Manipulating Twisted Electrons in Strong-Field Ionization
arXiv:2010.08355 · doi:10.1039/D0FD00105H
Abstract
We investigate the discrete orbital angular momentum (OAM) of photoelectrons freed in strongfield ionization. We use these `twisted' electrons to provide an alternative interpretation on existing experimental work of vortex interferences caused by strong field ionization mediated by two counterrotating circularly polarized pulses separated by a delay. Using the strong field approximation, we derive an interference condition for the vortices. In computations for a neon target we find very good agreement of the vortex condition with photoelectron momentum distributions computed with the strong field approximation, as well as with the time-dependent methods Qprop and R-Matrix. For each of these approaches we examine the OAM of the photoelectrons, finding a small number of vortex states localized in separate energy regions. We demonstrate that the vortices arise from the interference of pairs of twisted electron states. The OAM of each twisted electron state can be directly related to the number of arms of the spiral in that region. We gain further understanding by recreating the vortices with pairs of twisted electrons and use this to determine a semiclassical relation for the OAM. A discussion is included on measuring the OAM in strong field ionization directly or by employing specific laser pulse schemes as well as utilizing the OAM in time-resolved imaging of photo-induced dynamics.
arXiv comment14 pages, 4 figures, publication prepared for the the strong field theme of the Faraday Discussions conference: Time-resolved imaging of photo-induced dynamics
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- Conservation laws for Electron Vortices in Strong-Field Ionisation
- Carrier-envelope-phase and helicity control of electron vortices in photodetachment
- Generation of vortex electrons by atomic photoionization
- Triple differential cross-section for the twisted electron impact ionization of water molecule
- Detangling the quantum tapestry of intra-channel interference in below-threshold nonsequential double ionization with few-cycle laser pulses
- Exploring symmetries in photoelectron holography with two-color linearly polarized fields
- Elastic scattering of twisted electrons by CO molecules at high energies