Explore the fascinating intersection where quantum materials meet the complexity of everyday environments in the Cond-Mat — Mes-Hall section. This field investigates how tiny particles behave when caught between the orderly world of single atoms and the chaotic nature of bulk matter, revealing the hidden rules that govern electricity, magnetism, and heat in novel substances.

Gist.Science brings these cutting-edge discoveries to you directly from arXiv, the leading repository for physics preprints. We process every new submission in this category as soon as it appears, offering both straightforward, plain-language explanations and deep technical summaries to help researchers and curious minds alike grasp the latest breakthroughs without getting lost in dense equations.

Below are the most recent papers in this dynamic area of condensed matter physics, ready for you to explore.

Phonon-driven decoherence of high-harmonic generation in the solid-state

This study demonstrates that in ultrapure silicon, high-harmonic generation yield increases at lower temperatures because thermally driven incoherent phonons act as a primary source of electron-hole decoherence that suppresses harmonic emission.

Saadat Mokhtari, Vedran Jelic, David N. Purschke, Shima Gholam-Mirzaei, Katarzyna M. Kowalczyk, David A. Reis, T. J. Hammond, David M. Villeneuve, André Staudte, François Légaré, Giulio Vamp (…)2026-04-10🔬 cond-mat.mes-hall

Multiscale morphology and contact mechanics of physisorbed Al and Cu nanoparticles

Using large-scale molecular dynamics simulations, this study reveals that physisorbed aluminum and copper nanoparticles exhibit distinct morphological and contact mechanics scaling behaviors that deviate from thermodynamic limits below a critical size of 3–6 nm, whereas larger particles display self-affine surface roughness and approach bulk-like properties.

Mykola Prodanov, Oleksii Khomenko2026-04-10🔬 cond-mat.mes-hall

Localization--non-ergodic transition in controllable-dimension fractal networks from diffusion-limited aggregation

This study reveals that while spectral properties of diffusion-limited aggregation fractals in 2D exhibit universal localization, those in 3D display a tunable localization-to-non-ergodic transition characterized by the emergence of critical states and a hierarchy of compact localized states as the fractal dimension increases.

Oleg I. Utesov, Alexei Andreanov, Tomasz Bednarek, Alexandra Siklitskaya, Sergei V. Koniakhin2026-04-10🔬 cond-mat.mes-hall

Type-I and Type-II Saddle Points and a Topological Flat Band in a Bi-Pyrochlore Superconductor CsBi2

By combining angle-resolved photoemission spectroscopy and first-principles calculations, this study reveals that the Laves-phase superconductor CsBi2 hosts a dispersionless topological flat band and coupled type-I and type-II saddle points that collectively generate a large electron density of states, offering a novel mechanism for enhancing many-body interactions in three-dimensional systems with strong spin-orbit coupling.

Yusei Morita, Yongkai Li, Yu-Hao Wei, Kosuke Nakayama, Zhiwei Wang, Hua-Yu Li, Takemi Kato, Seigo Souma, Kiyohisa Tanaka, Kenichi Ozawa, Jia-Xin Yin, Takashi Takahashi, Min-Quan Kuang, Yugui Yao, Taka (…)2026-04-10🔬 cond-mat.mes-hall

Interaction-driven transport in a non-degenerate mixture of Dirac and massive fermions at charge neutrality point

This paper presents a comprehensive theory demonstrating that in non-degenerate HgTe quantum wells at charge neutrality, the electrical conductivity exhibits a temperature-driven crossover from massless Dirac-dominated transport to a regime where Coulomb scattering with thermally excited massive holes induces a negative, non-Drude correction, thereby establishing the system as a tunable platform for studying interaction-driven transport without Galilean invariance.

Yuping Huang, O. V. Kibis, V. M. Kovalev, I. G. Savenko2026-04-10🔬 cond-mat.mes-hall

Layer-by-layer water filling in molecular-scale capillaries

This study reveals that water fills nanoscale capillaries in discrete molecular layers when the walls are flexible, whereas rigid walls lead to abrupt filling, demonstrating that wall compliance governs the transition between these regimes through the competition between deformation energy and oscillatory wall-water interactions.

Mingwei Chen, Jingshan Wang, Artem Mishchenko, Ivan Timokhin, Fengchao Wang, Andre K. Geim, Qian Yang2026-04-10🔬 cond-mat.mes-hall

Optical Hall absorption sum rule and spectral compensation in time-reversal-breaking moiré and Hofstadter systems

This paper establishes a first-frequency-moment optical Hall absorption sum rule for time-reversal-breaking systems, demonstrating that it vanishes for zero-field moiré topological bands while taking a universal value determined by magnetic flux in Hofstadter models, thereby providing a rigorous framework to link low- and high-frequency spectral contributions and diagnose Landau-level mixing.

Yixin Zhang, H. Huang2026-04-10🔬 cond-mat.mes-hall