2003/09/30 by A. B. Dzyubenko
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.69.115332
8 pages, 8 figures. References updated, one figure added (Fig. 6). Accepted in Phys. Rev. B
arxiv created 2004/02/06 · openalex publication_date 2004/03/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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.