## Recent Articles

Atomic and Molecular Physics

### Synopsis: Dipolar Gas Chilled to Near Zero

The cooling of strongly dipolar molecules to their absolute ground state has opened the possibility of creating new forms of matter. Read More »

Optics

### Viewpoint: Cavity with Iron Nuclei Slows Down X Rays

Slow light effects have been measured for x rays using a cavity filled with iron nuclei, where the speed of light was reduced by a factor of 10,000. Read More »

Semiconductor Physics

### Focus: Landmarks—Accidental Discovery Leads to Calibration Standard

The quantum Hall effect, discovered unexpectedly $35$ years ago, is now the basis for defining the unit of electrical resistance. Read More »

Particles and Fields

### Viewpoint: A More Precise Higgs Boson Mass

A new value for the Higgs boson mass will allow stronger tests of the standard model and of theories about the Universe’s stability. Read More »

Magnetism

### Synopsis: Spin Transport in Room-Temperature Germanium

Germanium layers can carry spin-polarized currents over several hundred nanometers at room temperature, a key asset for spintronic applications. Read More »

Astrophysics

### Synopsis: Quakes in Neutron Stars

Simulations of the magnetic field of a neutron star show that shear stresses induced by the field are strong enough to fracture the star’s crust. Read More »

Statistical Physics

### Viewpoint: An Equation of State for Active Matter

An equation of state for a gas of self-propelled spheres is a step towards a thermodynamic description of “active” matter, such as bird flocks and tissue. Read More »

Industrial Physics

### Focus: Liquid Helium Brewed Locally

A new device for recycling the helium coolant in an MRI scanner or similar machine uses elevated pressure to dramatically increase the rate at which helium is liquefied. Read More »

Quantum Information

### Synopsis: Nanofiber Optical Memory

Light signals propagating down an ultrathin fiber can be temporarily stored in a cloud of cold atoms surrounding the fiber. Read More »