Electronic Coupling in Nanoscale InAs/GaAs Quantum Dot Pairs Separated by a Thin Ga(Al)As Spacer

The electronic coupling in vertically aligned InAs/GaAs quantum dot (QD) pairs is investigated by photoluminescence (PL) measurements. A thin Al(0.5)Ga(0.5)As barrier greatly changes the energy transfer process and the optical performance of the QD pairs. As a result, the QD PL intensity ratio shows...

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Detalles Bibliográficos
Autores principales: Liu, Yao, Liang, Baolai, Guo, Qinglin, Wang, Shufang, Fu, Guangsheng, Fu, Nian, Wang, Zhiming M, Mazur, Yuriy I, Salamo, Gregory J
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2015
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4489975/
https://www.ncbi.nlm.nih.gov/pubmed/26123271
http://dx.doi.org/10.1186/s11671-015-0973-5
Descripción
Sumario:The electronic coupling in vertically aligned InAs/GaAs quantum dot (QD) pairs is investigated by photoluminescence (PL) measurements. A thin Al(0.5)Ga(0.5)As barrier greatly changes the energy transfer process and the optical performance of the QD pairs. As a result, the QD PL intensity ratio shows different dependence on the intensity and wavelength of the excitation laser. Time-resolved PL measurements give a carrier tunneling time of 380 ps from the seed layer QDs to the top layer QDs while it elongates to 780 ps after inserting the thin Al(0.5)Ga(0.5)As barrier. These results provide useful information for fabrication and investigation of artificial QD molecules for implementing quantum computation applications.

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