Article

Applied Physics B

, Volume 103, Issue 1, pp 189-194

First online:

Parameter-dependent optical nutation in PbSe/CdSe/ZnS quantum-dot

  • X. Z. GuoAffiliated withDepartment of Physics, Wuhan University
  • , G. G. XiongAffiliated withDepartment of Physics, Wuhan UniversityKey Laboratory of Acoustic and Photonics Material and Devices, Ministry of Education, Wuhan University Email author 
  • , Q. Q. XuAffiliated withDepartment of Physics, Wuhan University
  • , M. XiaoAffiliated withDepartment of Physics, Wuhan University
  • , D. Z. YaoAffiliated withDepartment of Physics, Wuhan UniversityKey Laboratory of Acoustic and Photonics Material and Devices, Ministry of Education, Wuhan University Email author 

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Abstract

The eigenenergies and eigenfunctions of the spherical PbSe/CdSe/ZnS quantum-dot with the core-shell-shell structure and the electric dipole moment between the a 1s state (the lowest state of the system) and b 1p state (the lowest p state above the first potential) have been calculated by using the rotational wave approximation and the effective mass approximation. The optical nutation signal induced by the transition between these two energy levels has been calculated based on the optical Bloch equations. In particular, the influence of the core’s radius increasing and the CdSe shell’s thickness increasing has been investigated respectively. It is shown from the numerical calculation results that the optical nutation signals are dependent on the size and the structure of the quantum-dot. Moreover, the quantum size-dependent Rabi frequency has been analyzed.