Superkicks and the photon angular and linear momentum density
arXiv:2202.09655 · doi:10.1103/PhysRevA.105.L061503
Abstract
We address a problem of proper definition of momentum density for spatially structured electromagnetic fields. We show that the expressions for the momentum and angular momentum obtained locally are not the same when one uses the canonical energy-momentum tensor instead of the symmetric Belinfante energy-momentum tensor in electrodynamics. This has important consequences for interaction of matter with structured light, for example, twisted photons; and would give drastically different results for forces and angular momenta induced on small test objects. We show, with numerical estimates of the size of the effects, situations where the canonical and symmetrized forms induce very different torques or (superkick) recoil momenta on small objects or atomic rotors, over a broad range of circumstances.
arXiv comment5 pages, 4 figures
References in corpus (13)
- Transverse and longitudinal angular momenta of light
- The angular momentum controversy: What's it all about and does it matter?
- Generation of High-Energy Photons with Large Orbital Angular Momentum by Compton Backscattering
- Compton Upconversion of Twisted Photons: Backscattering of Particles with Non-Planar Wave Functions
- Off-axis excitation of hydrogenlike atoms by twisted photons
- Experimental Verification of Position-Dependent Angular-Momentum Selection Rules for Absorption of Twisted Light by a Bound Electron
- Resolution of a conflict between Laser and Elementary Particle Physics
- Coherent Control of the Rotational Degree of Freedom of a Two-Ion Coulomb Crystal
- Recoil Momentum Effects in Quantum Processes Induced by Twisted Photons
- Surface angular momentum of light beams
- Observability of the superkick effect within a quantum-field-theoretical approach
- Anomalous Geometric Spin Hall Effect of Light?
- Measurement of Optical Orbital and Spin Angular Momentum: Implications for Photon Angular Momentum