Harnessing the Quantum Nature of Light and Matter at the Nanoscale
![Polariton dispersion reveals a complex interplay between light and matter, where the coupling of excitons and photons-illustrated by the [latex]\Omega_{k_\parallel}[/latex] relationship-creates hybrid light-matter quasiparticles whose electronic and photonic character-quantified by [latex]\eta_{\mathbf{k}_\parallel}^{\mathrm{el}}[/latex] and [latex]\eta_{\mathbf{k}_\parallel}^{\mathrm{ph}}[/latex]-is strongly dependent on momentum, ultimately influencing the population of plasmons in the ground state as described by the anomalous Hopfield coefficient [latex]|x_{\mathbf{k}_\parallel}|^2[/latex] and its asymptotic behavior in the quasistatic limit [latex]k_\parallel \gg \omega_p/c[/latex].](https://arxiv.org/html/2601.11297v1/x5.png)
A new theoretical framework clarifies the fundamental interactions between light and matter in nanophotonic systems, revealing regimes of exceptionally strong coupling.
Science
Antineutrons: Unlocking the Mysteries of Matter-Antimatter Annihilation
![The study demonstrates a quantifiable relationship between antineutron momentum and atomic number as manifested in the measured annual modulation signal [latex]\sigma_{ann}(p_{\bar{n}}; A)[/latex], providing insight into the underlying physics of this phenomenon as detailed in reference [13].](https://arxiv.org/html/2601.11390v1/fig61_pr.png)
A new review examines the surprisingly incomplete understanding of antineutron interactions and charts a course for future experiments at CERN.
Whispers of Gravity: A New Era for Tabletop Experiments
Researchers have crafted a highly sensitive torsion pendulum using nanofabrication techniques, opening new avenues for probing fundamental gravitational effects on a laboratory scale.
Whispers Between Billiards: How System Coupling Shapes Quantum Chaos
![The study demonstrates how the distribution of nearest-neighbor spacing, quantified by [latex] P(s) [/latex] and its cumulative form [latex] I(s) [/latex], transitions from Poissonian behavior for weakly coupled systems to characteristics mirroring Gaussian Orthogonal Ensemble (GOE) random matrices with increasing coupling strength, as validated by a comparison between experimental data and COMSOL Multiphysics computations.](https://arxiv.org/html/2601.11212v1/x19.png)
New research demonstrates that even subtle connections between quantum systems exhibiting predictable and unpredictable behavior fundamentally alter their spectral fingerprints.
Simulating the Quantum World: A Deep Dive into Materials Spectroscopy
This review explores the powerful capabilities of the ‘exciting’ code for accurately modeling the electronic and optical properties of materials.
Quark Matter’s Stickiness: Unraveling Viscosity Across Phase Boundaries
New research delves into the complex viscous properties of quark matter, revealing how its resistance to flow changes as it transitions between different states.
Mirror Images in the Nucleus: Unveiling Carbon-10 and Beryllium-10
![Proton density distributions were mapped for representative configurations of the [latex] ^{21}_{+2}\_{1} [/latex] states in both [latex] ^{10}Be [/latex] and [latex] ^{10}C [/latex], revealing the influence of deformation parameters β and squared overlaps - quantified as percentages - on nuclear structure.](https://arxiv.org/html/2601.10172v1/x7.png)
New research reveals subtle differences in the quadrupole transitions of carbon-10 and beryllium-10, challenging expectations of perfect isospin symmetry in these exotic nuclei.
Beyond Minimum Coherence: Tighter Bounds for Wave Behavior
A new theory leverages the full spectrum of wave coherence-from its weakest to strongest points-to establish universally optimal limits on observable wave characteristics.
Quarkonium’s Fate in Extreme Conditions
New research explores how hot, dense matter and magnetic fields affect the stability of heavy quarkonium particles.
Frozen in Time: Universal Localization in Dynamic Systems
New research reveals a surprisingly robust form of localization where the dynamic response of a system becomes independent of its initial conditions and underlying structure.