Chapter

Effects of high excitation in low-dimensional structures

Ivan Pelant and Jan Valenta

in Luminescence Spectroscopy of Semiconductors

Published in print February 2012 | ISBN: 9780199588336
Published online May 2012 | e-ISBN: 9780191738548 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199588336.003.0013
Effects of high excitation in low-dimensional structures

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Effects of high excitation in low-dimensional structures are treated in close analogy with bulk semiconductors. The existence of excitonic molecules (biexcitons) and trions (charged excitons) in quantum wells is experimentally evidenced and characteristic emission lineshapes are described theoretically and compared with experiment. Also luminescence due to free exciton collisions can happen in quantum wells. The question of electron–hole liquid occurrence in 2D structures is also addressed; the terms phase space filling, dielectric confinement and Mott transition are invoked. Certain limits for the electron–hole liquid universality in quantum wells are discussed. Controversial data concerning the coexistence of free excitons, biexcitons, trions, electron–hole liquid and electron–hole plasma in quantum wires are commented. High excitation effects in quantum dots are discussed from the point of view of the mean number of electron–hole pairs per nanocrystal.

Keywords: excitonic molecule; trion; emission lineshape; phase space filling; dielectric confinement; electron–hole liquid; electron–hole plasma; mean number of electron–hole pairs

Chapter.  9656 words.  Illustrated.

Subjects: Atomic, Molecular, and Optical Physics

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