Continuum transitions and phonon coupling in single self-assembled Stranski-Krastanow quantum dots

Physical Review B - Condensed Matter and Materials Physics

Volumn 68, Issue 23, 2003, Pages

  Oulton, R ^a   Finley, J J ^a,b   Tartakovskii, A I ^a   Mowbray, D J ^a   Skolnick, M S ^a   Hopkinson, M ^a   Vasanelli, A ^c   Ferreira, R ^c   Bastard, G ^c  

^a UNIVERSITY OF SHEFFIELD   (United Kingdom)

^b WALTER SCHOTTKY INSTITUT   (Germany)

^c ECOLE NORMALE SUPÉRIEURE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

GALLIUM ARSENIDE; INDIUM; INDIUM GALLIUM ARSENIDE; UNCLASSIFIED DRUG;

ABSORPTION SPECTROSCOPY; ARTICLE; ATOM; ELECTRIC FIELD; ENERGY; PHONON; PHOTOLUMINESCENCE; QUANTUM MECHANICS; QUANTUM THEORY; SEMICONDUCTOR; TEMPERATURE;

EID: 0842321043     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.68.235301     Document Type: Article

References (26)

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13. Similar transitions for quantum wells have been reported by M.S. Skolnick, P.R. Tapster, S.J. Bass, A.D. Pitt, N. Apsley, and S.P. Aldred, Semicond. Sci. Technol. 1, 29 (1986).
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15. P.W. Fry, I.E. Itskevich, S.R. Parnell, J.J. Finley, L.R. Wilson, K.L. Schumacher, D.J. Mowbray, M.S. Skolnick, M. Al-Khafaji, A.G. Cullis, M. Hopkinson, J.C. Clark, and G. Hill, Phys. Rev. B 62, 16 784 (2000).
16. R. Ferreira and G. Bastard, Appl. Phys. Lett. 74, 2818 (1999).
17. Marked increase of linewidth with temperature was observed in PLE in Ref. 11, and was attributed to coupling to continuum states.
18. A.F. Tsatsulnikov, A.R. Kovsh, A.E. Zhukov, Y.M. Shernyakov, Y.G. Musikhin, V.M. Ustinov, N.A. Bert, P.S. Kop’ev, Zh.I. Alferov, A.M. Mintairov, J.L. Merz, N.N. Ledentsov, and D. Bimberg, J. Appl. Phys. 88, 6272 (2000).
19. Absorption (PLE) spectra with sharp transitions but no continuum have been reported by P. Hawrylak, G.A. Narvaez, M. Bayer, and A. Forchel, Phys. Rev. Lett. 85, 389 (2000).
20. This may arise from the “In-flush-annealing” growth technique [S. Fafard, Z.R. Wasilewski, C. Ni. Allen, D. Picard, M. Spanner, J.P. McCaffrey, and P.G. Piva, Phys. Rev. B 59, 15 368 (1999)], possibly leading to reduction of the amount of In in the WL.
21. A broad background signal is seen in PC from 1200 to 1400 meV, probably arising from absorption of scattered laser light by the ensemble of dots. Field modulation techniques (ΔV = 10 mV, 1.6 kHz), sensitive only to field-dependent features, were employed, enabling the background to be eliminated. Lock-in detection leads to the differential spectra of Fig. 22.
22. Very similar sharp line structure is seen for dots 2 and 3 (Fig. 33). For dot 3 however, the 15–25 meV features are much weaker relative to the higher-energy lines, supporting a perturbation origin for the observation of the nominally forbidden e1 − h2, e1 − h3 lines. The cylindrical symmetry assumed in the theory accounts for the relatively small number of discrete lines in the theory spectra.
23. See, e.g., M. Grundmann, O. Stier, and D. Bimberg, Phys. Rev. B 52, 11 969 (1995).
24. O. Verzelen, R. Ferreira, and G. Bastard, Phys. Rev. Lett. 88, 146803 (2002).
25. O. Verzelen, G. Bastard, and R. Ferreira, Phys. Rev. B 66, 081308 (2002).
26. The polaron splitting for the |e1 − h1, 1LO〉, |e2 − h2〉 resonance is only expected to be ∼0.1 meV due to the similar polarisation charges for electron and hole states of the same symmetry.