On the Possible Influence of the Mosaic Structure of by Zwicky F. PDF

By Zwicky F.

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Extra resources for On the Possible Influence of the Mosaic Structure of Crystals on the Determination of Avogadros Number

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Let us first fix the value Q and seek the energy minimum of an array of equally sized islands. Then, instead of minimizing the total energy, one can seek the minimum energy per atom in the islands. Take, for simplicity, the islands having a shape of a square-based pyramid with the tilt angle of side facets ϑ0 and focus on the energy per atom as the function of the island base length L, E(L) [39] E(L) = Ω −f1 (θ0 )λε20 + (6 cot θ0 )1/3 × f2 (θ0 )τ 2 ln λL2 L 2πa (ΔΓ ) − (6 cot θ0 )2/3 L + (6 cot θ0 )2/3 f3 (θ0 )η .

Schematics of the exciton wavefunction engineering by stacking QDs. a Sheets of QDs are separated by thick spacers, so that the dots are electronically not coupled. Wavefunction of an exciton localized by QDs roughly follows the shape of the QD and is extended in the lateral plane. Edge photoluminescence (PL) is transverse electric or TE-polarized. b Sheets of QDs are separated by thin spacers, QDs are electronically coupled, and edge PL is transverse magnetic or TM-polarized. Dashed lines show schematically exciton wavefunctions In distribution.

34] and realized by Ledentsov et al. [35] for a CdSe/ZnSe superlattice. A strong refractive index modulation near the optical absorption peak may effectively confine an optical wave without the need for a conventional waveguide. 5. The high exciton absorption coefficients in QDs convert to ultrahigh exciton/biexciton gain coefficients at high excitation densities, since no screening of excitons occurs. This allows lasing for very short cavity lengths in edge geometry, or enables surface lasing in vertical geometry even if no highly reflecting Bragg mirrors are used.

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