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Peer-reviewed journal of the American Physical Society publishing concise, high-impact letters on major advances across all areas of physics.
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IISER Bhopal physicists report YbSb2 as the first type I superconductor shown to break time-reversal symmetry. Every earlier case was type II, so the extension to a new class of superconductor rests for now on one muon study that its authors call evidence.
Reality
H.E.S.S. searched 546 hours of Milky Way centre data for a single-energy gamma-ray line from dark matter and found no significant signal. Its upper limits now reach the annihilation rates the collaboration says matter for WIMPs, a leading dark matter candidate.
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Brookhaven's STAR experiment found a dip in collision-to-collision particle-flow fluctuations across about 1 billion gold collisions at 3 to 7.7 GeV. The researchers call it a hint of nuclear matter's long-sought critical point, short of proof.
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Researchers programmed a photonic chip to read a lossy system's topology in momentum space, finding a Zak phase of 1.02 pi where theory predicts pi. The chip simulates each momentum point from a model, so it can map many phases on one device but has not yet measured a real material.
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Astronomers timing PSR J1856-0039 with China's FAST telescope found the lowest combined mass of any known double neutron star system. The orbit shrinks as general relativity predicts, and formation models now have a lighter pair to account for.
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Physicists in Basel and Paderborn used an optical cavity to make quantum-dot cascade photons 90% indistinguishable, up from 60%. The fix targets the timing correlations that have limited these on-demand sources, and brightness and entanglement performance have yet to be reported.
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Serhiy Yanchuk's team at University College Cork found narrow 'funnels' extending from stable-state basins in simulations of up to 10 linked oscillators. Because the work rests on model systems, how far the funnels alter real climate or brain forecasts is an open question.
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Researchers including Peking University's Lin Yang bent undoped diamond nanoribbons to a 1.49% peak strain and found the gradient tunes the light they emit. Strain could replace doping in diamond, where dopants trap charge carriers at room temperature, but the emitted light was measured at 80 K.
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University of Toronto physicists say hidden eight-pole magnetic order leaves a handedness in crystal vibrations that light can read. Ordinary probes miss this 'octupolar' state, so researchers can now look for it before anyone tries to build memory from it.
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CMS physicists have measured, for the first time, the diffusion wakes jets leave behind in quark-gluon plasma, 20 years after they were first predicted. The result adds a second test of the fluid picture of the matter that filled the universe for its first microseconds.
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Galanti and Roncadelli calculate that standard physics expects about 10^-96 photons at 300 TeV, the energy of the Carpet detector's photon-like event. Their fix, combining axion-like particles with a violation of Lorentz invariance, is needed only if that single event was a genuine photon.
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Andrew Lucas of CU Boulder and a co-author proved the 2D random-bond quantum Ising model stays ferromagnetic under weak quantum fluctuations. The result, published in Physical Review Letters, confirms a long-standing conjecture in quantum statistical mechanics.
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Colliding oxygen-16 and neon-20 produced quark-gluon plasma, and the outgoing particles carried the shape of the incoming nuclei. Light-ion runs now buy two results at once.
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Ketterle's group at MIT calculated that the quantum memory the proposed beam relied on is about ten trillion times too brief. They also found that because neutrinos are fermions, its trace suppresses the next emission instead of seeding it.
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ICFO physicists used spin rephasing to store single photons in a praseodymium-doped crystal for up to 180 microseconds. The photons stayed quantum-correlated through the wait, which the team equates with more than 30 km of optical fibre.
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Reading a cosmic-ray shower has always meant trusting a computer model of what happens in air. Last July the LHC made the collision those models start from, under conditions physicists chose.
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Labs at EPFL and the Weizmann Institute each measured quasiparticles with a quarter of an electron's charge in the ν = 1/2 quantum Hall state. The agreement settles the charge of a state thought to be non-Abelian, though the exchange behavior a topological qubit would need was not tested.
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Rice-led physicists simulated autferroic switches flipping over 400,000 times a second, up from under 100, to generate true random bits. The gain exists only in modeling, against slow magnetic switches, so the case for security chips waits on a material someone can make.
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Three theorists at the University of Oslo worked out what an ideal shutter does to one photon. Inside a small transition region, the truncated state turns out to need a classical mixture and a quantum superposition of many photons.
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At very low temperature, quantum fluctuations can unfreeze a spin glass instead of locking it tighter, and the state on the other side is the fast, entangled one the SYK model uses to describe black holes.
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