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|Title:||Hyperfine splitting and quantum beats in CdSe quantum dots|
Sen, Pranay K
|Abstract:||The occurrence of quantum beat phenomena in CdSe quantum dots (QD) has been explained on the basis of hyperfine splitting of the excitons. The spin degeneracy of the conduction electrons is lifted by the magnetic field arising due to hole spin. The interaction of the coherent linearly polarized light with a quantum dot has been described by a V-type transition in which the two excited states are formed by the spin-split energies of the conduction band electrons while ground state is the hole state. The output radiation corresponding to each of the transitions will have polarization states characteristic of the |± 1/2)-state of the electrons in the conduction band. Accordingly, in a time resolved measurement at a specific analyzer axis, the interference and consequent beating of the signal is expected to occur. The spin states of the excitons in a quantum dot have been analyzed using Dirac’s relativistic wave equation. The results are found to be in good agreement with the reported experimental observations.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.44(02) [February 2006]|
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