2008/04/30 by M. M. Fogler, Sen Yang, A. T. Hammack +2 · 1 citation
Chemistry · Physics and Astronomy · #Atomic physics #Coherence (philosophical gambling strategy) #Coherence length #Coherence time #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Degree of coherence #Diffraction #Exciton #Interferometry #Optics #Physics #Quantum #Quantum mechanics #Quantum optics and atomic interactions #Spectroscopy and Laser Applications #Wavelength #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.78.035411
published as Phys. Rev. B 78, 035411 (2008) · 6 pages, 5 figures
arxiv created 2008/06/07 · openalex publication_date 2008/07/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We evaluate the effect of diffraction-limited resolution of the optical system on the estimates of the coherence length of two-dimensional 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 \ensuremathπ. 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.