999 research outputs found
Probing quantum nanostructures with near-field optical microscopy and (vice versa)
A theory is presented to show how near-field optical microscopy can be used
to probe quantum nanostructures. Calculations are done for a quantum dot.
Results for different tip/dot configurations and sizes show that near-field
excitation can enhance light-hole transitions, excite selection-rule breaking
transitions with rates comparable to allowed transitions, and map electron-hole
pair wave functions. Conversely, dot response can be used to characterize tip
near-fields.Comment: 8 pages of ReVTex, 5 ps figures, submitted to Appl. Phys. Let
On some new simple perfect squared squares
AbstractTransformation techniques due to Federico and Willcocks are applied to obtain the first known simple perfect squared square of order 24 from Duijvestijn's computer results for lower order. Similarly, twelve new simple squared squares of order 25 are added to the existing eight found by Federico and Wilson. Our emphasis is on four simple perfect squared squares of order 25 and common reduced side 540. They have 12 elements in common but have pairwise identical elements differently arranged
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