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The newly-synthesised α-RuI3 has a much-debated ground state. Here, the authors demonstrate, using angle-resolved photoemission spectroscopy, that RuI3 is a moderately correlated metal with an electronic band structure not having any in-plane symmetry, introducing the concept of pseudochirality to describe a similar band structure.
When an energetic charged particle or photon is incident on a material, matter-antimatter pairs, such as electron-positron pairs, can be created. Here, the authors successfully generate charge-neutral GeV electron-positron beams using a multi-petawatt laser via pair production from the bremsstrahlung gamma rays.
The use of nitrogen vacancy (NV) centers in diamond is a powerful approach for quantum sensing and can enhance the sensitivity of other techniques such as nuclear magnetic resonance (NMR). Here, the authors present a dynamic nuclear polarization technique, which enhances the efficiency of polarisation transfer from the NV centre at volumes suitable for NMR without being disrupted by other defects within the diamond.
Electronic state control using periodic light fields called Floquet engineering is a central topic in photophysics. The authors demonstrate an example of Floquet engineering, in which intramolecular vibrational excitation by a mid-infrared pulse in a molecular solid K-TCNQ induces a charge-spin modulated Floquet state synchronized with intramolecular vibration, destabilizing the spin Peierls phase.
Charge-4e transport could be useful for realizing parity-protected superconducting qubits. In this work, the authors demonstrated the controlled conversion between charge-2e dominated and charge-4e dominated supercurrent in a superconducting quantum interference device (SQUID) fabricated in an InAs two-dimensional electron gas proximitized by the vicinity to an epitaxial Al layer.
The reduced dimensions of 2D materials increase the strength of electron-electron correlations and hence they can be used as a platform to engineer exotic physical states such as Dirac semimetals. Here, using first-principles calculations, the authors investigate the mechanical properties of β12-B5H3, as well as possible Dirac semimetal and phonon-mediated superconducting phases.
The common probes for cold atoms systems are typically global and do not provide direct information on the local spatial structure of states, limiting the insight on disordered and quasiperiodic systems. The authors demonstrate a local probe able to distinguish metallic and insulating states in an energy-resolved manner.
Materials hosting magnetic rare-earth ions sitting on a two-dimensional triangular lattices are ideal candidates to realize spin liquid states. In this work, the authors synthesize a high-quality single crystal sample of an erbium based triangular lattice compound, that exhibits a mixture of ferromagnetic and antiferromagnetic behaviour.
In this work, metasurface-based perfect vortex beams (MPVBs) featuring topological charges (TCs) of −32 and 16 have been successfully manufactured. As one of the tremendous phenomena in quantum mechanics, the fancy optical eraser experiment by integrating these MPVBs has also been successfully demonstrated in this study.
The study of frustrated magnet systems has unveiled a range of novel physical phenomena and continues to attract interest for in fields such as quantum spin liquid theory and high-temperature superconductors. Here, the authors use ab-initio calculations and a spin-wave analysis to demonstrate that an order-from-disorder phenomenon contributes to the columnar antiferromagnet ordering of BaCoS2.
Narrow-gap semiconductors with gate-controllable spin-splitting provide an ideal platform for novel spintronic and topological devices. The authors observe a large spontaneous spin-splitting energy, reaching 18 meV and widely tunable by a gate voltage, in an InAs quantum well that is magnetically proximitized by a ferromagnetic semiconductor (Ga,Fe)Sb.
Migdal-Eliashberg theory is a method for describing conventional superconductors. Here, the authors present an implementation that goes beyond the widely used constant density of states approximation by accommodating scattering processes beyond the Fermi surface, and they show its importance in two classes of near room temperature superhydrides.
Impedance theory grants insight to design metasurfaces for controlling acoustic fields, but such theory imposes great limitation on boundary conditions. The authors propose a generalized acoustic impedance theory connecting arbitrarily conservative acoustic fields, and design a beam splitter as an example of power flow processing.
A Chern insulator has non-trivial bulk topology with a quantized Chern number defined in the Brillouin zone (BZ), yielding robust gapless edge states. The authors introduce the concept of reduced Chern number, defined in subregions of the BZ, and construct a family of Chern dartboard insulators with quantized reduced Chern numbers but trivial bulk topology, exhibiting distinct pseudospin textures.
The turbulent skin friction drag at the solid/liquid interface results in high electric energy consumption when conveying liquids through hydraulic networks, and efficient drag reduction strategies are still unavailable. The authors coat a channel with a magnetic fluid film and achieve almost complete wall drag reduction of up to 90% across laminar and turbulent flow regimes.
Most physics-informed deep learning models alleviate the poor generalizability of pure data-driven models by minimizing residuals of the governing equations. In this work the authors propose to leverage physics priors, by embedding the discretized governing equations into the neural network architecture, which improves the generalizability and long-term prediction accuracy.
Reservoir computing (RC) is energy-efficient due to its simple architecture, allowing physical implementation. The proposed self-modulated RC extends the capabilities of RC, exhibiting superior learning abilities and complex dynamics, including attention and chaos, while retaining the advantage of physical implementation.
One main obstacle of flow cytometry techniques is the inability to image internal structure of live cells on the go, posing challenges in deciphering their biological mechanisms. To overcome this limit, the authors devise a light-sheet-based multichannel, multisheet and multicolor volume imaging cytometry for interrogating cells flowing simultaneously through microfluidic channels.
Understanding the thermal transport properties of tungsten nitrides formed on the divertor surface of the tokamak is crucial, as they will be subjected to continuous heat flux. In this article, the authors theoretically calculated the influence of vacancy defects on the electrical and thermal conductivities of tungsten nitrides, providing an understanding of the mechanism behind the effects in terms of electron behavior.
Generating ultrashort spectrally tunable pulses via high-harmonic generation (HHG) enables matching the excitation photon energy to the characteristic resonance of the sample to study its ultrafast dynamics. The authors demonstrate a compact continuously tunable high-intensity VUV HHG source that can rival state-of-the-art seeded FELs.
