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https://www.nobelprize.org/prizes/physics/1937/davisson/facts/

One of the 1937 noble prize winners in physics for his work in particle wave duality of matter (not just mathematically, but physically)

"In the beginning of the 19th century, quantum physics evolved from the idea that energy is conveyed in only certain fixed amounts. An early finding indicated that light can be regarded as both waves and particles. Later it was proposed that matter, such as electrons, also can be described as both waves and particles. In 1927 Clinton Davisson and G.P. Thomson demonstrated, independently of one another, that electrons could be described as waves. When an electron beam passed through a nickel crystal, diffraction patterns appeared."