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By measuring gravity with cold atoms at three different heights simultaneously, a team determined a new property of a gravitational field.
Imaginary magnetic fields predicted by the fundamental theory of phase transitions can be realized experimentally.
A look back on our favorite stories from 2014.
The spin on a silicon defect in diamond can be prepared in a coherent quantum state, a promising sign that it could encode information in a quantum internet.
A network analysis finds that the European economies with the most interconnections, like Germany, are the most vulnerable to economic crises in the absence of government intervention.
A scheme using two pump wavelengths in the infrared and ultraviolet produces more efficient laserlike emission in air, which could benefit remote sensing applications.
An x-ray feature recently detected by different astronomy groups may be the long-awaited signature of dark matter.
An array of nanometer-sized aluminum pyramids acts as a directional antenna for light, and the direction depends on wavelength.
A visit to SLAC and Lawrence Berkeley Lab offers a look at two complementary approaches to making the x-ray source of the future.
Powerful stellar explosions may have caused mass extinctions on Earth and could also have prevented life from appearing on other planets until 5 billion years ago—and then only in the outskirts of galaxies.