Challis K J, Ballagh R J, Gardiner C W
Jack Dodd Centre for Photonics and Ultra-Cold Atoms, Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand.
Phys Rev Lett. 2007 Mar 2;98(9):093002. doi: 10.1103/PhysRevLett.98.093002. Epub 2007 Feb 28.
We present a theoretical treatment of Bragg scattering of a degenerate Fermi gas in the weakly interacting BCS regime. Our numerical calculations predict correlated scattering of Cooper pairs into a spherical shell in momentum space. The scattered shell of correlated atoms is centered at half the usual Bragg momentum transfer, and can be clearly distinguished from atoms scattered by the usual single-particle Bragg mechanism. We develop an analytic model that explains key features of the correlated-pair Bragg scattering, and determine the dependence of that scattering on the initial pair correlations in the gas.
我们给出了在弱相互作用BCS区域中简并费米气体的布拉格散射的理论处理。我们的数值计算预测了库珀对在动量空间中散射到一个球壳内的关联散射。关联原子的散射壳以通常布拉格动量转移的一半为中心，并且可以与通过通常的单粒子布拉格机制散射的原子清晰区分开来。我们建立了一个解析模型，该模型解释了关联对布拉格散射的关键特征，并确定了该散射对气体中初始对关联的依赖性。
