STRONG CORRELATION EFFECTS ON PHOTO-EXCITED STATES IN SEMICONDOCTORS

点击翻译按钮获取中文摘要

Metal insulator transition(exciton Mott transition) and quantum condensation transition in photo-excited semiconductors(electron-hole systems) are very important in the field of both fundamental and applied physics. To correctly understand these phase transitions, proper theoretical treatment of many body effects is essential. In this study, we have theoretically investigated the exciton Mott transition in these systems by means of extensions of the dynamical mean field theory(DMFT). The DMFT is powerful methods to analyze the lattice fermion systems. For the electron-hole system with a small number of excited particles, a continuous model is more suitable than a lattice model. Therefore, we have formulated DMFT for a continuous model and combining this method with the exact diagonalization method, we have determined the phase diagram in the electron-hole systems at low density.