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Exciton confinement and trapping dynamics in double-graded-bandgap quantum nanowires
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic illustration of the double-graded QWR structure. (b) Calculated absorption spectrum indicating the light- (lh) and heavy-hole (hh) components for different electron-hole (ei-hj) transitions; arrows indicate transitions with the largest dipole matrix element. (c) Conduction (CB) and valence band (VB) edge profiles along the QWR axis (growth direction) and calculated probability densities for the confined electron and hole states involved in the transitions GS-E5. (d) Polarization-resolved side-view PL of sample A and extracted degree of linear polarization P = (I|| − I)/(I|| + I). Arrows indicate calculated transitions rigidly red-shifted by 12 meV.

Image of FIG. 2.
FIG. 2.

(a) Spectrally and temporally resolved PL of the double-graded QWR (sample A), T = 10 K, top-view excitation geometry. (b) PL spectra at different delay times after the laser pulse.

Image of FIG. 3.
FIG. 3.

(a) PL intensity of the spectral peaks of the double-graded QWR structure A at different delay times (symbols) and fits with Fermi-Dirac function (solid lines). (b) Chemical potential (circles) and temperature (squares) of the carrier population obtained from the Fermi-Dirac fits versus delay time. Emission energies of the peaks are marked as horizontal lines.

Image of FIG. 4.
FIG. 4.

(a) Second-order correlation function for photons emitted from the single-exciton ground state (X-X). (b) Spectrally and temporally resolved PL of the ground state with exciton (X) and biexciton (2X) emission lines. (c) Auto- and cross-correlations of photons emitted from different exciton states. All data shown for sample B.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Exciton confinement and trapping dynamics in double-graded-bandgap quantum nanowires