Title: Observation of a giant Goos-Hänchen shift for matter waves Show Chinese title

Title: 物质波的巨大大气-亨钦位移观测

Abstract: The Goos-H\"anchen (GH) shift describes a phenomenon in which a specularly-reflected beam is laterally translated along the reflecting surface such that the incident and reflected rays no longer intersect at the surface. Using a neutron spin-echo technique and a specially-designed magnetic multilayer mirror, we have measured the relative phase between the reflected up and down neutron spin states in total reflection. The relative GH shift calculated from this phase shows a strong resonant enhancement at a particular incident neutron wavevector, which is due to a waveguiding effect in one of the magnetic layers. Calculations based on the observed phase difference between the neutron states indicate a propagation distance along the waveguide layer of 0.65 mm for the spin-down state, which we identify with the magnitude of the giant GH shift. The existence of a physical GH shift is confirmed by the observation of neutron absorption in the waveguide layer. We propose ways in which our experimental method may be exploited for neutron quantum-enhanced sensing of thin magnetic layers. Show Chinese abstract

Abstract: 戈斯-亨钦（GH）位移描述了一种现象，其中镜面反射的光束沿反射表面发生横向平移，使得入射和反射光线不再在表面相交。 使用中子自旋回波技术以及一种专门设计的磁性多层镜，我们测量了总反射中反射的向上和向下中子自旋态之间的相对相位。 从该相位计算出的相对GH位移在特定入射中子波矢处表现出强烈的共振增强，这是由于磁性层之一中的波导效应所致。 基于中子态之间观察到的相位差计算表明，自旋向下的状态在波导层中的传播距离为0.65毫米，我们将其与巨GH位移的大小联系起来。 通过观察波导层中的中子吸收，证实了物理GH位移的存在。 我们提出了利用这种实验方法对薄磁层进行中子量子增强传感的方法。