In a discovery that brings a legendary quantum theory to life, physicists at Princeton University have directly observed Hofstadter’s butterfly — a fractal pattern in electron energy levels ...

A new study published in Nature Physics introduces a theory of electron-phonon coupling that is affected by the quantum geometry of the electronic wavefunctions.

An attosecond—or 0.000000000000000001 second—is no time at all for a person. That is not so for electrons, atoms and molecules, and laser-wielding scientists are revealing the action ...

The photoelectric effect, first explained in 1905, transformed our understanding of how light interacts with matter. When ...

A quantum version of a fractal pattern, known as "Hofstadter's butterfly," has long been predicted, but the new study marks the first time it has been directly observed experimentally in a real ...

Quantum sensors have become important tools in low-energy particle physics. Michael Doser explores opportunities to exploit ...

Using a highly sophisticated telescope, a team of researchers recorded the highest-energy light ever detected from the sun, reaching up to nearly 10 trillion electron volts, according to a study ...

Since it has 1 more electron than protons, chlorine has a charge of –1, making it a negative ion. When ions form, atoms gain or lose electrons until their outer energy level is full. For example, when ...