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Effect of spatial resolution on the estimates of the coherence length of excitons in quantum wells
- Source :
- Physical Review B. 78
- Publication Year :
- 2008
- Publisher :
- American Physical Society (APS), 2008.
-
Abstract
- We evaluate the effect of diffraction-limited resolution of the optical system on the estimates of the coherence length of 2D excitons deduced from the interferometric study of the exciton emission. The results are applied for refining our earlier estimates of the coherence length of a cold gas of indirect excitons in coupled quantum wells [S. Yang et al., Phys. Rev. Lett. 97, 187402(2006)]. We show that the apparent coherence length is well approximated by the quadratic sum of the actual exciton coherence length and the diffraction correction given by the conventional Abbe limit divided by 3.14. In practice, accounting for diffraction is necessary only when the coherence length is smaller than about one wavelength. The earlier conclusions regarding the strong enhancement of the exciton coherence length at low temperatures remain intact.<br />Comment: 6 pages, 5 figures
- Subjects :
- Condensed Matter::Quantum Gases
Physics
Diffraction
Coherence time
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed Matter::Other
Exciton
FOS: Physical sciences
02 engineering and technology
Degree of coherence
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
Coherence length
Interferometry
Quantum mechanics
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
010306 general physics
0210 nano-technology
Quantum well
Coherence (physics)
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 78
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....dde54db68f765243bb9af36a2d7b2094