Shake-up Processes in a Low-Density Two-Dimensional Electron Gas: Spin-Dependent Transitions to Higher Hole Landau Levels
Shake-up Processes in a Low-Density Two-Dimensional Electron Gas: Spin-Dependent Transitions to Higher Hole Landau Levels
复制标题
DOI：
10.1103/physrevb.69.115332
复制
发表时间：
2003-09
影响因子：
3.7
通讯作者：
A. Dzyubenko
中科院分区：
文献类型：
--
作者：
A. Dzyubenko
本文提出了强磁场中相互作用低密度二维电子气（2DEG）光吸收的震荡过程理论。在这些过程中，入射光子产生电子-空穴对，并且由于库仑相互作用，同时将一个粒子激发到更高的朗道能级（LL）。在这项工作中，第一空穴LL中的相关带电自旋单重态和自旋三重态电子空穴态的光谱以及到这些状态的光学跃迁（即，研究了第一孔LL的振动。我们的研究结果表明，特别是，存在的光学活性的三粒子准离散态的激子连续体，可能会引起令人惊讶的尖锐的Fano共振在强磁场中。讨论了二维电子气和二维空穴气光吸收中的振荡与孤立的负${X}^{\ensuremath{-}}$和正${X}^{+}$三电子振荡之间的关系。
A theory of shake-up processes in photoabsorption of an interacting low-density two-dimensional electron gas (2DEG) in strong magnetic fields is presented. In these processes, an incident photon creates an electron-hole pair and, because of Coulomb interactions, simultaneously excites one particle to higher Landau levels (LL's). In this work, the spectra of correlated charged spin-singlet and spin-triplet electron-hole states in the first hole LL and optical transitions to these states (i.e., shake ups to the first hole LL) are studied. Our results indicate, in particular, the presence of optically active three-particle quasi discrete states in the exciton continuum that may give rise to surprisingly sharp Fano resonances in strong magnetic fields. The relation between shake ups in photoabsorption of the 2DEG and in the 2D hole gas, and shake-ups of isolated negative ${X}^{\ensuremath{-}}$ and positive ${X}^{+}$ trions are discussed.