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Physical Review B
Photoluminescence measurements have been performed at low temperature on crystalline Si/ SiO 2 quantum wells as a function of thickness. Three distinct electron-hole ͑e-h͒ phases are clearly identified in these structures: the electron-hole liquid, the electron-hole plasma, and the free-exciton gas. It is shown that spatial confinement induced by the SiO 2 barriers modifies the thermodynamical equilibrium between these phases with respect to the bulk case by changing the steady state of thedoi:10.1103/physrevb.72.205324 fatcat:pencnugttrhb3be2uiaid346pq