Linked from
The 13 pages that link to De Broglie wavelength, each with the reason it gives.
Wave–particle dualityRelated: It assigns a quantitative wave scale to particles such as electrons.
Reduced Planck constantRelated: In angular wave-number notation, the same relation uses ℏ.
Matter waveBroader topic: It gives the quantitative relation at the heart of a matter wave.
Ultracold atomsRelated: Cooling lengthens atomic matter waves until neighboring atoms can overlap.