Probing indirect exciton complexes in a quantum dot molecule via capacitance-voltage spectroscopy

Capacitance-voltage spectroscopy has proved to be a very powerful experimental technique towards the investigation of carrier-carrier interactions both qualitatively and quantitatively in complex coupled nanostructures. Here, we exploit this method to observe indirect exciton complexes in a quantum...

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Veröffentlicht in:Physical review. B 2016-12, Vol.94 (24), Article 245311
Hauptverfasser: Pal, Shovon, Junggebauer, Clara, Valentin, Sascha R., Eickelmann, Pia, Scholz, Sven, Ludwig, Arne, Wieck, Andreas D.
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Sprache:eng
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Zusammenfassung:Capacitance-voltage spectroscopy has proved to be a very powerful experimental technique towards the investigation of carrier-carrier interactions both qualitatively and quantitatively in complex coupled nanostructures. Here, we exploit this method to observe indirect exciton complexes in a quantum dot molecule and to quantify the electron-hole interactions between two dots in a quantum dot molecule, formed by vertical stacking of self-assembled quantum dot layers. While frequency-dependent measurements distinguish between the s- and p-charging behavior, under perpendicular magnetic fields, reordering of the quantized states charging sequence is observed along with the formation of a Landau fan in the wetting layer that is used to reconstruct the Fermi energy level.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.245311