Featured
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Universal equation of state for wave turbulence in a quantum gas
Equilibrium-like state variables, related by an equation of state, are identified in a study of turbulent cascade of matter waves in a far-from-equilibrium ultracold atomic Bose gas.
- Lena H. Dogra
- , Gevorg Martirosyan
- & Zoran Hadzibabic
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Article
| Open Access
Density-wave ordering in a unitary Fermi gas with photon-mediated interactions
An experiment with atoms and photons provides a fully tunable and microscopically controllable platform for the experimental study of the interplay of superfluidity and density-wave order.
- Victor Helson
- , Timo Zwettler
- & Jean-Philippe Brantut
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Kardar–Parisi–Zhang universality in a one-dimensional polariton condensate
Experiments show that the dynamics of phase fluctuations in a one-dimensional polariton condensate falls in the Kardar–Parisi–Zhang universality class, and theoretical analysis supports this finding revealing the key signatures of this universality class.
- Quentin Fontaine
- , Davide Squizzato
- & Jacqueline Bloch
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Realizing a 1D topological gauge theory in an optically dressed BEC
An optically coupled Bose–Einstein condensate of potassium atoms is used to engineer chiral interactions and perform the quantum simulation of a one-dimensional reduction of the topological Chern–Simons gauge theory.
- Anika Frölian
- , Craig S. Chisholm
- & Leticia Tarruell
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Evidence for unconventional superconductivity in twisted trilayer graphene
High-resolution scanning tunnelling microscopy and spectroscopy are used to provide evidence for unconventional superconductivity in magic-angle twisted trilayer graphene.
- Hyunjin Kim
- , Youngjoon Choi
- & Stevan Nadj-Perge
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Polariton Bose–Einstein condensate from a bound state in the continuum
Using a patterned waveguide, a Bose–Einstein condensate of polaritons is realized in a bound state in the continuum, with a low condensation threshold density that occurs at a dispersion saddle point.
- V. Ardizzone
- , F. Riminucci
- & D. Sanvitto
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Observation of ultracold atomic bubbles in orbital microgravity
Bubbles of ultracold atoms have been created, observed and characterized at the NASA Cold Atom Lab onboard the International Space Station, made possible by the microgravity environment of the laboratory.
- R. A. Carollo
- , D. C. Aveline
- & N. Lundblad
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Domain-wall dynamics in Bose–Einstein condensates with synthetic gauge fields
The creation of density-dependent gauge fields in an ultracold atomic system is described, leading to formation of domain walls that behave as elementary excitations and respond to electric fields, enabling a path to simulating gauge physics.
- Kai-Xuan Yao
- , Zhendong Zhang
- & Cheng Chin
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Article |
Crystallization of bosonic quantum Hall states in a rotating quantum gas
Spontaneous crystallization of atoms occurs in a rotating ultracold Bose–Einstein condensate occupying the lowest Landau level, behaviour that is related to a quantum hydrodynamic instability driven by shear forces.
- Biswaroop Mukherjee
- , Airlia Shaffer
- & Martin Zwierlein
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Article
| Open Access
Quantum gas magnifier for sub-lattice-resolved imaging of 3D quantum systems
Existing techniques for high-resolution imaging of trapped quantum gases are limited to two-dimensional systems, but the approach described here works in three dimensions by magnifying the quantum gas with matter wave optics.
- Luca Asteria
- , Henrik P. Zahn
- & Christof Weitenberg
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An optical lattice with sound
An optical lattice for trapping a Bose–Einstein condensate reported here includes photon-mediated atom–atom interactions that replicate acoustic modes in real crystals.
- Yudan Guo
- , Ronen M. Kroeze
- & Benjamin L. Lev
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Article |
Strongly correlated excitonic insulator in atomic double layers
So far only signatures of excitonic insulators have been reported, but here direct thermodynamic evidence is provided for a strongly correlated excitonic insulating state in transition metal dichalcogenide semiconductor double layers.
- Liguo Ma
- , Phuong X. Nguyen
- & Jie Shan
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Article |
Single-photon nonlinearity at room temperature
Nonlinearity induced by a single photon is desirable because it can drive power consumption of optical devices to their fundamental quantum limit, and is demonstrated here at room temperature.
- Anton V. Zasedatelev
- , Anton V. Baranikov
- & Pavlos G. Lagoudakis
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Two-dimensional supersolidity in a dipolar quantum gas
Two-dimensional supersolidity is demonstrated using highly magnetic, ultracold dysprosium atoms.
- Matthew A. Norcia
- , Claudia Politi
- & Francesca Ferlaino
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Article
| Open Access
Evidence for an atomic chiral superfluid with topological excitations
A globally chiral atomic superfluid is induced by time-reversal symmetry breaking in an optical lattice and exhibits global angular momentum, which is expected to lead to topological excitations and the demonstration of a topological superfluid.
