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Latest Atomic physics Stories

2009-02-06 08:48:48

Scientists at the Naval Research Laboratory (NRL) have recently demonstrated the ability to control the spin population of the individual quantum shell states of self-assembled indium arsenide (InAs) quantum dots (QDs). These results are significant in the understanding of QD behavior and scientists' ability to utilize QDs in active devices or for information processing. The scientists, from NRL's Materials Science and Technology Division, used a spin-polarized bias current from an iron (Fe)...

2009-01-14 09:22:10

Physicists at the Joint Quantum Institute (JQI) of the National Institute of Standards and Technology (NIST) and the University of Maryland have proposed a recipe for turning ultracold "boson" atoms"”the ingredients of Bose-Einstein condensates"”into a "supersolid," an exotic state of matter that behaves simultaneously as a solid and a friction-free superfluid. While scientists have found evidence for supersolids in complex liquid helium mixtures, a supersolid formed from such...

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2008-12-08 08:55:35

Physicists have taken a significant step toward creation of quantum networks by establishing a new record for the length of time that quantum information can be stored in and retrieved from an ensemble of very cold atoms. Though the information remains usable for just milliseconds, even that short lifetime should be enough to allow transmission of data from one quantum repeater to another on an optical network. The new record "“ 7 milliseconds for rubidium atoms stored in a dipole...

2008-09-21 15:30:00

Scientists at the IBM (NYSE: IBM) Almaden Research Center in San Jose, CA have forged a breakthrough in understanding an intriguing phenomenon in fundamental physics: the Kondo effect. They report their findings today in the scientific journal Nature Physics. The Kondo effect, one of the few examples in physics where many particles collectively behave as one object (a single quantum-mechanical body), has intrigued scientists around the world for decades. Now, using a technique that was...

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2008-07-01 16:10:00

Rice experiment yields closest analog yet for classic atomic model Nearly a century after Danish physicist Niels Bohr offered his planet-like model of the hydrogen atom, a Rice University-led team of physicists has created giant, millimeter-sized atoms that resemble it more closely than any other experimental realization yet achieved. The research is available online in Physical Review Letters. Bohr offered the first successful theoretical model of the atom in 1913, suggesting that electrons...

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2008-04-30 08:38:36

Researchers at the National Institute of Standards and Technology (NIST) and Max Planck Institute for Physics in Germany believe they can achieve a significant increase in the accuracy of one of the fundamental constants of nature by boosting an electron to an orbit as far as possible from the atomic nucleus that binds it. The experiment, outlined in a new paper, would not only mean more accurate identifications of elements in everything from stars to environmental pollutants but also could...

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2008-04-02 15:52:22

A research team from the National Institute of Standards and Technology (NIST) and the University of Maryland has succeeded in cooling atoms of a rare-earth element, erbium, to within two millionths of a degree of absolute zero using a novel trapping and laser cooling technique. Their recent report* is a major step towards a capability to capture, cool and manipulate individual atoms of erbium, an element with unique optical properties that promises highly sensitive nanoscale force or...

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2008-03-10 16:04:13

Ultracold atoms moving through a carefully designed arrangement of laser beams will jiggle slightly as they go, two NIST scientists have predicted.* If observed, this never-before-seen "jitterbug" motion would shed light on a little-known oddity of quantum mechanics arising from Paul Dirac's 80-year-old theory of the electron. Dirac's theory, which successfully married the principles of Einstein's relativity to the quantum property of electrons known as spin, famously predicted that the...

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2008-03-06 11:50:00

Scientists from the University of Texas at Austin open up new avenues of research using atomic coilguns and lasersStopping and cooling most of the atoms of the periodic table is now possible using a pair of techniques developed by physicist Mark Raizen at The University of Texas at Austin. Raizen stopped atoms by passing a supersonic beam through an "atomic coilgun" and cooled them using "single-photon cooling." The techniques are a major step forward in atomic physics and have a variety of...

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2005-10-11 14:12:27

Trapping, cooling, and storing neutral atoms requires an elaborate process. As a first method we have, now almost classic, laser cooling in a "magneto-optical trap". Atoms are shot from six directions with laser beams whose frequency lies somewhat below the excitation energy. In this way, the particles always absorb light when they move themselves on the beam - because of the Doppler effect, they are in resonance - and then are slowed down in this direction. We call it cooling, when an...


Latest Atomic physics Reference Libraries

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2013-03-16 00:00:00

Niels Henrik David Bohr (October 7, 1885 - November 18, 1962) was a Danish physicist. He made essential contributions to understanding atom structure and quantum mechanics. Born in Copenhagen, Denmark to Christian Bohr and Ellen Adler, Bohr got his doctorate at Copenhagen University in 1911. He then studied under Ernest Rutherford in Manchester, England. Based on Rutherford's theories, Bohr published his Bohr model about atom structure in 1913, introducing the theory of electrons...

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