• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Nonadiabatic Dynamics Of Electron Scattering From Adsorbates In Surface Bands
【24h】

Nonadiabatic Dynamics Of Electron Scattering From Adsorbates In Surface Bands

机译：电子在表面带中从吸附物中散射的非绝热动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present a comparative study of nonadiabatic dynamics of electron scattering in quasi-two-dimensional surface band which is induced by the long-range component of the interactions with a random array of adsorbates. Using three complementary model descriptions of intraband spatiotemporal propagation of quasi-particles that go beyond the single-adsorbate scattering approach we are able to identify distinct subsequent regimes of evolution of an electron following its promotion into an unoccupied band state: (ⅰ) early quadratic or ballistic decay of the initial-state survival probability within the Heisenberg uncertainty window, (ⅱ) preas-ymptotic exponential decay governed by the self-consistent Fermi golden rule scattering rate, and (ⅲ) asymptotic decay described by a combined inverse power-law and logarithmic behavior. The developed models are applied to discuss the dynamics of intraband adsorbate-induced scattering of hot electrons excited into the n=1 image-potential band on Cu(100) surface during the first stage of a two-photon photoemission process. Estimates of crossovers between the distinct evolution regimes enable assessments of the lifespan of a standard quasiparticle behavior and thereby of the range of applicability of the widely used Fermi golden rule and optical Bloch equations approach for description of adsorbate-induced quasiparticle decay and dephasing in ultrafast experiments.
机译：我们目前对准二维表面带中电子散射的非绝热动力学进行比较研究，这是由与随机排列的吸附物相互作用的远距离分量引起的。使用超越单吸附物散射方法的准粒子的带内时空传播的三个互补模型描述，我们能够识别出电子被提升为未占据的能带态后电子演化的不同后续机制：（ⅰ）早期二次或在海森堡不确定性窗口内的初始状态生存概率的弹道衰减，（by）由自洽费米黄金法则散射率控制的渐近指数衰减，以及（ⅲ）由逆幂定律和对数行为。所开发的模型用于讨论在双光子光发射过程的第一阶段，带内吸附物诱导的热电子在Cu（100）表面上被激发为n = 1图像势能带的散射的动力学。估计不同演化机制之间的交叉点可以评估标准准粒子行为的寿命，从而可以评估广泛使用的费米黄金法则和光学布洛赫方程方法的适用范围，该方法可描述吸附物诱导的准粒子在超快实验中的衰变和相移。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号