# Radiative deflection by spin effect in the quantum radiation-reaction regime

## TL;DR

This paper investigates how spin-dependent radiation-reaction causes asymmetric electron deflection in ultra-intense laser interactions, revealing a new mechanism for observing quantum radiation effects in strong-field QED.

## Contribution

It introduces a novel mechanism showing how spin-dependent radiation-reaction leads to measurable electron deflections in strong laser fields, advancing experimental detection methods.

## Key findings

- Anti-symmetric electron deflection based on spin states.
- Radiation-reaction force's work varies with spin orientation.
- Accumulated deflection due to oscillating magnetic fields.

## Abstract

The colliding between ultra-relativistic electrons and an ultra-intense laser pulse is a powerful approach to testify the physics in strong-field QED regime. By considering spin-dependent radiation-reaction during laser-electron collision we find anti-symmetric deflection of electrons with different spin states. We revealed that such deflection is induced by the non-zero work done by radiation-reaction force along field polarization-direction in a half-period of phase, which is larger for spin-anti-paralleled electrons and smaller for spin-paralleled electrons. The spin-projection on the magnetic field of an electron gets inversed in adjacent half-periods due to oscillating magnetic field and therefore the deflection due to spin-dependent radiation is accumulated rather than vanishing. The new mechanism provides an extra dimension to observe quantum radiation-reaction effect in the strong-field QED regime by measuring the anti-symmetric distribution.