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Physics Update
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Letters
Search and Discovery
Atom Interferometers Prove Their Worth in Atomic Measurements
Researchers have used an atom interferometer to measure for the first time the complex index of refraction for an atom wave passing through a gas and to determine the electrical polarizability of an atom more precisely than before.
In a Two‐Dimensional Electron System, the Skyrmion's the Limit
A sensitive nmr technique has found evidence for skyrmions in a two‐dimensional electron system and challenged our understanding of the quantum Hall effects.
Articles
Thermoacoustic Engines and Refrigerators
On the heels of basic research, commercial developers are harnessing acoustic processes in gases to make reliable, inexpensive engines and cooling devices with no moving parts and a significant fraction of Carnot's efficiency.
The Discovery of Superfluidity
Superfluidity and superconductivity have strong analogies to each other. Why then did over a quarter of a century pass between the discoveries of these two phenomena?
