标题： 双色旋转电场中真空对产生中的自旋效应 显示英文标题

标题： Spin effect in vacuum pair production under two-color rotating electric fields

摘要： 我们研究了自旋效应对由 Dirac-Heisenberg-Wigner (DHW) 形式论描述的在双色反向旋转电场中真空对产生过程的影响。我们主要研究了场不对称性、时间延迟和频率啁啾对粒子动量谱的综合影响，考虑和不考虑自旋效应的情况都进行了分析。我们观察到即使在纯电场中，真空对产生过程也表现出自旋依赖性，并且对场参数的变化敏感。结果表明，在不同不对称场中具有不同啁啾值和时间延迟的情况下，自旋相关的动量谱表现出不同的结果。对于具有大啁啾和时间延迟的扩展不对称场，粒子数密度可以增加六个数量级以上。对于具有小频率啁啾的对称场，自旋向上和自旋向下的粒子数量大致相当；而对于较大的啁啾，自旋向上粒子占主导地位。然而，在不对称场的情况下，场不对称性和啁啾参数的增加导致自旋不对称度发生反转。对于具有大频率啁啾的缩短不对称电场，自旋向上粒子的数量增加，导致自旋不对称度为$98.62\%$。相反，在扩展的不对称场中，自旋向下粒子的数量显著增加，这对应于自旋不对称度为$99.94\%$。 显示英文摘要

摘要： We investigated the spin effect on the vacuum pair production by Dirac-Heisenberg-Wigner (DHW) formalism under two-color counter-rotating electric fields. We primarily studied the combined effects of the field asymmetry, time delay, and frequency chirp on the particle momentum spectrum with and without considering the spin effect. We have observed that the vacuum pair production process demonstrates spin dependence even in a pure electric field and is sensitive to variations in the field parameters. The results indicate that the spin-dependent momentum spectrum exhibited distinct outcomes for various asymmetric fields with different chirp values and time delay. For an extended asymmetric field with large chirp and time delay, the particle number density can be increased by more than six orders of magnitude. The spin-up and spin-down particles are approximately comparable for a symmetric field with a small-frequency chirp and are dominated by the spin-up particles for a larger chirp. However, in the case of an asymmetric field, the increase in field asymmetry and the chirp parameter lead to a reversal of the spin asymmetry degree. For a shortened asymmetric electric field with a large-frequency chirp, the number of spin-up particles increases, leading to a spin asymmetry degree of $98.62\%$. Conversely, in an extended asymmetric field, the number of spin-down particles increases significantly, which corresponds to a spin asymmetry degree of $99.94\%$.