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Reaching fundamental noise limits permits optimal extraction of spectroscopic information from an absorption measurement. Here, the authors demonstrate a quantum-limited spectrometer with which they can obtain an extremely accurate measurement of the excited-state hyperfine splitting in Cs.

The Landé factors govern all the spin-related basic phenomena and are the key parameters which guide spintronics applications. Here, Kirstein et al. demonstrate a universal dependence of the Landé factors on the bandgap energy of several perovskite materials.

By tuning graphene’s electronic density of states, the study shows electrode electronic structure—not just the electrolyte—dominates reorganization energy and thus controls outer-sphere electron-transfer rates at solid–liquid interfaces.

In geometrically frustrated magnets, long-range magnetic order is typically suppressed, whereas at the same time non-trivial spin correlations are observed. Using time-domain terahertz spectroscopy, the authors find evidence for extended quantum string-like excitations in the quantum spin ice material Yb₂Ti₂O₇.

Multilayer capacitors comprising a solid solution of two electrocaloric materials PbSc_0.5Ta_0.5O₃ and PbMg_0.5W_0.5O₃ are shown to maintain high B-site order and latent heat without needing an energetically expensive anneal, enabling efficient refrigeration across room temperature.

Two-dimensional (2D) metal halide perovskites exhibit efficient photoinduced emission at room temperature, but control over charge carrier transport remains limited. Here formamidinium-based layered 2D perovskites are developed with high predicted symmetry. The absence of octahedral distortion results in an exciton diffusion length of 2.5 µm.

Operating cavity-based spectrometers at low temperature has several advantages, such as improved sensitivity. Now, a cavity-enhanced spectrometer is demonstrated down to 4 K.

Vinyl acetate is an important polymer building block, but the mechanisms governing its catalytic production are not well understood. This study shows that dynamic palladium-acetate clusters determine catalyst efficiency and selectivity in vinyl acetate synthesis.

Alkaline-earth phenoxides show promise as optical cycling centres; however, their properties when connected to larger structures is unclear. Now it has been shown that their optical cycling remains efficient despite increasing molecular complexity, enabling the scaling of laser-coolable molecules toward larger structures and surface-bound quantum systems.

The authors present time-domain terahertz spectroscopy measurements on BaCo₂(AsO₄)₂, a promising 3d transition-metal-based quantum spin liquid candidate.

While phosphorene is an exciting new 2D material, techniques to produce it in large quantities in a stable, processable form are lacking. Here, the authors achieve this using liquid phase exfoliation and demonstrate the resultant nanosheets to be useful in a number of applications.

 The analytical workflow outlined in this study allows multiple crude reaction mixtures to be analysed simultaneously, with substantial reductions in method development and analysis time, and maximizes the chances of finding catalytic systems with broad substrate scope.

The dynamic susceptibility of the quantum spin ice material Yb₂Ti₂O₇ is probed by means of time-domain spectroscopic techniques, providing a handle on the conductivity of monopole excitations in this system.

The quark structure of the f₀(980) hadron is still unknown after 50 years of its discovery. Here, the CMS Collaboration reports a measurement of the elliptic flow of the f₀(980) state in proton-lead collisions at a nucleon-nucleon centre-of-mass energy of 8.16 TeV, providing strong evidence that the state is an ordinary meson.

Phase change alloys are used as components for optical data storage like DVD and Blue-Ray disks but many of their conductive properties are only known phenomenologically. This paper reports detailed band structure mapping of the prototype alloy GST-225 using photoemission spectroscopy, and the observation of a Dirac-like surface state above the Fermi level.

Strange metal behaviour of high-Tc superconductors, characterised by unconventional electrical and thermodynamic properties, still poses challenges for theory. Smit et al. report experimental features in the self-energy of a strange metal that are consistent with predictions by holographic theoretical methods.

The highest-quality JWST spectra reveal that little red dots are young supermassive black holes shrouded in dense cocoons of ionized gas, where electron scattering, not Doppler motions, broadens their spectral lines.

Positrons are key to the production of cold antihydrogen. Here the authors report the sympathetic cooling of positrons by interacting them with laser-cooled Be⁺ ions resulting in a three-fold reduction of the temperature of positrons for antihydrogen synthesis.

Observations of a fast X-ray transient reveal that it is a gamma-ray-burst explosion from a very distant galaxy that emits light with the wavelength necessary to drive cosmic reionization, the last major phase change in the history of the Universe.

A broadband multi-frequency Fabry–Pérot laser diode, when coupled to a high-Q microresonator, can be efficiently transformed to an ~100 mW narrow-linewidth single-frequency light source, and subsequently, to a coherent soliton Kerr comb oscillator.

Two-dimensional perovskites enable high efficiency in perovskite photovoltaics but compromise operational stability. Yaghoobi Nia et al. form two-dimensional perovskite co-crystals with neutral templating molecules, improving the stability of perovskite solar modules.

Halide perovskites have a variety of attractive feature such as high quantum yield, and tunable optical properties, combined with easy fabrication. Here, Kirstein et al demonstrate spin-mode locking in CsPb(Cl0.56Br0.44)3 lead halide perovskite nanocrystals embedded in a fluorophosphate glass matrix, and a hole spin lifetime extending into the microsecond range.

