News & Views |
Featured
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Letter |
Nodal superconducting-gap structure in ferropnictide superconductor BaFe2(As0.7P0.3)2
The Cooper pairs of conventional superconductors exhibit a nodeless s-wave symmetry, and most unconventional superconductors, including cuprates and heavy-fermion materials, exhibit nodal d-wave pairing. In contrast to both, angle-resolved photoemission spectroscopy measurements indicate that the iron-based superconductor BaFe2(As0.7P0.3)2 exhibits an unusual nodal s-wave pairing.
- Y. Zhang
- , Z. R. Ye
- & D. L. Feng
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Article |
Three-dimensional localization of ultracold atoms in an optical disordered potential
An experimental study of three-dimensional localization of ultracold atoms in controlled disorder provides evidence for behaviour that is consistent with Anderson localization, but incompatible with classical trapping.
- F. Jendrzejewski
- , A. Bernard
- & P. Bouyer
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Article |
Satellites and large doping and temperature dependence of electronic properties in hole-doped BaFe2As2
An approach to first-principles simulations that incorporates dynamically screened Coulomb interactions between iron d electrons enables the low-energy electronic structure and angle-resolved photoemission spectroscopy spectra of iron-based superconductors to be modelled with unprecedented accuracy.
- Philipp Werner
- , Michele Casula
- & Silke Biermann
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Correspondence |
Debate over dispersion direction in a Tomonaga–Luttinger-liquid system
- K. Nakatsuji
- & F. Komori
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Correspondence |
Reply to "Debate over dispersion direction in a Tomonaga–Luttinger-liquid system"
- C. Blumenstein
- , J. Schäfer
- & R. Claessen
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News & Views |
Where did all the electrons go?
Geomagnetic storms driven by the solar wind can cause the flux of high-energy electrons in the Earth's Van Allen belts to rapidly fall. Analysis of data obtained during one such event from multiple spacecraft located at different altitudes in the magnetosphere reveals just where these electrons go.
- Mary K. Hudson
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Editorial |
The big time
Two big-science projects — the Large Hadron Collider and the Planck satellite — are set to deliver major results in the coming year.
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News & Views |
State secrets squeezed
Squeezed states push the limits of quantum measurement precision, but observing them is never straightforward. In spin-1 Bose–Einstein condensates, an elegant algebra reveals squeezed states that would otherwise go unnoticed.
- Austen Lamacraft
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Letter |
Spin-nematic squeezed vacuum in a quantum gas
Squeezed states—which permit precision beyond the scope of Heisenberg’s uncertainty relation—are well established for spin-1/2 particles. Now an elegant demonstration of squeezing in spin-1 condensates generalizes the criteria for squeezed states to higher spin dimensions.
- C. D. Hamley
- , C. S. Gerving
- & M. S. Chapman
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Article |
Multistep redirection by cross-beam power transfer of ultrahigh-power lasers in a plasma
A demonstration of the ability to control the flow of laser energy in a dense plasma by tuning the colour of multiple laser beams injected into it could be useful in the development of laser-driven fusion.
- J. D. Moody
- , P. Michel
- & E. I. Moses
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Letter |
Large-scale electron acceleration by parallel electric fields during magnetic reconnection
Magnetic reconnection is a process by which the field lines of a magnetized plasma undergo dramatic realignment, releasing large amounts of energy. Large-scale simulations of reconnection events in the Earth’s magnetosphere suggest that this process takes place over much greater distances than previously expected.
- J. Egedal
- , W. Daughton
- & A. Le
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Letter |
Emergent electrodynamics of skyrmions in a chiral magnet
An experiment demonstrates that the motion of so-called skyrmions—topologically quantized magnetic whirls—causes an emergent electric field that inherits the topological quantization of the skyrmions and is directly visible in the Hall effect.
- T. Schulz
- , R. Ritz
- & A. Rosch
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Article |
Probing the relaxation towards equilibrium in an isolated strongly correlated one-dimensional Bose gas
How quantum many-body systems relax from an initial non-equilibrium state is one of the outstanding problems in quantum statistical physics. A study combining an experimental approach for monitoring the dynamics of strongly correlated cold atoms with theoretical analysis now provides quantitative insights into the problem.
- S. Trotzky
- , Y-A. Chen
- & I. Bloch
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News & Views |
Order in disorder
Confining liquid 3He in porous silica aerogel prepared with strong anisotropy stabilizes a state of axial superfluidity.
- Vladimir P. Mineev
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Letter |
Nonlinear detection of spin currents in graphene with non-magnetic electrodes
The degree to which an electrical current is spin polarized is usually determined by how easily it travels across an interface with a magnetic contact. By using nonlinear interactions between spin and charge in graphene, the polarization of spin currents can be measured without magnetic contacts.
