Twisting Neutral Particles with Electric Fields

Abstract

We demonstrate that spin-orbit coupled states are generated in neutral magnetic spin 1/2 particles travelling through an electric field. The quantization axis of the orbital angular momentum is parallel to the electric field, hence both longitudinal and transverse orbital angular momentum can be created. Furthermore we show that the total angular momentum of the particle is conserved. Finally we propose a neutron optical experiment to measure the transverse effect.

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• Elastic scattering of twisted neutrons by nuclei
• Quantum interference between fundamentally different processes is enabled by shaped input wavefunctions
• Definitive Detection of Orbital Angular Momentum States in Neutrons by Spin-polarized ${}^3$He
• Spin-Textured Neutron Beams with Orbital Angular Momentum
• Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US