Collective radiance in semiconductor nanostructures
by
Alexander N. Poddubny, Ioffe Physical-Technical Institute, St. Petersburg, Russia
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Europe/Berlin
Bldg. 25b, room 109
Bldg. 25b, room 109
Description
The study of optical properties of semiconductor nanostructures is a rapidly developing area in modern solid state physics. Effective interaction between photon modes and excitons (electron–hole excitations) can be attained, allowing to achieve an effective control of light emission and study quantum electrodynamics in the solid state system.
This talk is focused on the nanostructures with several emitters, either quantum dots (artificial atoms) or quantum wells. Semiconductors excitons in different dots or wells are efficiently coupled by light so that the collective half-light half-matter excitations, termed as excitonic polaritons, are formed. In particular, light propagation in three-dimensional periodic lattice of quantum dots is addressed [1]. Emission spectra of the microcavity where the photon trapped in all three dimensions interacts with quantum-dot excitons are also discussed [2]. Special attention is paid to the one-dimensional deterministic nonperiodic arrays of quantum wells, proposed recently [3-5]. Example of such object is Fibonacci quasicrystalline sequence, where the spacings between two adjacent wells take one of the two values, A or B, and are arranged in Fibonacci sequence ABAABABAABAAB... Optical spectra of these structures reveal an interplay between superradiant and photonic-quasicrystalline regimes and also demonstrate scaling and self-similarity effects. General analytical theory of optical spectra is confirmed by the results of experiments [4].
[1] E.L. Ivchenko, A.N. Poddubny, Phys. Solid State, 48, 581 (2006).
[2] N. S. Averkiev, M. M. Glazov, and A. N. Poddubny, JETP 108, 836 (2009).
[3] A.N. Poddubny, L. Pilozzi, M. M. Voronov, and E. L. Ivchenko, Phys. Rev. B 77, 113306 (2008).
[4] J. Hendrickson, B. C. Richards, J. Sweet, G. Khitrova, A. N. Poddubny, E. L. Ivchenko, M. Wegener, and H. M. Gibbs, Opt. Express 16 15382-15387 (2008).
[5] A.N. Poddubny, L. Pilozzi, L., M.M. Voronov, and E.L. Ivchenko, Phys. Rev. B 80, 115314 (2009).
