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Quantum-confined direct-gap transitions in tensile-strained Ge/SiGe multiple quantum wells
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10.1063/1.3606383
/content/aip/journal/apl/99/3/10.1063/1.3606383
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/3/10.1063/1.3606383
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Brewster-geometry transmission spectrum of the as-prepared sample, and the first-derivative spectra on the RTA series. The line-shape is fitted to a qualitative model to extract the MQW1 and MQW2 transition energies. (b) PR-spectrum of the as-prepared sample, clearly resolving individual light/heavy-hole transitions in MQW1 and MQW2. The PR-spectrum is fit with a TDFF model to extract the LH/HH transition energies.

Image of FIG. 2.
FIG. 2.

(Color online) (a) LH-HH splitting from transmission and PR data, and the corresponding biaxial strain of the VS, as a function of RTA time and temperature. (b) Transmission and PR determinations of MQW1 (LH1/HH1-cΓ1) and MQW2 (LH2/HH2-cΓ2) transition energies, as a function of 30 s RTA. (c) TB calculations of the LH1/HH1-cΓ1 and LH2/HH2-cΓ2 transitions, taking the linear diffusion-constant from (i) the literature and (ii) our own XRD determination.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Absorption strength of the MQW1 and MQW2 transitions, as determined from the transmission spectra. (b) The inverse transition broadening of the LH1/HH1-cΓ1 and LH2/HH2-cΓ2 transitions, as calculated from the TB model taking the linear diffusion-constant from our own XRD determination.

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/content/aip/journal/apl/99/3/10.1063/1.3606383
2011-07-22
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quantum-confined direct-gap transitions in tensile-strained Ge/SiGe multiple quantum wells
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/3/10.1063/1.3606383
10.1063/1.3606383
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