Carrier transfer in vertically stacked quantum ring-quantum dot chains

Author(s):Show less -

Mazur, Yu. I. ^[1] ; Lopes-Oliveira, V. ^[2] ; de Souza, L. D. ^{[2, 1]} ; Lopez-Richard, V. ^[2] ; Teodoro, M. D. ^[2] ; Dorogan, V. G. ^[1] ; Benamara, M. ^[1] ; Wu, J. ^[3] ; Tarasov, G. G. ^[4] ; Marega, Jr., E. ^[5] ; Wang, Z. M. ^[3] ; Marques, G. E. ^[2] ; Salamo, G. J. ^[1]

Affiliation

^[1] Univ Arkansas, Arkansas Inst Nanoscale Mat Sci & Engn, Fayetteville, AR 72701 - USA

^[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Elect Sci & Technol China, State Key Lab Elect Thin Film & Integrated Device, Chengdu 610054 - Peoples R China

^[4] Natl Acad Sci, Inst Semicond Phys, UA-03028 Kiev - Ukraine

^[5] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Applied Physics; v. 117, n. 15 APR 21 2015.
• Web of Science Citations: 8

Abstract

The interplay between structural properties and charge transfer in self-assembled quantum ring (QR) chains grown by molecular beam epitaxy on top of an InGaAs/GaAs quantum dot (QD) superlattice template is analyzed and characterized. The QDs and QRs are vertically stacked and laterally coupled as well as aligned within each layer due to the strain field distributions that governs the ordering. The strong interdot coupling influences the carrier transfer both along as well as between chains in the ring layer and dot template structures. A qualitative contrast between different dynamic models has been developed. By combining temperature and excitation intensity effects, the tuning of the photoluminescence gain for either the QR or the QD mode is attained. The information obtained here about relaxation parameters, energy scheme, interlayer and interdot coupling resulting in creation of 1D structures is very important for the usage of such specific QR-QD systems for applied purposes such as lasing, detection, and energy-harvesting technology of future solar panels. (C) 2015 AIP Publishing LLC. (AU)

• FAPESP's process: 13/18719-1 - Electronic carriers dynamics in semiconductor nanostructures
• Grantee: Marcio Daldin Teodoro
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 12/02655-1 - Nanooptical systems and nanoelectronic devices
• Grantee: Victor Lopez Richard
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/07375-2 - Multi-user equipment approved in grant 2013/18719-1: time resolved measurement system
• Grantee: Marcio Daldin Teodoro
• Support Opportunities: Multi-user Equipment Program