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Physical Review B
Volumn 43, Issue 15, 1991, Pages 12564-12570
Measurement of the exciton-formation time and the electron- and hole-tunneling times in a double-quantum-well structure
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EID: 0000542432     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.43.12564     Document Type: Article
Times cited : (66)
References (18)
  • 5
    • 84926600853 scopus 로고    scopus 로고
    • K. Leo, J. Shah, J. P. Gorden, T. C. Damen, D. A. B. Miller, C. W. Tu, J. E. Cunningham, and J. E. Henry, Proceedings of the SPIE Conference, San Diego, California, 1990 (unpublished).
  • 6
    • 84926533318 scopus 로고    scopus 로고
    • M. Nido, M. G. W. Alexander, W. W. Rühle, and K. Köhler, Proceedings of the SPIE Conference, Den Haag, Netherlands, 1990 (unpublished).
  • 14
    • 84926581724 scopus 로고    scopus 로고
    • In the absence of tunneling, for a delta-like excitation pulse and assuming τLT is much longer than the exciton-formation time, Eqs. (1)–(3) become dn/dt =dp/dt= - Cn2= -dN/dt, giving n(t)=nex[1/(1+Cnext )], from which the exciton-formation time is obtained as defined.
  • 16
    • 84926536937 scopus 로고    scopus 로고
    • For the sake of completeness, should be noted that in the case of the wide well of the narrow barrier sample, a tiny nonlinearity variation (gradient less than 1) should exist because the increase in the radiative emission of the narrow well with nex slightly deprives the wide well of carriers from the narrow well. However, the relative magnitude of the narrow and wide well PL shown in Fig. 4 indicates that even at the highest excitation densities, the overwhelming majority of the free carriers and excitonic carriers in the narrow well tunnel to the wide well before recombining and therefore the deviation from a gradient of 1 (less than 1%) is too small to be measured in the integrated luminescence measurement or using the cross-correlation technique.

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