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Volumn 69, Issue 20, 2004, Pages

Optical dephasing of coherent intersubband transitions in a quasi-two-dimensional electron gas

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION SPECTROSCOPY; ARTICLE; DENSITY; ELECTRON; GAS; LIGHT SCATTERING; PHONON; POLARIZATION; QUANTUM MECHANICS; QUANTUM THEORY; SEMICONDUCTOR;

EID: 42749106161     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.69.205307     Document Type: Article
Times cited : (90)

References (37)
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    • M. Lindberg and S.W. Koch, Phys. Rev. B 38, 3342 (1988); F. Rossi, S. Haas, and T. Kuhn, Phys. Rev. Lett. 72, 152 (1994); F. Jahnke, M. Kira, S.W. Koch, G. Khitrova, E.K. Lindmark, T.R. Nelson, Jr., D.V. Wick, J.D. Berger, O. Lyngnes, H.M. Gibbs, K. Tai, ibid. 77, 5257 (1996); S. Hughes, A. Knorr, S.W. Koch, R. Binder, R. Indik, and JV. Moloney, Solid State Commun. 100, 555 (1996).
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    • In general, the linewidth is influenced both by intrinsic dephasing processes of the coherent IS polarization and by imperfections of the actual sample like alloy disorder, well width fluctuations, and interface roughness. Because of the high perfection of the growth techniques used, especially molecular-beam epitaxy, today's high-quality samples have only very small structural inhomogeneities with a negligible influence on the linewidth. Since the theoretical results are compared with experiments on such high-quality samples, we do not include scattering due to interface roughness and impurities here. For the sample used in the experiment (sample A), time-resolved four-wave mixing measurements [R.A. Kaindl, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, Phys. Rev. B 63, 161308 (2001)] have shown that inhomogeneous broadening has a negligible influence.
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    • Kluwer/Plenum, New York
    • s is a measure of the electron separation. [See G. Mahan, Many-particle Physics, 3rd ed. (Kluwer/Plenum, New York, 2000), p. 296.] For this reason, the RPA is often said to hold only at high densities. However, at high temperatures the kinetic energy increases, and the validity of the RPA extends to low densities. [H. Haug and S. Schmitt-Rink, Prog. Quantum Electron. 9, 3 (1984), p. 35].
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    • s is a measure of the electron separation. [See G. Mahan, Many-particle Physics, 3rd ed. (Kluwer/Plenum, New York, 2000), p. 296.] For this reason, the RPA is often said to hold only at high densities. However, at high temperatures the kinetic energy increases, and the validity of the RPA extends to low densities. [H. Haug and S. Schmitt-Rink, Prog. Quantum Electron. 9, 3 (1984), p. 35].
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