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High-temperature behaviour of thermopower is special in cuprates, allowing for theory-experiment comparisons. Wang et al. use quantum Monte Carlo to compute high temperature thermopower in the Hubbard model, demonstrating qualitative and quantitative agreement with experiments across multiple cuprate families.

Here, the authors introduce a cryogenic scanning probe photoelectrical sensing technique, termed exciton-resonant microwave impedance microscopy, to measure the excitonic responses in monolayer MoSe2 and identify exciton polarons and their Rydberg states.

An Fe^III/V redox mechanism in Li₄FeSbO₆ on delithiation without Fe^IV or oxygen formation with resistance to aging, high operating potential and low voltage hysteresis is demonstrated, with implications for Fe-based high-voltage applications.

The authors present ARPES measurements on the triple-layer cuprate superconductor Bi₂Sr₂Ca₂Cu₃O_10+δ. They find that, although the doping level of the inner CuO₂ plane is extremely low in under-doped samples, the d-wave superconducting gap is enhanced at the antinode and persists well above T_c without a Fermi arc, indicating a “nodal metal”.

Riffelmacher et al. show that immunization with a live vaccine strain leads to the expansion of two memory-like mucosal-associated invariant T cell lineages with distinct metabolic needs, effector programmes and protective capacities.

Photoelectron spectroscopy measurements uncover a singularity over a wide doping range in the cuprate superconductor Bi₂Sr₂CaCu₂O_8+δ, suggesting a competition between the charge-ordering and the superconducting phases.

Silicon-vacancy (SiV) centers in diamond are emerging as promising quantum emitters for various applications. Here, authors devised a novel pulsed annealing scheme that improves the conversion efficiency of SiV centers in diamond.

The origin of the charge density wave in vanadium antimonides has been widely debated. Here, the authors report the cooperation of electron-phonon and phonon-phonon coupling for the formation of the charge density wave in CsV₃Sb₅.

Diamondoids are a series of hydrogen-terminated nanometer-sized hydrocarbons that can be used to synthesize high-quality diamond crystals. Here, the authors use Monte Carlo simulations to study the potentials of different diamondoids in constructing diamond crystals with the assumption that the carbon skeletons keep intact, and find that higher diamondoid molecules are most suitable.

Unconventional superconductivity is often associated with the presence of other kinds of electronic order. Observations of charge order in infinite-layer nickelate superconductors show that they fit this pattern.

A combination of photoemission and scanning tunnelling spectroscopy measurements provide compelling evidence that single layers of 1T'-WTe₂ are a class of quantum spin Hall insulator.

Over the last few years, several van der Waals materials have been found that retain magnetic ordering down to monolayer thickness. These materials provide a simple platform for studying the magnetism in reduced dimensions. Here, Zhong et al study the thickness dependence of magnetic ordering in Cr2Te3, and find a crossover from Stoner to Heisenberg-type magnetism as thicknesses are reduced.

Signatures of an excitonic insulator have been reported in several two-dimensional materials. Here the authors report electronic properties of monolayer ZrTe₂ from ARPES and STM measurements that are consistent with the preformed exciton gas phase, a precursor for the excitonic insulator.

Transition metal dichalcogenides offer a platform to study light-matter interaction in atomically thin semiconductors. Here, the authors perform ab initiocalculations to illustrate the possibility of optical control of chiral edge modes, outlining a strategy to manipulate topological states.

A technique analogous to angle-resolved photoemission spectroscopy used in materials characterization has been developed for interacting Fermi gases in an optical lattice, providing information on the single-particle excitations in a many-body system.

Recent photo-emission experiments reported a strong nearest-neighbour attraction in a 1D cuprate, possibly originating from long-range electron-phonon coupling. By using state-of-the-art numerical methods, the authors show that a Hubbard model with extended electron-phonon terms reproduces experimental features.

A distorted infinite-layer lattice of single-crystal CaCoO₂ originates from competition between an ordered Jahn–Teller effect and geometric frustration.

Observation of a faint Fermi surface inside the pseudogap of an electron-doped cuprate suggests that Cooper pairing is mediated by antiferromagnetic spin fluctuations.

Inorganic lead halide perovskites are structurally unstable, which prevents their application in solar cells. Here the authors synthesize, using high pressure and temperature, a perovskite CsPbI₃ phase that is metastably preserved to ambient conditions through a structural deformation induced at high pressure.

Photoemission studies in the pseudogap state of a cuprate superconductor show differences depending on whether a particle is added or removed, revealing broken translational symmetry. Moreover, this particle–hole asymmetry coincides with the opening of the pseudogap.

A high-precision angle-resolved photoemission spectroscopy (ARPES) study on the superconductor Bi2212 resolves the spectroscopic singularity associated with the superconducting transition temperature, and indicates that the transition is driven by phase fluctuations.

The use of diamondoids as structure-directing agents allows the synthesis of metal–organic chalcogenide nanowires with an inorganic core having a three-atom cross-section and band-like conductivity.

Exotic quantum phases like spin liquids have long been investigated theoretically but it is difficult to find materials that realize these states in equilibrium. Here the authors propose that optical driving could be used to induce chiral spin liquid behaviour in frustrated Mott insulators.

Electrons in PdCoO₂ can travel a long way before being scattered, and their band structure is such that they can travel in only one of three directions. As a result, the current flow through this nanoscale conductor can be very efficient.

Terahertz light pulses induce transitions between a topological and a trivial phase in the Weyl semimetal WTe₂ through an interlayer shear strain.

A memory device is proposed that uses a dynamical modification of the stacking order of few-layer WTe₂ to encode information. The change in stacking modifies both the Berry curvature and the Hall transport, allowing two states to be distinguished.

The superconducting energy gap is perhaps the best-known of the spectral gaps in a superconductor, but there are many other types, including density waves and the mysterious pseudogap. This Review Article surveys what angle-resolved photoemission spectroscopy has revealed about the various gaps.

The manipulation of spins with ultrafast lasers is a promising route to control the properties of a wide variety of quantum materials. Here, the authors present a simulation of Floquet-engineered spin fluctuations in a correlated system and of their fingerprints in ultrafast inelastic X-ray scattering experiments.

Photon spectroscopies provide insight into a wide range of materials. In this Review, theoretical and computational efforts to understand, simulate and predict the results of photon spectroscopies are assessed for systems both in and out of equilibrium, with a focus on advances that reveal information about correlated materials.

The Hofstadter–Hubbard model on 2D square lattices is a paradigmatic model to study the interplay of electron correlations and external magnetic field. The authors use quantum Monte Carlo to study the thermodynamic properties of the Hofstadter Hamiltonian at intermediate to strong coupling, finding that a strong orbital magnetic field delocalizes electrons and reduces the effective Hubbard interaction.

The emergence of quasiparticles in a doped Mott insulator is the key to understanding high Tc cuprate superconductivity - a major quest in condensed matter physics. Here, the authors investigate the angle-resolved photoemission spectroscopy in the cuprates and observe how the quasiparticle emerges from the Mott insulating regime.