Research articles

Current Rydberg quantum processors suffer from limitations in fidelity and scalability. Here, the authors address these limitations by proposing highly controllable multi-qubit operations that utilize the Fermi scattering of Rydberg electrons trapped in an optical lattice.

Precise modelling of solar cells devices under various conditions is essential to guide improvements in optimisation and performance of future technologies. Here, the authors present a holistic numerical model, verified with real-world data of thin-film CIGS modules, that can conduct loss analysis and predict the energy yield of thin film solar cells.

Electron-phonon coupling plays a fundamental role in the properties of conventional superconductors and is typically understood using BCS theory. Here, the authors study electron-phonon dynamics in the weak-coupling regime of Eliashberg theory identifying the similarities and differences between the two models in the dirty limit.

Fast and high-resolution Fourier transform spectrometers are indispensable for cutting-edge infrared spectroscopy. In this study, the authors employed a newly-designed fast-rotating retroreflective, broadband delay line demonstrating fast dual-comb spectroscopy with a single mid-infrared optical comb from a quantum cascade laser emitting at 8 micrometers.

“Previous studies investigating the creation of optical frequency combs through parametric modulation of microresonators rely on lumped-element models that do not consider how the modulations are spatially distributed. The current study underscores the crucial role of these spatial distributions in SNAP bottle microresonators, particularly in producing optical frequency combs with low repetition rate.

Spin dynamics induced by intense terahertz pulses are commonly observed by magnetooptical effects. Here, we show that magnetorefractive effect provides a second-harmonic magnon signal whose amplitude is comparably strong with the linear component, making it an efficient probe for detecting the inherent nonlinear spin dynamics in orthoferrites.

Energy and charge transfer processes like Interatomic Coulombic Decay (ICD) play an important role in the relaxation of excited atoms or molecules in dense media such as biological tissue. Here, we present a method to experimentally determine the site-specific efficiency of the ICD process, which is in quantitative agreement with theoretical calculations.

It is established that topological spin textures are a rich source for emergent physical properties; it remains a major challenge, however, to unravel their local structure and topological connections. Here, the authors apply X-ray vector magnetic tomography to gain insight into the magnetic structure near Bloch points at permalloy microstructures and identify several topological monopoles and dipoles within the domain wall core.

For decades hole dynamics were thought to be invisible in the transient spectroscopy of quantum dots. Here, the authors use a combination of time and frequency resolution of 2D electronic spectroscopy to reveal previously unobserved hole dynamics and rationalize these dynamics from a conceptual transition from continuum to atomistic theories of quantum dot excitonics.

Borophene, a single layer of boron atoms, has many of the exotic properties of its better-known cousin graphene. Here, the authors use ab initio calculations to understand the atomic origin of the tilt in the two-dimensional Dirac cone of 8Pmmn borophene, thereby suggesting atomic substitutions to vary the tilt.

Realising a topological superconductor with non-Abelian excitations is a central goal for the development and application of topological qubits. Here, the authors theoretically predict the emergence of intrinsic non-Abelian topological superconductivity that occurs when a ‘maximal’ twist angle of 30 degrees is introduced between two layers of a topologically trivial spin-triplet valley-singlet superconductor.

Motivated by the recent discovery of superconductivity in infinite layer nickelates, the authors study the correlation and temperature phase diagram of LaNiO₂ and NdNiO₂, using embedded DMFT combined with DFT. Their study offers insight into the low-energy physics of the paramagnetic and magnetic states, shedding some light on the mechanism of superconductivity and lack of magnetic order in these systems.

Capillary rise is a process whereby a liquid spontaneously rises against gravity within a narrow space due to capillary forces; but even though it is a well-understood phenomenon in smooth channels, predictive models to account for surface roughness are lacking. Here, the authors develop a theory of capillary rise in textured channels, supported by simulations and experiments, demonstrating the complex interplay between channel width, texture and wettability.

Non-equilibrium states can be induced in a given system using periodic driving and the underlying physics understood using Floquet theory. Here, the authors model a periodically driven t2g-orbital metal and demonstrate how the spin Hall and anomalous Hall effects are realized and can be distinguished by their response to circularly polarized light with different helicities.

Low-dimensional systems that host Dirac-like physics are of considerable interest, and attention is turning to platforms with increasingly complex symmetries as a way of realizing more exotic and novel features. Here, the authors consider Dirac states in a lattice with non-symmorphic symmetries termed a herringbone lattice and, using a tight-binding model, calculate the associated spectral properties.

Time-resolved spectroscopies at ultrafast timescales are a powerful tool for understanding the properties of a Mott insulator on a square lattice. Here, the authors theoretically investigate the transient magnetic dynamics in a photoexcited half-filled Hubbard model and identify an increase in the two magnon weight of the Raman scattering as an exciton-assisted magnetic excitation.

Despite a significant amount of research, there are still many unknowns about the underlying mechanisms of the superconductivity in Fe-based superconductors, in particular the roles of magnetism and nematicity. Here, the authors investigate the compositional dependence of the nematic susceptibility in Fe_1+yTe_1−xSe_x and the interplay between nematic and spin fluctuations, as well as the effect of orbital differentiation on nematic instability.

Understanding the interplay between superconductivity and magnetism has been a longstanding challenge in condensed matter physics. Here, the authors uncover a sensitive coupling between the two within the pressure-tuned phase diagram of EuTe₂ and find that certain magnetic orders can stabilize conventional superconductivity far exceeding the Pauli limit.

Obtaining a Hamiltonian that produces desired physical properties is important in materials design, that is, however, a highly nontrivial process since the parameter space is usually unknown a priori. Here, the authors present a general theoretical framework based on the inverse problem that uses automatic differentiation to construct a Hamiltonian with the desired physical properties.

Magnetic molecules have chemically tunable electronic states that could be used for quantum technologies, but they are often surrounded by a nuclear spin bath causing decoherence. In this study, the authors experimentally investigate the electron-nuclear coupling approaching the clock transition and develop a simple theoretical model which gives a good qualitative understanding of the observed dynamics.