inelastic scattering process which is impossible in the isotropic-interaction model; the rate of this process depends considerably on the direction of the magnetic field. Significantly, an Einstein-Podolsky-Rosen entangled pair of identical fermions may be produced during this inelastic collision. This work opens a new method to manipulate resonant cold atomic interactions.
众所周知，冷原子的磁费什巴赫共振对外部磁场的大小很敏感。但人们对磁场的方向关注较少。在这项工作中，我们计算了在 p 波费什巴赫共振附近，降低维度时极化费米子原子的散射性质。由于 p 波相互作用的空间各向异性，散射对磁场的大小和方向具有复杂的依赖性。此外，我们还确定了在各向同性相互作用模型中不可能发生的非弹性散射过程；该过程的速率与磁场的方向有很大关系。重要的是，在这种非弹性碰撞过程中，可能会产生一对爱因斯坦-波多尔斯基-罗森纠缠的相同费米子。这项工作为操控共振冷原子相互作用开辟了新的方法。
