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Title: Crossed excitons in a semiconductor nanostructure of mixed dimensionality

Semiconductor systems of reduced dimensionality, e.g., quantum dots or quantum wells, display a characteristic spectrum of confined excitons. Combining several of these systems may lead to the formation of “crossed” excitons, and thus new equilibrium states and scattering channels. We derive gain excitation spectra from two-color pump-probe experiments on an In(Ga)As based quantum dot semiconductor optical amplifier by analyzing the amplitudes of the traces. This grants access to the quantum dot response, even in the presence of strong absorption by the surroundings at the excitation energy. The gain excitation spectra yield evidence of crossed quantum dot-bulk states.
Authors:
; ; ; ;  [1]
  1. Institut für Optik und Atomare Physik, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)
Publication Date:
OSTI Identifier:
22310815
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; AMPLIFIERS; COLOR; EQUILIBRIUM; EXCITATION; EXCITONS; GAIN; GALLIUM ARSENIDES; INDIUM ARSENIDES; NANOSTRUCTURES; QUANTUM DOTS; QUANTUM WELLS; SCATTERING; SEMICONDUCTOR MATERIALS; SPECTRA