Optimizing the incident electron momentum for resonant few-photon Kapitza-Dirac scattering in bichromatic laser fields

TL;DR

This paper investigates how adjusting the incident electron momentum can optimize resonant few-photon Kapitza-Dirac scattering in bichromatic laser fields, accounting for electron spin and deriving analytical formulas for specific photon processes.

Contribution

It introduces a method to optimize electron momentum to compensate field-induced detuning in spin-dependent and independent Kapitza-Dirac scattering, with analytical formulas derived.

Findings

Analytical formulas for optimized electron momentum in three-photon and four-photon processes.

Demonstration of detuning compensation through incident momentum adjustment.

Insights into spin effects in resonant scattering processes.

Abstract

Nonrelativistic Kapitza-Dirac scattering of electrons from counterpropagating bichromatic laser waves is studied in the resonant Bragg regime, taking the electron spin into account. We show that the intrinsic field-induced detuning, which arises in the Rabi oscillation dynamics between initial and scattering state of the electron, can be compensated by a suitable adjustment of its incident momentum. Analytical formulas of the optimized electron momentum for spin-dependent three-photon and spin-independent four-photon Kapitza-Dirac scattering are obtained from simplified model systems in reduced dimensionality, which preserve the characteristic properties of the process.