Generation of Quantum Vortex Electrons with Intense Laser Pulses

Area of Science:

• * Particle and Nuclear Physics
• * Quantum Electrodynamics
• * Laser-Plasma Physics

Background:

• * High-energy electrons are fundamental to particle and nuclear physics research.
• * Manipulating electron wave functions can unlock new physical phenomena.
• * Intense laser pulses offer a tool for controlling energetic particles.

Purpose of the Study:

• * To investigate the interaction between high-energy electrons and intense, circularly polarized laser pulses.
• * To explore the efficient transfer of angular momentum from photons to electrons.
• * To demonstrate the generation of electrons with quantum vortex states.

Main Methods:

• * Theoretical modeling using nonlinear quantum electrodynamics (QED).
• * Simulation of electron scattering with femtosecond intense laser pulses.
• * Analysis of electron wave function transformation and emitted photon spectra.

Main Results:

• * A regime was identified for efficient transfer of photon spin angular momentum to electron orbital angular momentum (OAM).
• * GeV-level electrons acquired significant intrinsic OAM (> ħ) at laser intensities of 10^20 W cm^-2.
• * Scattered electrons exhibited a twisted wave function, forming a quantum vortex state.
• * Emitted gamma-photons displayed a distinct two-peak spectrum.

Conclusions:

• * Femtosecond intense lasers can effectively twist electron wave functions into quantum vortex states.
• * This method provides a novel way to generate relativistic leptons with OAM using existing laser technology.
• * The findings pave the way for new sources in particle and nuclear physics.
• * The unique spectral signature of emitted photons distinguishes these vortex electrons.