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Exciton fine structure splitting in dot-in-a-well structures
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic diagram of the QD exciton states for the cases of a confining potential of high (left) and low (right) symmetries. ∣0⟩, ∣↑⟩, and ∣↓⟩ denote the initial photon and spin-up and -down exciton states, respectively. The fine structure splitting of the linearly polarized eigenstates in the low symmetry case is denoted . denotes the exciton energy. (b) Schematic diagram of a DWELL structure. The thicknesses of the strained buffer layer and strain reducing layer are denoted by and , respectively.

Image of FIG. 2.
FIG. 2.

(a) PL spectra of the DWELL samples of set A with , and differing In concentration in the well. (b) Differential transmission curves measured in the copolarized pump-probe configuration for the samples of set A with 15% (symbols) and 6% (line) In in the well. (c) The symbols show the data for the sample with 15% with the exponential decay (due to exciton recombination) subtracted. The solid line is the fit using the equation given in the text.

Image of FIG. 3.
FIG. 3.

Dependence of the fine structure splitting (a) and PL peak wavelength (b) on In concentration in the well for the samples of set A. Triangles show data for an additionally grown sample with 15% In in the well and and . (c) and (d) show the dependences of the fine structure splitting and PL peak wavelength on for the samples of set B. (e) shows data from (a)–(d) plotted as vs the emission wavelength [the same symbols as in (a)–(d) are used]. Squares show data from Ref. 6 for annealed dots.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Exciton fine structure splitting in dot-in-a-well structures