Localization structure of electronic states in the quantum Hall effect Seye, A., and M. Filoche Physical Review B 112, no. 14 (2025)
Résumé: We investigate the localization of electronic states in the integer quantum Hall effect using a magnetic localization landscape (MLL) approach. By studying a continuum Schrödinger model with disordered electrostatic potential, we demonstrate that the MLL, defined via a modified landscape function incorporating magnetic effects, captures key features of quantum state localization. The MLL effective potential reveals the spatial confinement regions and provides predictions of eigenstate energies, particularly in regimes where traditional semiclassical approximations break down. Numerical simulations show that below a critical energy, states localize around minima of the effective potential, while above it they cluster around maxima—with edge effects becoming significant near boundaries. Bridging the gap between semiclassical intuition and full quantum models, the MLL offers a robust framework to understand transport and localization in disordered quantum Hall systems and extends the applicability of landscape theory to magnetic systems.
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Bottom-up iterative anomalous diffusion detector (BI-ADD) Park, J., N. Sokolovska, C. Cabriel, I. Izeddin, and J. Miné-Hattab Journal of Physics: Photonics 7, no. 4, 045027 (2025)
Résumé: In recent years, the segmentation of short molecular trajectories with varying diffusive properties has drawn particular attention of researchers, since it allows studying the dynamics of a particle. In the past decade, machine learning methods have shown highly promising results, also in changepoint detection and segmentation tasks. Here, we introduce a novel iterative method to identify the changepoints in a molecular trajectory, i.e. frames, where the diffusive behavior of a particle changes. A trajectory in our case follows a fractional Brownian motion and we estimate the diffusive properties of the trajectories. The proposed Bottom-up iterative anomalous diffusion detector (BI-ADD) combines unsupervised and supervised learning methods to detect the changepoints. Our approach can be used for the analysis of molecular trajectories at the individual level and also be extended to multiple particle tracking, which is an important challenge in fundamental biology. We validated BI-ADD in various scenarios within the framework of the 2nd anomalous diffusion challenge 2024 dedicated to single particle tracking. Our method is implemented in Python and is publicly available for research purposes.
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Non-linear coupling in two non-linear delayed acoustic resonators Reda, J., M. Fink, and F. Lemoult Journal of the Acoustical Society of America 158, no. 3, 2130-2137 (2025)
Résumé: Building on our previous work on a Hopf resonator that mimics the cochlear amplifier from Reda, Fink, and Lemoult [(2023). Europhys. Lett. 144(3), 37001], we now turn to the fact that the inner ear comprises thousands of such resonators, which interact through coupling mechanisms. To gain insight into these interactions, we investigate the coupling of two acoustic resonators with slightly detuned resonance frequencies, interacting through time-delayed feedback loops. By modulating the gain of the loop and the coupling strength, we demonstrate the emergence of frequency synchronization at low amplitudes and bifurcations leading to desynchronization at higher amplitudes. This tunable non-linear interaction offers insights into resonance phenomena in coupled systems, with potential implications for auditory modeling and complex acoustic systems.
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Transmission interference microscopy of anterior human eye Alhaddad S., , Ghouali W., Baudouin C., A. C. Boccara, and V. Mazlin Nature Communications 16, no. 1 (2025)
Résumé: Cellular imaging of the human anterior eye is critical for understanding complex ophthalmic diseases, yet current techniques are constrained by a limited field of view or insufficient contrast. Here, we demonstrate that Ernst Abbe’s foundational principles on the interference nature of transmission microscopy can be applied in vivo to the human eye to overcome these limitations. The transmission geometry in the eye is achieved by projecting illumination onto the posterior eye (sclera) and using the back-reflected light as a secondary illumination source for anterior eye structures. Specifically, we show that the tightly localized illumination spot at the sclera functions analogously to a closed condenser aperture in conventional microscopy, significantly enhancing interference contrast. This enables clear visualization of cells and nerves across all corneal layers within an extended 2 mm field of view. Notably, the crystalline lens epithelial cells, fibers, and sutures are also distinctly resolved. In patients, Fuch’s endothelial dystrophy - a major ophthalmic disease affecting 300 million people - is highlighted under a transmission contrast, providing complementary information to traditional reflection contrast. Constructed using consumer-grade cameras, the instrument offers a path toward broad adoption for pre-screening and surgical follow-up, as well as for diagnosing corneal infections in low-resource settings, where anterior eye diseases are most prevalent.
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Evidence for weak seismic attenuation in Mars’ deep mantle Li, J., J. Hua, T. P. Ferrand, L. Pou, Q. Huang, L. Allibert, H. Meng, H. Samuel, Z. Jing, W. Wang, T. Yang, and T. Zhou Communications Earth and Environment 6, no. 1 (2025)
Résumé: The present-day distribution of surface and subsurface water on Mars reflects a complex history of exchange between the planet’s surface and interior since its formation. Constraining the water content of the deep mantle is essential for estimating the planet’s total water budget and understanding its long-term geologic and hydrologic evolution. Yet, the abundance of water at depth remains loosely constrained. Here, we analyze seismic data from global tectonic marsquakes and meteorite impacts recorded by the InSight mission, and identify evidence for weaker attenuation in Mars’ deep mantle (500–1500 km), in contrast to Earth. This low attenuation likely reflects fundamental differences in mantle properties between the two planets, including water content, grain size, oxygen fugacity, and/or temperature. Isolating the role of water from other parameters is key to quantifying Mars’ deep water reservoir and provides new constraints on the volatile inventory and interior evolution of the red planet.
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Analog phase-sensitive time-reversal of optically carried radiofrequency signals Llauze, T., and A. Louchet-Chauvet Optics Letters 50, no. 16, 4874-4877 (2025)
Résumé: Achieving low-latency time-reversal of broadband radiofrequency signals is crucial for reliable communications in dynamic, uncontrolled environments. However, existing approaches are either digitally assisted—making broadband extension challenging—or limited to amplitude modulation. In this work, we report the very first, to our knowledge, experimental realization of a fully analog, phase-preserving time-reversal architecture for optically carried radiofrequency signals. The method exploits the exceptional coherence properties of rare-earth ion-doped materials and leverages the well-established photon echo mechanism, widely used in quantum technologies. While our demonstration is conducted with a modest bandwidth, we identify the fundamental cause of this limitation and propose solutions for future scalability.
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