Phys. Rev. Lett. 97, 096803 (2006) [4 pages]Variable Orbital Coupling in a Two-Dimensional Quantum-Dot Solid Probed on a Local ScaleSee Also: Publisher's Note Received 17 May 2006; published 1 September 2006; corrected 20 October 2006 The optoelectronic properties of semiconductor quantum-dot (QD) solids depend on the electronic structure of the building blocks and their interactions. Disorder may affect the coupling on a local scale. We have measured the density of states of 2D arrays of PbSe QDs site by site using scanning tunneling spectroscopy. It markedly differs from that of isolated QDs due to electronic coupling in the array. We observe strong local variations in the coupling strength with two prototypical cases: delocalization of the conduction electrons only, and full coupling with both hole and electron delocalization over the QD sites in the array. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.096803
DOI:
10.1103/PhysRevLett.97.096803
PACS:
73.22.−f, 73.63.−b, 81.07.−b
See AlsoPublisher's Note: Peter Liljeroth, Karin Overgaag, Ana Urbieta, Bruno Grandidier, Stephen G. Hickey, and Daniël Vanmaekelbergh, Publisher’s Note: Variable Orbital Coupling in a Two-Dimensional Quantum-Dot Solid Probed on a Local Scale [Phys. Rev. Lett. 97, 096803 (2006)], Phys. Rev. Lett. 97, 189901 (2006). |
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