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Spatially Resolved Thermodynamics of the Partially Ionized Exciton Gas in GaAs
- Source :
- Physical review letters. 114(22)
- Publication Year :
- 2015
-
Abstract
- We report on the observation of macroscopic free exciton photoluminescence (PL) rings that appear in spatially resolved PL images obtained on a high purity GaAs sample. We demonstrate that a spatial temperature gradient in the photocarrier system, which is due to nonresonant optical excitation, locally modifies the population balance between free excitons and the uncorrelated electron-hole plasma described by the Saha equation and accounts for the experimentally observed nontrivial PL profiles. The exciton ring formation is a particularly instructive manifestation of the spatially dependent thermodynamics of a partially ionized exciton gas in a bulk semiconductor.
- Subjects :
- education.field_of_study
Photoluminescence
Materials science
Condensed Matter::Other
business.industry
Exciton
Population
General Physics and Astronomy
Thermodynamics
Plasma
Saha ionization equation
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter::Materials Science
Semiconductor
Ionization
Atomic physics
education
business
Excitation
Subjects
Details
- ISSN :
- 10797114
- Volume :
- 114
- Issue :
- 22
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....e21a00a973b53a4f1e336aaceec1cd19