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The quantum distance quantifies the similarity between two quantum states and plays a relevant role in the physics of flat bands, e.g. flat band superconductivity or Landau levels. The authors propose a construction scheme for tight-binding models hosting a singular flat band with a prescribed maximum quantum distance and establish a bulk-boundary correspondence between the quantum distance and the boundary modes.
Ultra-thin endoscopes based on multimode fibers can achieve cellscale imaging in deep tissues, but in-vivo imaging perturbs the fiber so it must be re-calibrated with access to a single end only. To circumvent the problem, the authors rely on neural networks and implement a single-ended recovery of the fiber’s transmission matrix.
Boundary time crystals are gaining attention due to their distinctive features like persistent oscillations at the thermodynamic limit. This work shows that the boundary time crystal phase transition can be exploited for quantum-enhanced sensitivity, which bridges many-body physics and quantum metrology and hence triggers broad interest in the condensed matter and quantum technology communities.
Heterodyne detection is vastly used to overcome the intrinsic electron spin lifetime limiting the spectral resolution in NMR experiments based on nitrogen vacancy platforms, but the application of this technique at high magnetic fields is yet a challenge. The authors introduce heterodyne detection method applicable at high magnetic fields.
Platicons microcombs can be generated in photonic molecules from a continuous-wave pump, but their spectrum is typically distorted. The authors observe the formation of a platicon microcomb using a photonic molecule realized with two coupled microcavities, resulting in engineered microcomb spectrum approaching the ideal single microresonator case.
Anisotropic environments affect the motion of many living organisms but studying these systems in a controlled environment can be challenging. We employ experiments using active granular particles on a striated substrate and use the theory of active Brownian motion to replicate and describe such anisotropic motility.
The quantum nature of the hydrogen lattice in superconducting hydrides can have crucial effects on the material’s properties. In this work, the authors focus on the low-pressure superconductor BaSiH8 and identify the structural change due to quantum ionic effects to be the main driving force in increasing the critical pressure of dynamic stability.
Quantum communications over long distances require the use of a modular structure composed of quantum repeater nodes, and color centers in diamond are a promising candidate to establish such nodes. The authors present an open cavity platform using SiV centers in nanodiamond as a spin-photon interface with a view to realizing a quantum repeater.
The realization of a continuous-wave room-temperature maser reinvigorated the maser as a platform for microwave research in a broad range of applications, yet the operative conditions are still non-optimized. The authors optimize the operating space of a maser using NV- centers in terms of quality factor of the resonator and spin-level-inversion.
Generative autoregressive neural networks have recently enjoyed both scientific and commercial applications in image and language generation tasks. This work presents an exact mapping of the Boltzmann distribution, ubiquitously used in statistical mechanics, of pairwise interacting spin systems as an autoregressive neural network, exemplified by applications in the Curie–Weiss and Sherrington–Kirkpatrick models.
Coherent phonons can modify the wavefunction topology of quantum materials, yet the implications for electron dynamics remain to be addressed. The authors use time-dependent approaches to simulate the effect of coherent phonons, induced by strong terahertz laser field, on the electronic carrier dynamics in the topological insulator Zirconium Pentatelluride.
Self-motile active matter particles form a motility-induced phase separation (MIPS) state for high density and activity. By introducing an infection that causes particles to become nonmotile, MIPS clustering can arise outside the MIPS regime and exhibits time-dependent patterning from MIPS to a wetting phase and a fragmented state.
High-order Van Hove singularities (hoVHSs) with power-law divergences in the density-of-states are drawing current interest mainly in context of two-dimensional (2D) twisted moiré materials. Using cuprate high-Tc superconductors as an example, here the authors illustrate complications that can arise in bulk materials in defining hoVHSs and the need to extend the definition of hoVHSs to include flat-band materials.
Non-reciprocal electronic transport in a superconducting device is known as superconducting diode effect, which has potential for dissipationless electronics and computing. Previously, conventional superconductors have been used. Here, authors present their findings of such an effect in devices based on an unconventional superconductor Sr2RuO4 that may break time reversal symmetry.
The authors provide an application of dynamical mean-field theory to the spin dynamics in strongly correlated electron systems showing the impact of dynamic electron-electron self-energies and vertex functions on the Larmor mode and damping processes. The results show the superior nature of the methodology against simpler random-phase approximation techniques.
Non-Hermitian physics expands the range of exotic features that can be explored in non-trivial topological systems and exceptional points play a prominent role. Here, the authors report a topological classification of the intersections of exceptional surfaces and predicted topologically protected edge states that arise from the intersections.
Fractionalisation is a key feature of quantum mechanics and one of the most well-known examples in a condensed-matter system is the fractional quantum Hall effect. Here, the authors consider spin fractionalisation in a cluster-based Haldane state of a spin-1/2 Heisenberg triangular tube theoretically showing that the spin-1/2 magnetisation can be further fractionalised to an approximate 1/4 spin under an applied magnetic field.
Superconducting spintronics has the potential to enhance device functionality by realising spin polarised supercurrents with greater coherence and reduced dissipation. Here, using ferromagnetic resonance, the authors investigate the temperature dependence of the Gilbert damping for the Fe layer of Nb/Fe/Nb and Nb/Cr/Fe/Cr/Nb stacks and the impact superconducting spin triplets have on the spin pumping behaviour.
Laser-plasma electron accelerators are ultracompact and come with an embedded betatron X-ray source with small source size and ultrashort pulse length. The authors combine the edge illumination-beam tracking technique with a compact plasma X-ray source and present a demonstration of multimodal imaging down to the femtosecond timescale.
Chimera states have a close relationship with brain functionality but how to understand them directly from brain functional networks is challenging. Here, using the method of eigenmode analysis, the authors report a condensation phenomenon of all eigenmodes of brain functional networks and show that the chimera states represent the condensation on lower eigenmodes.