- Xiao-Qiong Wang
- , Guang-Quan Luo
- & Zhi-Fang Xu
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Article |
Observation of Bose–Einstein condensates in an Earth-orbiting research lab
A Bose–Einstein condensate prepared in low Earth orbit shows a free-expansion time greater than one second, demonstrating the advantages of a microgravity environment for such studies.
- David C. Aveline
- , Jason R. Williams
- & Robert J. Thompson
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Letter |
Evidence of high-temperature exciton condensation in two-dimensional atomic double layers
Condensation of interlayer excitons at temperatures above 100 kelvin is demonstrated in a van der Waals heterostructure consisting of two-dimensional atomic double layers of transition metal chalcogenides.
- Zefang Wang
- , Daniel A. Rhodes
- & Kin Fai Mak
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Letter |
The low-energy Goldstone mode in a trapped dipolar supersolid
Observation of the collective mode responding to the superfluid stiffness—the low-energy Goldstone mode—provides direct evidence for phase rigidity, which is a key signature of supersolidity in an ultracold quantum gas.
- Mingyang Guo
- , Fabian Böttcher
- & Tilman Pfau
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Letter |
Space-borne Bose–Einstein condensation for precision interferometry
A Bose–Einstein condensate is created in space that has sufficient stability to enable its characteristic dynamics to be studied.
- Dennis Becker
- , Maike D. Lachmann
- & Ernst M. Rasel
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Letter |
Collective emission of matter-wave jets from driven Bose–Einstein condensates
Sufficiently strong modulation of the interaction strength in a Bose–Einstein condensate induces inelastic atom–atom scattering and causes collective emission of matter-wave jets from the condensate.
- Logan W. Clark
- , Anita Gaj
- & Cheng Chin
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Letter |
A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates
Spin–orbit coupling in Bose–Einstein condensates creates a density modulation, which is a stripe phase with supersolid properties.
- Jun-Ru Li
- , Jeongwon Lee
- & Wolfgang Ketterle
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Letter |
Supersolid formation in a quantum gas breaking a continuous translational symmetry
A supersolid with continuous translational symmetry breaking along one direction is realized by symmetrically coupling a Bose–Einstein condensate to the modes of two optical cavities.
- Julian Léonard
- , Andrea Morales
- & Tobias Donner
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Letter |
Self-bound droplets of a dilute magnetic quantum liquid
A self-bound quantum droplet of magnetic atoms is observed in a trap-free levitation field.
- Matthias Schmitt
- , Matthias Wenzel
- & Tilman Pfau
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Letter |
Emergence of a turbulent cascade in a quantum gas
The gradual development of a turbulent cascade in a weakly interacting homogeneous Bose gas is observed on application of a periodic driving force.
- Nir Navon
- , Alexander L. Gaunt
- & Zoran Hadzibabic
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Letter |
Dependence of the critical temperature in overdoped copper oxides on superfluid density
The scaling law for the critical temperature and zero-temperature stiffness in an overdoped copper oxide semiconductor does not conform to the standard Bardeen–Cooper–Schrieffer description.
- I. Božović
- , X. He
- & A. T. Bollinger
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Letter |
Observing the Rosensweig instability of a quantum ferrofluid
WebSpontaneous translational symmetry breaking is experimentally observed in a dipolar Bose–Einstein condensate of dysprosium atoms, whereby an instability causes a spontaneous transition from an unstructured superfluid to an ordered arrangement of droplet crystals, which is surprisingly long-lived.
- Holger Kadau
- , Matthias Schmitt
- & Tilman Pfau
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Letter |
Observation of non-Hermitian degeneracies in a chaotic exciton-polariton billiard
In non-Hermitian systems, spectral degeneracies can arise that can cause unusual, counter-intuitive effects; here exciton-polaritons—hybrid light–matter particles—within a semiconductor microcavity are found to display non-trivial topological modal structure exclusive to such systems.
- T. Gao
- , E. Estrecho
- & E. A. Ostrovskaya
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Letter |
Observation of Dirac monopoles in a synthetic magnetic field
Dirac magnetic monopoles are created, directly imaged and identified in real space in the synthetic magnetic field produced by a spinor Bose–Einstein condensate.
- M. W. Ray
- , E. Ruokokoski
- & D. S. Hall
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Letter |
Coupling a single electron to a Bose–Einstein condensate
A single electron in a defined orbital is found to interact with a quantum many-body system through electron–phonon coupling.
- Jonathan B. Balewski
- , Alexander T. Krupp
- & Tilman Pfau
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Letter |
Microscopic observation of magnon bound states and their dynamics
Bound states of elementary spin waves (magnons) have been predicted to occur in one-dimensional quantum magnets; the observation of two-magnon bound states in a system of ultracold bosonic atoms in an optical lattice is now reported.
- Takeshi Fukuhara
- , Peter Schauß
- & Christian Gross
Observation and quantification of the pseudogap in unitary Fermi gases