News & Views |
Featured
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News & Views |
State of the game
Condensation usually describes a winner-takes-all phenomenon, in which a single state is macroscopically occupied. Game theory now reveals a mechanism for selecting an entire network of condensate states in a driven quantum system.
- Sebastian Diehl
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Review Article |
Exciton–polariton condensates
Exciton–polaritons, resulting from the light–matter coupling between an exciton and a photon in a cavity, form Bose–Einstein-like condensates above a critical density. Various aspects of the physics of exciton–polariton condensates are now reviewed.
- Tim Byrnes
- , Na Young Kim
- & Yoshihisa Yamamoto
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News & Views |
A black-hole laser
Astrophysical observations of Hawking radiation may be out of reach, but evidence for the self-amplification of Hawking radiation has now been observed in a sonic analogue of a black hole.
- Giovanni Modugno
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Article |
Observation of self-amplifying Hawking radiation in an analogue black-hole laser
Quantum effects allow black holes to radiate—offering a glimpse of how quantum field theory and general relativity might fit together. Hawking radiation has now been observed in a black hole analogue, with evidence that it can self-amplify.
- Jeff Steinhauer
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News & Views |
On the ladder
Trapping rubidium atoms in narrow lattices provides insight into the quantum mechanics of collections of interacting particles. This innovative approach reveals a phase transition similar to one found in superconductors.
- Erich Mueller
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Letter |
Cosmic structure as the quantum interference of a coherent dark wave
A cosmological model treating dark matter as a coherent quantum wave agrees well with conventional dark-matter theory on an astronomical scale. But on smaller scales, the quantum nature of wave-like dark matter can explain dark-matter cores that are observed in dwarf galaxies, which standard theory cannot.
- Hsi-Yu Schive
- , Tzihong Chiueh
- & Tom Broadhurst
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Article |
Experimental determination of the finite-temperature phase diagram of a spin–orbit coupled Bose gas
Spin–orbit coupling in Bose gases is expected to lead to new phenomena, but the thermodynamic properties are not yet fully understood. An ultracold atom experiment using artificial spin–orbit coupling uncovers the finite-temperature phase diagram and a transition between a stripe-ordered and a magnetized phase.
- Si-Cong Ji
- , Jin-Yi Zhang
- & Jian-Wei Pan
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News & Views |
Shock cooling a universe
Rapid cooling across a phase transition leaves behind defects; from domain walls in magnets to cosmic strings. The Kibble–Zurek mechanism that describes this formation of defects is seen at work in the spontaneous creation of solitons in an atomic Bose–Einstein condensate.
- Martin W. Zwierlein
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Article |
Spontaneous creation of Kibble–Zurek solitons in a Bose–Einstein condensate
The Kibble–Zurek mechanism describes the spontaneous formation of defects in systems that are undergoing a second-order phase transition at a finite rate. Familiar to cosmologists and condensed matter physicists, this mechanism is now found to be responsible for the spontaneous creation of solitons in a Bose–Einstein condensate.
- Giacomo Lamporesi
- , Simone Donadello
- & Gabriele Ferrari
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Article |
Engineering Ising-XY spin-models in a triangular lattice using tunable artificial gauge fields
A quantum gas trapped in an optical lattice of triangular symmetry can now be driven from a paramagnetic to an antiferromagnetic state by a tunable artificial magnetic field.
- J. Struck
- , M. Weinberg
- & L. Mathey
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Article |
Probing an ultracold-atom crystal with matter waves
Diffraction of matter waves from crystalline structures has long been used to characterize underlying spatial order. The same principle offers a valuable—and potentially non-destructive—tool for probing the strongly correlated phases of ultracold atoms confined to optical lattices.
- Bryce Gadway
- , Daniel Pertot
- & Dominik Schneble
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News & Views |
Disorderly arrest
An experimental demonstration that the expansion of ultracold atoms in three dimensions can be frozen by disorder provides fertile ground for studies of metal–insulator transitions in disordered systems — including those with interacting particles.
- Robin Kaiser
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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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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