Viewpoints

Crystal Vibrations Invert Quantum Dot Exciton

Crystal Vibrations Invert Quantum Dot Exciton

March 30, 2015

Stephen Hughes and Howard J. Carmichael

Phonons assist in creating an excitation-dominated state, or population inversion, in a single quantum dot—an effect that could be used to realize single-photon sources.

Single Dot Meets Single Ion

Single Dot Meets Single Ion

March 23, 2015

Nika Akopian

Researchers show that a single photon can transfer an excitation from a quantum dot to an ion.

Superconductivity with a Twist

Superconductivity with a Twist

March 16, 2015

Michael R. Norman

The discovery of superconductivity in a manganese-based “helical” magnet opens a new path to explore the relationship between superconductivity and magnetism.

More Power to Atom Interferometry

More Power to Atom Interferometry

March 11, 2015

Alexander D. Cronin and Raisa Trubko

An atom interferometer embedded in an optical cavity requires less power compared to previous techniques and may work with a wider variety of atoms and molecules.

Synopses

Baryon’s Innards Have Molecular Structure

Baryon’s Innards Have Molecular Structure

April 1, 2015

The Lambda baryon, in its excited state, behaves like a molecule, according to new lattice chromodynamics simulations of the particle’s magnetic structure.

Making Superconductors Sturdier

Making Superconductors Sturdier

March 31, 2015

Terahertz radiation could reduce thermal noise in superconducting cuprates and potentially increase their critical temperature.

Probing Chirality with Electron Vortices

Probing Chirality with Electron Vortices

March 26, 2015

Electron vortices can determine the chirality of crystals in high-resolution imaging techniques.

Spin-Orbit-Coupled Photons

Spin-Orbit-Coupled Photons

March 25, 2015

Photons confined to a hexagonally shaped microcavity move in a polarization-dependent way, thus simulating a spin-orbit coupling common in materials.

Focus

How to Stop a Nanosphere

How to Stop a Nanosphere

March 27, 2015

Combining two trapping techniques reduces the motion of a levitated bead close to the point where quantum effects should become observable.

Acoustic Structure Could Evade Sonar

Acoustic Structure Could Evade Sonar

March 20, 2015

A proposed acoustic version of a material that conducts electricity along its surface could lead to an improved way to hide submarines from sonar.

Notes from the Editors

Snapshots from the 2015 APS March Meeting

Snapshots from the 2015 APS March Meeting

March 19, 2015

Researchers from industry, universities, and major labs gathered at the annual APS March meeting held in San Antonio, Texas. Here’s a selection of this year’s presentations.

Announcements

Celebrating the 2015 International Year of Light

Physics revisits six specific advances in the science and technology of light that were reported in the APS journals.


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