Research Highlights |
Featured
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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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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 |
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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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 |
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 |
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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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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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 |
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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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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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
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News & Views |
Hot electrons but cool vibrations
The electronic degrees of freedom in semiconductor membranes provide an innovative new way of cooling mechanical motion.
- Andrew Armour
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Letter |
Observation of spontaneous Brillouin cooling
A novel mechanism for cooling tiny mechanical resonators is now demonstrated. Inelastic scattering of light from phonons in an electrostrictive material attenuates the Brownian motion of the mechanical mode.
- Gaurav Bahl
- , Matthew Tomes
- & Tal Carmon
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Article |
Chiral superconductivity from repulsive interactions in doped graphene
Chiral superconducting states are expected to support a variety of exotic and potentially useful phenomena. Theoretical analysis suggests that just such a state could emerge in a doped graphene monolayer.
- Rahul Nandkishore
- , L. S. Levitov
- & A. V. Chubukov
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Article |
Optical cavity cooling of mechanical modes of a semiconductor nanomembrane
A novel mechanism for cooling nanomechanical objects has now been demonstrated. Optically excited electron–hole pairs produce a mechanical stress that damps the motion of a gallium arsenide membrane. In this way, the nanoscale resonator is cooled from room temperature to 4 K.
- K. Usami
- , A. Naesby
- & E. S. Polzik
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Article |
Fermionic transport and out-of-equilibrium dynamics in a homogeneous Hubbard model with ultracold atoms
The transport measurements of an interacting fermionic quantum gas in an optical lattice provide a direct experimental realization of the Hubbard model—one of the central models for interacting electrons in solids—and give insights into the transport properties of many-body phases in condensed-matter physics.
- Ulrich Schneider
- , Lucia Hackermüller
- & Achim Rosch
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Letter |
Experimental demonstration of a universally valid error–disturbance uncertainty relation in spin measurements
According to Heisenberg, the more precisely, say, the position of a particle is measured, the less precisely we can determine its momentum. The uncertainty principle in its original form ignores, however, the unavoidable effect of recoil in the measuring device. An experimental test now validates an alternative relation, and the uncertainty principle in its original formulation is broken.
- Jacqueline Erhart
- , Stephan Sponar
- & Yuji Hasegawa
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News & Views |
Polariton pendulum
A macroscopic quantum pendulum has now been created by confining a polariton condensate in a parabolic optical trap. Spectacular images of multiparticle wavefunctions are obtained by purely optical means.
- Alexey Kavokin
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Article |
Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA
Rapid particle acceleration is possible using a fixed-field alternating-gradient machine—but ‘scaling’ in its design has been necessary to avoid beam blow-up and loss. The demonstration now of acceleration in such a machine without scaling has positive implications for future particle accelerators.
- S. Machida
- , R. Barlow
- & T. Yokoi
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Letter |
Phonon-mediated superconductivity in graphene by lithium deposition
Graphene exhibits many extraordinary properties. But, despite many attempts to find ways to induce it, superconductivity is not one of them. First-principles calculations suggest that by decorating the surface of graphene with lithium atoms, it could yet be made to superconduct.
- Gianni Profeta
- , Matteo Calandra
- & Francesco Mauri
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Letter |
Spin-half paramagnetism in graphene induced by point defects
The presence, or otherwise, of magnetism in graphene has been the subject of much debate. A systematic study of point defects—a widely suggested source of ferromagnetism in graphene—suggests that although they can exhibit net spin, they remain paramagnetic, even at liquid helium temperature.
- R. R. Nair
- , M. Sepioni
- & I. V. Grigorieva
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