Abstract
A broadening of both the recombination luminescence and absorption spectra of indirect excitons in Ge is observed. This broadening is found to be density dependent consistent with an exciton-exciton collision process. An effective exciton collision radius of 220 80 is measured in agreement with theoretical estimates. Density-modulated absorption spectra also indicate an apparent red shift of the exciton energy at high carrier densities. A detailed analysis of the exciton line shape leads to a better understanding of the thermodynamics of the coexisting electron-hole liquid and exciton gas, provides improved values of the binding energy, =1.80.2 meV, and the ground-state energy per pair, EG=-5.90.3 meV, and gives the most nearly complete description of the gas-liquid phase boundary. The complications due to density gradients which arise from surface excitation with be briefly discussed.
Original language | English (US) |
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Pages (from-to) | 1692-1702 |
Number of pages | 11 |
Journal | Physical Review B |
Volume | 13 |
Issue number | 4 |
DOIs | |
State | Published - 1976 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics