Crossed excitons in a semiconductor nanostructure of mixed dimensionality

Journal Article · Mon Sep 08 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4895558· OSTI ID:22310815

Owschimikow, Nina; Kolarczik, Mirco; Kaptan, Yücel I.; Grosse, Nicolai B.; Woggon, Ulrike ^[1]

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1. Institut für Optik und Atomare Physik, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)

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.

• OSTI ID: 22310815
• Journal Information: Applied Physics Letters, Vol. 105, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
AMPLIFIERS
COLOR
EQUILIBRIUM
EXCITATION
EXCITONS
GAIN
GALLIUM ARSENIDES
INDIUM ARSENIDES
NANOSTRUCTURES
QUANTUM DOTS
QUANTUM WELLS
SCATTERING
SEMICONDUCTOR MATERIALS
SPECTRA