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Magnetic-field-dependent type-II transition induced by resonant electron tunneling from a diluted magnetic semiconductor quantum well into self-assembled quantum dots
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10.1063/1.2360779
/content/aip/journal/jap/100/8/10.1063/1.2360779
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/8/10.1063/1.2360779
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic drawing of a coupled CdSe-QD structure with a MW of .

Image of FIG. 2.
FIG. 2.

Circularly polarized (: a solid line, : a broken line) cw-PL spectra and the circular polarization degree (a closed circle) at in a single SAQD layer (a), nonresonantly coupled SAQDs (b), and resonantly coupled SAQDs (c), respectively. Spectral peaks due to a direct exciton in the MW , a type-II transition , and a QD emission band are shown by arrows in the resonant sample.

Image of FIG. 3.
FIG. 3.

-polarized excitonic PL spectrum at in the resonantly coupled QD structure with MW, where the spectrum was time integrated in the region from using a streak camera. The exciton PL spectra of the MW and QDs are shown by solid lines. The PL component due to the type-II transition is shown by a broken line.

Image of FIG. 4.
FIG. 4.

Time dependences of (a thick line)- and (a thin line)-polarized PL intensities and the circular polarization degree (a solid circle) at in the resonantly coupled QD structure, for the PL-energy range of corresponding to the type-II transition. The value is defined as with the circularly polarized PL intensities, and .

Image of FIG. 5.
FIG. 5.

(an open circle)- and (an open square)-polarized PL intensities and the circular polarization degree (a solid circle) as a function of time, in the single QD layer. The solid lines are fitted calculations using rate equations.

Image of FIG. 6.
FIG. 6.

PL-peak energies of direct excitons in the MW (a solid square) and in indirect excitons (a solid circle) as a function of magnetic field (a). The QD spectral band is also shown by a dotted line. A fitted calculation for the direct exciton energy in the MW using a Brillouin function is shown as a function of magnetic field by a solid line. The energy with the decrement of 1-LO-phonon energy from the Brillouin fitting is also shown by a broken line. The calculated electron and hh energies in the MW as a function of magnetic field (b), where the origin of the vertical axis is set to be 0 at the top of valence band of bulk CdSe.

Image of FIG. 7.
FIG. 7.

Schematic band alignment of the resonantly coupled QD structure with MW at , where the electron energy in the QD is assumed to be 1-LO-phonon-energy lower than the down-spin-electron level in the MW. Related carrier-spin dynamics and the type-II transition are also illustrated.

Image of FIG. 8.
FIG. 8.

Time-resolved excitonic PL spectra integrated with the time window of , as a function of magnetic field. The type-II transition is shown to appear at .

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/content/aip/journal/jap/100/8/10.1063/1.2360779
2006-10-30
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic-field-dependent type-II transition induced by resonant electron tunneling from a diluted magnetic semiconductor quantum well into self-assembled quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/8/10.1063/1.2360779
10.1063/1.2360779
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