Spin-polarization effects of ultrarelativistic electron beam in ultraintense two-color laser pulses

Spin-polarization effects of an ultrarelativistic electron beam head-on colliding with ultraintense two-color laser pulses are investigated comprehensively in the quantum radiation-dominated regime. We employ a Monte Carlo method, derived from the recent work of [Phys. Rev. Lett. {\bm 122}, 154801 (2019)], to calculate the spin-resolved electron dynamics and photon emissions in the local constant field approximation. We find that electron radiation probabilities in adjacent half cycles of a two-color laser field are apparently asymmetric due to radiative spin effects, and consequently, after interaction the electron beam can have a total polarization of about 11\% and a partial polarization of up to about 63\%, with currently achievable laser facilities, which may be utilized in high-energy physics and nuclear physics. Moreover, the considered effects are shown to be robust with respect to the laser and electron beam parameters.