Phys. Rev. Focus21, 21 (2008) – Published June 25, 2008
A new theory on the interactions of nanoparticles with laser light predicts some surprising effects when more than one particle is involved, such as a particle being drawn toward the source of the beam, against the flow of photons.
Phys. Rev. Focus21, 17 (2008) – Published May 21, 2008
Electrons can act like light waves in many ways, but according to recent experiments, their wave-like effects don’t always correspond with light. The unexpected behavior occurs because electrons feel each other’s presence, while photons do not.
Phys. Rev. Focus21, 14 (2008) – Published April 23, 2008
Ghost imaging, in which images are made using light that never came near the object, has now been demonstrated with reflected light, but the debate continues over whether the effect can be explained with classical physics.
Phys. Rev. Focus21, 13 (2008) – Published April 17, 2008
Researchers used a magnetic material to create a difference in current-carrying properties between two perpendicular directions in a superconductor. They could easily change the directions with an external magnetic field, which could be useful in superconducting devices.
Phys. Rev. Focus21, 12 (2008) – Published April 7, 2008
Researchers have simulated the formation of complex shapes formed spontaneously by sheets of polymers in solution. The results provide a recipe for experimentalists that are studying these structures for drug delivery and nanofabrication.
Phys. Rev. Focus21, 11 (2008) – Published April 2, 2008
In the 1970s and 80s, researchers developed techniques for cooling atoms to very low temperatures using laser light. The work led to improvements in atomic clocks and the observation of a new ultracold state of matter.
Phys. Rev. Focus21, 9 (2008) – Published March 11, 2008
Researchers demonstrated an atom slowing and trapping scheme that may apply to elements that have been difficult or impossible to cool before. The atoms need only an unpaired electron, not a special set of internal states.
Phys. Rev. Focus21, 8 (2008) – Published March 5, 2008
A century-old empirical law relates the number of times a material will survive a repeated stress to the size of the stress. A new model connects this law with steadily accumulating damage at the microscale.
Phys. Rev. Focus21, 5 (2008) – Published February 6, 2008
New calculations show that a material with the right electrical properties could dramatically improve the efficiency of light-like waves that travel on metal surfaces. Devices based on these waves might someday process light signals on a chip.
Phys. Rev. Focus21, 4 (2008) – Published January 28, 2008
An electric field could prevent a stressed material from developing cracks, according to a new theory. The field could nudge atoms moving around on the surface and thereby flatten out undulations that can grow into cracks.
Phys. Rev. Focus21, 3 (2008) – Published January 23, 2008
In 1939 Hans Bethe described in detail the nuclear reactions that power the sun and other stars, leading to his Nobel Prize in 1967. His results relied heavily on the previous decades of advances in physics and astronomy.