Intersubband Transitions in Spherical Quantum Dot Quantum Well Nanoparticle
Optical and quantum electronics(2020)
摘要
In this paper, we present the results of our investigation of the electronic spectra and optical properties of one-electron spherical quantum dot–quantum well (QDQW) structure. The investigated QDQW system consists of a CdSe core surrounded by a ZnS shell and a CdSe shell and capped by material of a very high electron potential barrier compared to CdSe, i.e. CdSe/ZnS/CdSe structure. Eigenenergies and corresponding wave functions were calculated by the effective mass approximation. We focused on the one-electron ground state (1s) and the first three excited states. For the allowed transitions, we have calculated the linear and third-order nonlinear intersubband optical absorption coefficients for various structures, i.e. different CdSe core radii, ZnS shell (barrier) widths and CdSe shell widths. A change in the core and shells dimensions induces a change in the electron wave function, followed by a significant change in the energy of state. As a result, the optical properties of this system are strongly dependent on the QDQW structure.
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关键词
Quantum dot,Core-shell nanostructure,Absorption,Oscillator strength,Interlevel transitions
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