In this work, authors demonstrate defect engineering in heteroepitaxially deposited high-temperature superconducting thin-films on coated conductor substrates achieving significant performance enhancement in the critical current density and pinning force achievable in coated conductors.

Time crystals spontaneously produce periodic oscillations that are robust to perturbations. A time crystal phase with a long coherence time has now been produced using the electron and nuclear spins of a semiconductor sample.

A broad-wavelength 0.5–5.5 µm atmospheric transmission spectrum of WASP-39b, a 1,200 K, roughly Saturn-mass, Jupiter-radius exoplanet, demonstrates JWST’s sensitivity to a rich diversity of exoplanet compositions and chemical processes.

The behavior of confined water is relevant to biological, environmental, and technological systems. Here, researchers model hydrogen bonds as elastic dipoles in an electric field and precisely quantify hydrogen bonding in gypsum heterostructure with electrically tunable confined water.

The authors study epitaxial thin films of the pyrochlore-sublattice compound LiTi2O4 by RIXS and ARPES. They observe cooperation between strong electron correlations and strong electron-phonon coupling, giving rise to a mobile polaronic ground state in which charge motion and lattice distortions are coupled.

Materials that combine metallic behaviour with stable electric polarization are scarce despite being proposed in the 1960s. Here the authors engineer a perovskite heterostructure where 2D polar metallic behavior coexists with built-in electric polarization from the displacement of B-site titanium cations.

Despite remarkable optical properties in lead halide perovskites, spin control in these materials is largely unexplored. Herein Belykh et al. study the coherent spin dynamics of electrons and holes in cesium lead bromide perovskites, and evidence interaction of electron and lattice nuclear spins.

Doubly magic atomic nuclei — having a magic number of both protons and neutrons — are very stable. Now, experiments revealing unexpectedly large charge radii for a series of Ca isotopes put the doubly magic nature of the ⁵²Ca nucleus into question.

Recently, there has been great interest in studying plasmons in strange metals characterized by linear-in-temperature electrical resistivity. Schultz et al. report an EELS in transmission study of plasmons in Sr₂RuO₄, revealing unrenormalized behavior explained by resilient quasi-particles at high plasmon energy.

CD44 expressed by fibroblastic reticular cells in secondary lymphoid organs regulates trafficking of dendritic cells, and thus has an essential role in the priming of T cells and the adaptive immune response.

Frustration-induced dimensional reduction is manifested in lower dimensionality of magnetic correlations compared to that of the magnetic structure. Here the authors demonstrate the role of the uniform Dzyaloshinskii-Moriya interaction in the recently synthesized material Ca3ReO5Cl2 exhibiting dimensional reduction.

Understanding photo-physics giving rise to quantum beating oscillations in hybrid organic-inorganic perovskites aids their applications in spintronics and quantum information science. Here, authors demonstrate that quantum beatings observed in single crystal perovskite at cryogenic temperatures are originating from positive and negative trions.

Lévy flights, a form of random walk, are quite common in nature. However only macroscopic signatures, obtained by averaging over many steps, have been measured so far. Now, the individual steps are observed directly as light scatters in a hot atomic vapour.

Exciton–polariton condensates have garnered interest as a means to access macroscopic displays of quantum phenomena such as Bose–Einstein condensation and superfluidity. In this work, a direct measure of the polariton–polariton interaction is obtained.

Radical Fe^II/α-ketoglutarate-dependent halogenases are powerful biocatalysts for C–H functionalization. Here, the authors reveal the mechanistic basis for chemoselectivity in a lysine halogenase.

The electrochemical double layer is a key concept in chemistry, but its properties are hard to probe experimentally. Here, the authors use ambient pressure X-ray photoelectron spectroscopy to probe the electrochemical double layer potential profile at the solid/liquid interface, under polarization conditions.

Nuclear spins in solid-state systems present a promising platform for quantum information applications. Here the authors report evidence of the long-predicted entangled dark nuclear spin state via optical polarization of localized hole spins coupled to the nuclear bath in a lead halide perovskite semiconductor.

Vaccines inducing mucosal immunity may provide better protection from respiratory viruses. Here, Ykema et al. demonstrate the utility of a bivalent, mucosally delivered nanostructured lipid carrier-replicon vaccine for induction of mucosal and systemic immunity and protection against morbidity and mortality from H5N1 and H7N9 influenza.

Predicting properties at the interface of materials is crucial for advanced materials design. Here, the authors introduce a high-throughput computational framework, InterMatch, for predicting several properties of an interface by using the databases of individual bulk materials.

The large, low-albedo asteroids in the main belt between 3.0 au and 3.4 au share spectral characteristics and history with Ceres. Accreted in different parts of the outer Solar System, they might have been implanted into the main belt by the dynamic upheaval created by the giant planets’ instability.

A three-partite cluster state made of one semiconductor spin and two indistinguishable photons is generated from an InGaAs quantum dot embedded in a pillar microcavity. The three-partite entanglement rate is 0.53 MHz at the output of the device.