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Branislav Vlahovic

Branislav Vlahovic

North Carolina Central University, USA

Title: Optical sensing for dynamics of the localized/delocalized states in binary quantum

Biography

Biography: Branislav Vlahovic

Abstract

Weakly coupled binary nano-sized systems demonstrate perspectives for nano-sensor applications. We study electron/hole localization and spectral distributions of localized/delocalized states in binary InAs/GaAs quantum complexes, including quantum wells (QWs) and quantum dots (QDs). The InAs/GaAs heterostructures are described using the effective potential model. It was shown, that the electron tunneling and spectral distributions of localized/delocalized states in binary system is extremely sensitive on shape symmetry violations. The parameter, which defines delocalized () or localized (0) states of an electron, depends on the energy difference  of the spectra in left and right QDs. The difference can be caused by a shape symmetry violation. The sensitivity of the parameter  to the small variations of  is estimated as          . This work focuses on the optical registration of the localized/delocalized states dynamics. Modeling of carrier transfer from a barrier in InAs/GaAs dot-well, tunnel-injection structure is performed. In Fig 1, shown is the electron wave functions of the localized and delocalized states calculated for two spectral levels: E=0.345 eV and E=0.444 eV, respectively. The energy of the delocalized state corresponds to that one for which the tunneling between dot and well occurs. The relation to the PL experiments for such complexes is provided. We model the second pick of the PL spectrum, which corresponds to the carriers tunneling in the dot-well complex, in the terms of the localized/delocalized states. Influence of the variations of geometrical parameters of QD and QW on the tunneling will be presented.

Recent Publications

  1. Filikhin I, Karoui A and Vlahovic B (2016) Nanosensing Backed by the Uncertainty Principle. Journal of Nanotechnology. doi:10.1155/2016/3794109.
  1. Filikhin I, Suslov V M and Vlahovic B (2006) Modeling of InAs/GaAs quantum ring capacitance spectroscopy in the nonparabolic approximation. Phys. Rev. B 73: 205332-4.
  1. Filikhin I, Matinyan S G and Vlahovic B (2015) Electronic structure of quantum dots and rings. Reviews in Theoretical Science 3: 1-22.
  1. Filikhin I, Karoui A and B. Vlahovic B (2016) Single electron tunneling in double and triple quantum wells. International Journal of Modern Physics B 30: 1642011-9.
  1. Filikhin I, Matinyan S G and Vlahovic B (2015) Localized-delocalized states and tunneling in double quantum dots: effect of symmetry violation. Quantum Matter 4: 1-7.