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176.
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Physics 2, 13 (2009) – Published February 17, 2009 Using a double spin-filter tunnel junction consisting of two magnetic insulating layers, researchers have observed a sizeable magnetoresistance without using magnetic electrodes, thus tuning the tunneling via the magnetic state of the insulating layers and by application of an electric voltage. |
177.
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Physics 2, 14 (2009) – Published February 17, 2009 Imaging and tracking of bubbles in liquid helium formed by individual electrons allows study of superfluid vortices, and may permit analysis of unusual ionic species in fluids. |
178.
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Published February 17, 2009 A new analysis of photoemission measurements on a material undergoing a metal-insulator transition suggests that an apparent surface “dead layer” is really a bulk effect. |
179.
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Published February 12, 2009 Researchers report an unusual critical scaling regime in a material that goes from a spin liquid to a spiral magnet upon application of a magnetic field. |
180.
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Physics 2, 11 (2009) – Published February 9, 2009 A magnetic domain wall moving along a ferromagnetic wire can generate a voltage across the wire. This electromotive force, which is not the same as Faraday’s law of induction, is part of a growing family of interactions that are being discovered in the field of spintronics. |
181.
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Physics 2, 12 (2009) – Published February 9, 2009 Researchers bring the prospect of new electronic devices based on oxide materials closer to reality by doping interfaces via polar discontinuities rather than chemical substitution. |
182.
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Published February 9, 2009 Interactions between dark matter particles may explain unusual matter-antimatter production rates in the universe. |
183.
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Published February 9, 2009 The development of an accurate density functional method that scales linearly with system size will enable the study of large ensembles of atoms. |
184.
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Published February 9, 2009 Images of the craters that form in underwater sand piles as air is forced to flow from beneath lead to a quantitative model of granular flow. |
185.
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Physics 2, 9 (2009) – Published February 2, 2009 Atomic & Molecular Physics Superfluidity Recent calculations of the properties of ultracold atoms have revealed how two-body interactions at very short distances determine essential properties of many-body systems. |
186.
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Physics 2, 10 (2009) – Published February 2, 2009 Astrophysics Particles & Fields Cosmology Many cosmologists believe that antiprotons in cosmic rays come from the annihilation of dark matter. Data from the PAMELA experiment on board a Russian satellite provide an important test of this possibility. |
187.
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Published February 2, 2009 Particles & Fields String Theory In particle physics theory, the presence of multiple metastable vacua gives rise to new possibilities for transitions between energy states. |
188.
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Published February 2, 2009 A laser beam in a squeezed state may be an effective source for cooling a macroscopic resonator. |
189.
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Published February 2, 2009 Small changes in stoichiometry can destroy superconductivity in FeSe. |
190.
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Published February 2, 2009 A rigorous estimate shows that an error correction code for a scalable quantum computer can accommodate error at the 0.1% level—about ten times more tolerant than most other methods. |
191.
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Published January 28, 2009 Scientists identify the microscopic origin of a record magnetocaloric effect in Mn1+yFe1-y(P1-xGex). |
192.
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Physics 2, 7 (2009) – Published January 26, 2009 The blurring effects of diffraction pose an obstacle to transmitting an image with all-optical technology. A method to reduce diffraction that takes advantage of the thermal motion of atoms could prove a way to keep images sharp. |
193.
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Physics 2, 8 (2009) – Published January 26, 2009 Scientists have found that the spontaneous ferroelectric polarization can be fully and reversibly flipped by varying partial oxygen pressure above the surface of an epitaxially compressed PbTiO3 film. The inward polarized state is stabilized by ordered oxygen vacancies in the topmost atomic layer. |
194.
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Published January 26, 2009 Measurements at Fermilab hint at a new particle—but not the one they were looking to find. |
195.
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Published January 26, 2009 Measurements of how out-of-equilibrium electrons lose energy along a carbon nanotube reveal that they do not significantly scatter over several microns. |
196.
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Published January 22, 2009 Trapping atoms inside of a submicron volume for applications such as quantum computing and nanoscale optics poses a host of experimental difficulties. One idea for doing this takes advantage of the strong electric field that can be excited on the surface of metal nanoparticles. |
197.
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Physics 2, 5 (2009) – Published January 20, 2009 Particles & Fields Nuclear Physics The critical point is one of the main features of the phase diagram of strongly interacting quark-gluon matter. Finding this critical point in the lab will require luck and an understanding of the possible experimental signatures. |
198.
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Physics 2, 6 (2009) – Published January 20, 2009 The presence of iron in gold has long been known to lead to an increase in gold’s low-temperature resistivity. Theorists argue that this “Kondo effect” may have implications for spintronics as well. |
199.
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Published January 20, 2009 The results from a search at Fermilab for the Higgs boson edge closer to the predictions of the Standard Model. |
200.
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Published January 16, 2009 Ultracold atoms in an optical lattice share a lot of physics with electrons in a crystalline solid and it is a system that is often much easier to control. By forcing an optical lattice to vary with time, it is possible to engineer the energy of cold atoms and essentially bring them to a halt. |
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