Experimental Evidence for the Existence of an Electron-Hole Liquid in II-VI Compounds

Abstract

Measurements of optical absorption and gain in CdS and gain in CdSe show that for high excitation density optically excited carriers form an electron-hole liquid with binding energy of 13 meV for CdS and 2 meV for CdSe. The measurements are compared to a recent theory for electron-hole liquid formation in polar semiconductors.