关于准粒子衰变的初始阶段
On the initial stage of quasiparticle decay
摘要：
费米液体中准粒子衰变的初始阶段由不同于从费米黄金法则方法导出的散射率的时间尺度决定。我们表明，初始衰减是非指数的，它是由零阶谱矩的电子自能。通过与有限小碎片态组态相互作用的精确计算结果的比较，对自能的几种近似方法进行了数值分析。本文提出了一种计算大系统准粒子态扩散的简单数值方法。
英文摘要：
The initial stages of the quasiparticle decay in a Fermi liquid are governed by a time-scale distinct from the scattering rates as derived from the Fermi golden rule approach. We show that the initial decay is nonexponential and that it is determined by the zeroth spectral moment of the electron self-energy. We analyzed numerically a number of approximations for the self-energy by comparing with exact configuration interaction calculations for small finite system with fragmented states. A numerically simple approach for computing the spreading of the quasiparticle states for large systems is devised.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