- Ivan J. Vera-Marun
- , Vishal Ranjan
- & Bart J. van Wees
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Letter |
New chiral phases of superfluid 3He stabilized by anisotropic silica aerogel
Liquid 3He in silica aerogel exhibits no trace of the chiral superfluid phase present in bulk 3He. Stretching the aerogel axially introduces an anisotropy that stabilizes the chiral phase, supporting a transition to a new disordered phase at low temperatures.
- J. Pollanen
- , J. I. A. Li
- & J. A. Sauls
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News & Views |
To see a SAW
Mechanical oscillations of microscopic resonators have recently been observed in the quantum regime. This idea could soon be extended from localized vibrations to travelling waves thanks to a sensitive probe of so-called surface acoustic waves.
- Aashish Clerk
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News & Views |
A lightning-fast change
A single photon can alter the shape of a molecule. It is now shown that quantum effects can play an important role in this change leading to conformation relaxation rates hundreds of times faster than previously expected.
- Shaul Mukamel
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Article |
Local probing of propagating acoustic waves in a gigahertz echo chamber
Mechanical oscillations of microscopic resonators have recently been observed in the quantum regime. This idea could soon be extended from localized vibrations to travelling waves thanks to a sensitive probe of so-called surface acoustic waves.
- Martin V. Gustafsson
- , Paulo V. Santos
- & Per Delsing
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Article |
A molecular conveyor belt by controlled delivery of single molecules into ultrashort laser pulses
Individual molecules are now deterministically trapped in few-femtosecond laser pulses. This molecular conveyer belt may become a useful tool for probing ultrafast molecular dynamics.
- Steffen Kahra
- , Günther Leschhorn
- & Tobias Schaetz
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Article |
Femtosecond torsional relaxation
A molecule can alter shape as it absorbs a photon. It is now shown that quantum effects can play an important role in this change leading to conformation rates hundreds of times faster than previously expected.
- J. Clark
- , T. Nelson
- & G. Lanzani
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Letter |
Shallow pockets and very strong coupling superconductivity in FeSexTe1−x
One proposed explanation of unconventional superconductivity involves describing it in terms of a crossover from a conventional superconducting state to a Bose–Einstein condensate state. Angle-resolved photoelectron measurements of an iron chalcogenide superconductor could provide evidence for such crossover behaviour.
- Y. Lubashevsky
- , E. Lahoud
- & A. Kanigel
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News & Views |
The Sleeping Beauty approach
Two-qubit entanglement can be preserved by partially measuring the qubits to leave them in a 'lethargic' state. The original state is restored using quantum measurement reversal after the qubits have travelled through a decoherence channel.
- Alexander N. Korotkov
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News & Views |
Carbon's superconducting footprint
Graphene exhibits many extraordinary properties, but superconductivity isn't one of them. Two theoretical studies suggest that by decorating the surface of graphene with the right species of dopant atoms, or by using ionic liquid gating, superconductivity could yet be induced.
- Oskar Vafek
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News & Views |
Through the quantum chicane
In quantum control there is an inherent tension between high fidelity requirements and the need for speed to avoid decoherence. A direct comparison of quantum control protocols at these two extremes indicates where the sweet spot may lie.
- Lloyd C. L. Hollenberg
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Article |
Giant superfluorescent bursts from a semiconductor magneto-plasma
Superfluorescence—the emission of coherent light from an initially incoherent collection of excited dipoles—is now identified in a semiconductor. Laser-excited electron–hole pairs spontaneously polarize and then abruptly decay to produce intense pulses of light.
- G. Timothy Noe II
- , Ji-Hee Kim
- & Junichiro Kono
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Article |
Probing and controlling non-Born–Oppenheimer dynamics in highly excited molecular ions
Probing the explosion of nitrous oxide ions in real time using high-harmonic radiation and infrared laser pulses now provides insight into the correlated dynamics of electrons and nuclei during photoionization.
- X. Zhou
- , P. Ranitovic
- & M. M. Murnane
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Letter |
Explaining sudden losses of outer radiation belt electrons during geomagnetic storms
Geomagnetic storms driven by the solar wind can cause a dramatic drop in the flux of high-energy electrons in the Earth’s outer Van Allen belt. Analysis of data obtained during such an event by three different sets of spacecraft suggests that these electrons are directed into space rather than lost to the atmosphere.
- Drew L. Turner
- , Yuri Shprits
- & Vassilis Angelopoulos
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Letter |
Hanbury Brown and Twiss correlations across the Bose–Einstein condensation threshold
Measurements of Hanbury Brown and Twiss correlations in atomic gases near the Bose–Einstein condensation threshold reveal strong signatures of interactions between the constituent atoms, and establish such correlation measurements as a sensitive probe for the quantum properties of matter-wave sources.
- A. Perrin
- , R. Bücker
- & J. Schmiedmayer
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News & Views |
The stress of light cools vibration
Brillouin scattering of light is now shown to attenuate the Brownian motion of microscopic acoustic resonators. This electrostrictive phenomenon could be a useful complement to the ponderomotive and photothermal effects that can optically control optomechanical systems.
- Ivan Favero