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Extremely uniform bound exciton states in nitrogen δ-doped GaAs studied by photoluminescence spectroscopy in external magnetic fields
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10.1063/1.3654015
/content/aip/journal/jap/110/8/10.1063/1.3654015
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3654015
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Figures

Image of FIG. 1.
FIG. 1.

(a) Typical macro-PL spectrum of N δ-doped GaAs at T = 3.2 K and P exc = 0.06 W/cm2. (b) and (c) are exciton fine structure of the 1.444- and 1.493-eV lines, respectively, for different observation area at T = 4.4 K and P exc = 0.5 W/cm2. The N-pair numbers estimated by the PL imaging measurement were 600, 20, 3, and 1 from the top spectrum.

Image of FIG. 2.
FIG. 2.

(Color online) Linearly polarized magneto-PL spectra for the (a) 1.444- and (b) 1.493-eV lines, respectively, at T = 4.4 K and P exc = 0.34 W/cm2. The magnetic field was applied along [001] in the Faraday configuration. The solid and dotted lines are the results for the [110] and [–110] polarizations, respectively. The bottom panels show the magnetic-field evolution of the PL-peak energy. The solid and open circles are the PL lines observed for the [110] and [−110] polarizations, respectively, at the zero magnetic field. The squares are unexpected PL lines in the C 2 symmetry in the [110] direction.

Image of FIG. 3.
FIG. 3.

(Color online) Magnetic field evolution of the average energy, ΔE ave, of the 1.444- and 1.493-eV lines. ΔE ave was defined by the average energy of the exciton fine structure indicated by the solid and open circles in Fig. 2. The circles and squares are the results for the 1.444- and 1.493-eV lines, respectively.

Image of FIG. 4.
FIG. 4.

(Color online) PL decay dynamics of the 1.444- and 1.493-eV lines at T = 4.4 K and P exc = 0.007 W/cm2. The circles and squares are the results for the 1.444- and 1.493-eV lines, respectively. The dotted curve indicates the laser profile. The profiles have been normalized by the intensity at 0 ns.

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/content/aip/journal/jap/110/8/10.1063/1.3654015
2011-10-24
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Extremely uniform bound exciton states in nitrogen δ-doped GaAs studied by photoluminescence spectroscopy in external magnetic fields
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3654015
10.1063/1.3654015
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