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Volumn 42, Issue 12, 1990, Pages 7434-7438

Dynamics of exciton formation and relaxation in GaAs quantum wells

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EID: 0001577285     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.42.7434     Document Type: Article
Times cited : (259)

References (18)
  • 11
    • 84927325501 scopus 로고    scopus 로고
    • The wave vector of the incident exciting photon is perpendicular and that of the emitted photon is nearly perpendicular to the quantum-well plane. Therefore, the electron-hole pairs are created with the total in-plane mometum K=0 and only K=0 excitons emit light.
  • 12
    • 84927325500 scopus 로고    scopus 로고
    • For a photon propagating normal to the quantum-well plane, the relative wave vector k of the photoexcited pair is the same as ke and will have an uncertainty related to the spectral width of the excitation pulse. From the uncertainty principle, we estimate that the spatial extent of the electron-hole wave packet varies from about 200 to 600 Å for the excitation energies used in our experiment. If there are frequent long-range Coulomb collisions, then the excitons will be created from the geminate pair and there will be no triplet excitons. For less-frequent collisions, a rapidly moving electron will go away from its geminate hole, excitons can be formed from nongeminate pairs, and triplet states may play an important role.
  • 13
    • 84927325499 scopus 로고    scopus 로고
    • An electron-hole pair can form an exciton without losing any energy; however, such an exciton can autoionize just as easily. We therefore consider only those excitons whose kinetic energy is less than the exciton binding energy.
  • 15
    • 84927325498 scopus 로고    scopus 로고
    • Note that holes are less effective in broadening exciton since GAMMA is inversely proportional to the carrier mass.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.