Authors: George Rajna
An international team of researchers from Thailand, the U.S. and Japan has conducted a thorough study of an exotic behavior of material called a noncentrosymmetric antiferromagnet. [16] So-called spatial light modulators that serve as a base for all LCDs, among other things, can be arranged so that each pixel can switch the light quickly, making it brighter or weaker by rotating the polarization of light. [15] An international collaborative of scientists has devised a method to control the number of optical solitons in microresonators, which underlie modern photonics. [14] Solitary waves called solitons are one of nature's great curiosities: Unlike other waves, these lone wolf waves keep their energy and shape as they travel, instead of dissipating or dispersing as most other waves do. In a new paper in Physical Review Letters (PRL), a team of mathematicians, physicists and engineers tackles a famous, 50-year-old problem tied to these enigmatic entities. [13] Theoretical physicists studying the behavior of ultra-cold atoms have discovered a new source of friction, dispensing with a century-old paradox in the process. Their prediction, which experimenters may soon try to verify, was reported recently in Physical Review Letters. [12] Solitons are localized wave disturbances that propagate without changing shape, a result of a nonlinear interaction that compensates for wave packet dispersion. Individual solitons may collide, but a defining feature is that they pass through one another and emerge from the collision unaltered in shape, amplitude, or velocity, but with a new trajectory reflecting a discontinuous jump.
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