Optical frequency combs—laser sources that emit evenly spaced colors of light—are foundational, ubiquitous tools for ...

For more than 40 years, scientists have known that the quantum Hall effect impacts electrons in strong magnetic fields, but ...

Scientists have achieved a historic first using lasers to study electron behaviour, revealing new insights into how light ...

While the terms "quantum physics" and "Theory of Relativity" are used casually every day, not many people know what they really mean. Yet these theories have had a profound impact not only on science ...

Penn-led researchers have shown for the first time that multiple, information-carrying light signals can be safely guided through chip-based, reconfigurable networks using topology, the esoteric ...

In condensed matter physics, things can get pretty weird. When temperatures get close to absolute zero, it is possible to put matter in a state called supersolid, a crystal that can flow without ...

Representation of domain walls within a ferromagnetic layered material. New research shows that when these materials are hit with a free electron laser, magnetic domain walls move much faster than ...

Can we turn back time? Ask a savvy physicist, and the answer will be “it depends.” Schemes for retrograde time travel abound but usually involve irreconcilable paradoxes and rely on outlandish ...

In Her Space, Her Time, physicist Shohini Ghose elucidates the stories of women scientists who contributed to and led some of the biggest breakthroughs in astronomy and physics. Big questions in ...