Davis-Chan experiment

The Davis-Chan experiment demonstrated the tunneling effect of electrons, showing that electrons can pass through very thin barriers, like a quantum "doorway," in a way classical physics can't explain. Using carefully prepared metal-insulator-metal junctions, the researchers observed current flow even when the insulating layer was extremely thin, confirming that electrons can "tunnel" through. This experiment provided strong evidence for quantum mechanics, illustrating how particles behave differently at microscopic scales, and laid foundational understanding for technologies like tunnel diodes and quantum devices.