Nano Express

Nanoscale Research Letters

, Volume 5, Issue 6, pp 991-1001

Open Access This content is freely available online to anyone, anywhere at any time.

Cooperative Effects in the Photoluminescence of (In,Ga)As/GaAs Quantum Dot Chain Structures

  • Yu. I. MazurAffiliated withDepartment of Physics, University of Arkansas Email author 
  • , V. G. DoroganAffiliated withDepartment of Physics, University of Arkansas
  • , E. MaregaJrAffiliated withDepartment of Physics, University of Arkansas
  • , D. F. CesarAffiliated withDepartamento de Fisica, Universidade Federal de Sao Carlos
  • , V. Lopez-RichardAffiliated withDepartamento de Fisica, Universidade Federal de Sao Carlos
  • , G. E. MarquesAffiliated withDepartamento de Fisica, Universidade Federal de Sao Carlos
  • , Z. Ya. ZhuchenkoAffiliated withInstitute of Semiconductor Physics, National Academy of Sciences of Ukraine
  • , G. G. TarasovAffiliated withInstitute of Semiconductor Physics, National Academy of Sciences of Ukraine
  • , G. J. SalamoAffiliated withDepartment of Physics, University of Arkansas

Abstract

Multilayer In0.4Ga0.6As/GaAs quantum dot (QD) chain samples are investigated by means of cw and time-resolved photoluminescence (PL) spectroscopy in order to study the peculiarities of interdot coupling in such nanostructures. The temperature dependence of the PL has revealed details of the confinement. Non-thermal carrier distribution through in-chain, interdot wave function coupling is found. The peculiar dependences of the PL decay time on the excitation and detection energies are ascribed to the electronic interdot coupling and the long-range coupling through the radiation field. It is shown that the dependence of the PL decay time on the excitation wavelength is a result of the superradiance effect.

Keywords

Time-resolved photoluminescence Quantum dot chain Interdot coupling