# Research articles

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Article Type
Year
• ### Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5

Spectroscopic measurements show how the features of the band structure related to the kagome lattice in CsV3Sb5 contribute to the observed strongly correlated phases.

• Mingu Kang
• Shiang Fang
• Riccardo Comin
Article
• ### Ciliary beating patterns map onto a low-dimensional behavioural space

The beating of motile cilia arises from the collective action of hundreds of proteins. A study of the dynamics of cilia under different environmental and genetic conditions shows that the space of beating variations is low-dimensional.

• Veikko F. Geyer
• Jonathon Howard
• Pablo Sartori
Article Open Access
• ### Moist convection drives an upscale energy transfer at Jovian high latitudes

Infrared images of Jupiter taken by the Juno spacecraft reveal an energy transfer driven by moist convection. This mechanism is expected to enhance heat transfer, which might also be relevant to Earth’s atmosphere.

• Lia Siegelman
• Patrice Klein
• Giuseppe Sindoni
Article Open Access
• ### Observation of a reduced-turbulence regime with boron powder injection in a stellarator

In stellarators, turbulence is detrimental for the confinement of the plasma. In the Large Helical Device, a confinement regime with reduced turbulence and improved confinement is observed.

• F. Nespoli
• S. Masuzaki
• T. Morisaki
Article Open Access
• ### Restrictions on realizable unitary operations imposed by symmetry and locality

In systems with no symmetry, local operations can combine to make any unitary transformation across a whole quantum system, but if symmetries limit the allowed operations, they cannot all be generated using local transformations.

• Iman Marvian
Article
• ### Precise determination of the $$B_{\mathrm{s}}^0$$–$$\overline B_{\mathrm{s}}^0$$ oscillation frequency

The LHCb collaboration reports an improved measurement of the oscillation frequency of mesons consisting of a bottom quark and strange quark, which is then combined with previous results.

• R. Aaij
• C. Abellán Beteta
• G. Zunica
Article Open Access
• ### Degree-preserving network growth

Network models rarely fix the number of connections of each node during evolution, despite this being needed in real-world applications. Addressing this need, a new approach can grow scale-free networks without preferential attachment.

• Shubha R. Kharel
• Tamás R. Mezei
• Zoltan Toroczkai
Article
• ### Evidence for a monolayer excitonic insulator

Insulating states that are formed because of pairing between electrons and holes are known to exist in engineered bilayer structures in high magnetic fields. Now evidence suggests they can occur in a monolayer crystal at zero field.

• Yanyu Jia
• Pengjie Wang
• Sanfeng Wu
Article
• ### Evidence for equilibrium exciton condensation in monolayer WTe2

Exciton condensation has been observed in various three-dimensional (3D) materials. Now, monolayer WTe2—a 2D topological insulator—also shows the phenomenon. Strong electronic interactions allow the excitons to form and condense at high temperature.

• Bosong Sun
• Wenjin Zhao
• David H. Cobden
Article Open Access
• ### Riemannian geometry of resonant optical responses

The modern understanding of quantum transport relies on geometric concepts such as the Berry phase. The geometric approach has now been extended to the theory of optical transitions.

• Junyeong Ahn
• Guang-Yu Guo
• Ashvin Vishwanath
Article
• ### Probing quantum information propagation with out-of-time-ordered correlators

The complexity of many-body quantum states makes their evolution difficult to simulate with classical computers. Experiments on a 2D nine-qubit device demonstrate that the key properties of quantum lattices can be accessed by measuring out-of-time-ordered correlators.

• Jochen Braumüller
• Amir H. Karamlou
• William D. Oliver
Article
• ### Polar state reversal in active fluids

Active matter exhibits a plethora of collective phenomena in both biological and artificial systems. In a model system of colloidal rollers, polar states in active liquids can be controlled.

• Bo Zhang
• Hang Yuan
• Alexey Snezhko
Letter
• ### Moiré nematic phase in twisted double bilayer graphene

Observations of an electronic nematic phase in twisted double bilayer graphene expand the number of moiré materials where this interaction-driven state exists.

• Carmen Rubio-Verdú
• Simon Turkel
• Abhay N. Pasupathy
Article
• ### General construction and topological classification of crystalline flat bands

A general theoretical technique is introduced to identify materials that host flat bands. Applying topological quantum chemistry provides the generating bases for these flat bands in all space groups.

• Dumitru Călugăru
• Aaron Chew
• B. Andrei Bernevig
Article
• ### Bulk and edge properties of twisted double bilayer graphene

Twisted double bilayer graphene is predicted to be a topological insulator under certain conditions. Simultaneous bulk and edge measurements now show metallic transport with a bulk bandgap, suggestive of this prediction.

• Yimeng Wang
• Jonah Herzog-Arbeitman
• Emanuel Tutuc
Letter
• ### Enhancement of superexchange due to synergetic breathing and hopping in corner-sharing cuprates

Cuprates exhibit exotic states because of the interplay between spin, charge and orbital degrees of freedom. Ab initio calculations now show that a mechanism called orbital expansion plays a key role in the magnetic properties of cuprates.

• Nikolay A. Bogdanov
• Giovanni Li Manni
• Ali Alavi
Article Open Access
• ### Nonlinear interferometry beyond classical limit enabled by cyclic dynamics

Nonlinear interferometry based on time reversal enables entanglement-enhanced measurements without the need for low-noise detection. An alternative approach now exploits cyclic dynamics and shows performance beyond the standard quantum limit.

• Qi Liu
• Ling-Na Wu
• Li You
Article
• ### Bayesian parameter estimation using conditional variational autoencoders for gravitational-wave astronomy

A method for estimating the source properties of gravitational-wave events shows a speed-up of six orders of magnitude over established approaches. This is a promising tool for follow-up observations of electromagnetic counterparts.

• Hunter Gabbard
• Chris Messenger
• Roderick Murray-Smith
Article
• ### Measuring the capabilities of quantum computers

Evaluations of quantum computers across architectures need reliable benchmarks. A class of benchmarks that can directly reflect the structure of any algorithm shows that different quantum computers have considerable variations in performance.

• Timothy Proctor
• Kenneth Rudinger
• Robin Blume-Kohout
Article
• ### A superconductor free of quasiparticles for seconds

The performance of superconducting devices can be degraded by quasiparticle generation mechanisms that are difficult to identify and eliminate. Now, a small superconducting island can be kept quasiparticle free for seconds at a time.

• E. T. Mannila
• P. Samuelsson
• J. P. Pekola
Letter