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Black holes go supersonic

Black holes go supersonic

Now Luis Garay, James Anglin, Ignacio Cirac and Peter Zoller at the University of Innsbruck in Austria have proposed a realistic way to make an artificial “sonic” black hole in a tabletop experiment (L J Garay et al. 2000 Phys. Rev. Lett. 85 4643). In the February issue of Physics World, Ulf Leonhardt of the […]

Read article: Silicon lasers start to take shape

Silicon lasers start to take shape

Devices made from silicon dominate the microelectronics industry, so silicon should be the material of choice for anyone designing new electronic devices that will be integrated with microelectronic circuits. This also applies to the optoelectronic devices that act as gateways between the electronic realm and the worlds of photonics and optical communications. Most optoelectronic components […]

Vortices multiply in superfluid helium-II

Vortices multiply in superfluid helium-II

Now Demosthenes Kivotides, Carlo Barenghi and David Samuels at the University of Newcastle in the UK have discovered another surprising feature of liquid helium. They have predicted that the coupled motion of the normal and superfluid components can give rise to an intriguing structure that contains three vortex rings (Science 2000 290 777). In the […]

X-rays reveal some novel optical activity

X-rays reveal some novel optical activity

The so-called optical activity of materials has been studied extensively since then, so it is perhaps surprising that there is anything new to discover. However, José Goulon of the European Synchrotron Radiation Facility (ESRF) in Grenoble, France, and co-workers at the ESRF, the University of Paris and Purdue University in the US have recently observed […]

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