Wednesday, October 29, 2025: New Listings

Oct 30, 2025 by Admin 42 views

Unveiling Cutting-Edge Research: Wednesday, October 29, 2025

Welcome, science enthusiasts! Let's dive into the fascinating world of condensed matter physics, materials science, and related fields. This article presents a curated selection of new research papers published on Wednesday, October 29, 2025, exploring a wide array of topics, from novel 2D materials to advanced spintronics and superconductivity. Get ready to explore the forefront of scientific discovery!

2D Materials: Exploring the Frontiers of Flatland

2D materials continue to capture the imagination of scientists worldwide, with their unique properties and potential for revolutionary applications. The following studies delve into the exciting realm of two-dimensional systems:

Unlocking Dynamic Luminescent Mapping of pH with CQDs

Keywords: 2D, Materials Science
Summary: This research unveils a groundbreaking method for pH monitoring using carbon quantum dots (CQDs) derived from sustainable lignin. The approach combines green chemistry with an operator-friendly, low-cost solution for pH measurement, achieving remarkable sensitivity and reproducibility. The system allows for 2D luminescent imaging of pH distributions, eliminating the need for specialized equipment. This work highlights the potential of sustainable materials and innovative sensing technologies.

Identifying Geometric Third-Order Nonlinear Transport

Keywords: 2D, Topological
Summary: This study tackles the challenge of identifying geometric mechanisms in third-order nonlinear transport within disordered materials. The researchers developed a comprehensive theory accounting for geometric effects and disorder scattering. They found 12 unambiguous mechanisms, using a scaling law to identify geometric mechanisms in materials with and without time-reversal symmetry. This theory promotes nonlinear transport as a probe of geometric effects and phase transitions in quantum materials.

Non-equilibrium Correlation Effects in Spin Transport

Keywords: 2D, Spin, Magnetism
Summary: This research investigates non-equilibrium spin transport in the 2D ferromagnet Fe4GeTe2. The team developed a fully non-equilibrium ab initio method to explore transport. The results demonstrate that material-specific many-body non-equilibrium methods are essential for a complete understanding of spin transport in 2D ferromagnets.

Strain Engineering of van Hove Singularity

Keywords: 2D, Magnetism
Summary: This study achieves a van Hove singularity (vHs)-induced insulator-metal transition coupled with a ferromagnetic phase transition in quasi-2D SrRuO3 (SRO) superlattices through strain engineering. This approach establishes strain engineering as a promising platform for tuning vHss and resultant itinerant ferromagnetism of low-dimensional correlated quantum systems. The use of strain provides a new route to control quantum phases in electronic and magnetic behaviors.

Density-driven Scattering and Valley Splitting

Keywords: 2D, Spin
Summary: This research investigates scattering mechanisms and valley splitting in a high-mobility undoped Si-SiGe 2DEG. These results provide critical insights into scattering-dominated regimes and valley splitting in undoped Si-SiGe, advancing its potential for silicon-based quantum devices, offering an ideal platform for hosting quantum-dot spin-qubits.

Flat Bands in Ultra-wide Gap 2D Germanium Dioxide

Keywords: 2D, Exciton
Summary: This study investigates the electronic and optical properties of free-standing 2D germanium dioxide phases. The findings allow the design of flat band materials with ultra-large electronic gaps, making these materials promising for devices operating at higher voltages and temperatures than conventional semiconductor materials.

Magnetism: Delving into Magnetic Phenomena

This section explores various aspects of magnetism, from novel magnetic materials to the manipulation of magnetic properties:

Anomalous Enhancement of Magnetism by Nonmagnetic Doping

Keywords: Magnetism
Summary: This research reports an enhanced Er3+ magnetic moment resulting from nonmagnetic Lu3+ substitution in the honeycomb-lattice antiferromagnet ErOCl. The work reveals a physical pathway to effectively tune magnetic anisotropy via anisotropic lattice distortion induced by chemical pressure, demonstrating a distinct enhancement of magnetization. This is contrary to conventional expectations for magnetic dilution.

Evolution of Electronic and Magnetic Properties in Fe3Sn2

Keywords: 2D, Magnetism, Topological
Summary: This research explores the structural, electronic, and magnetic impacts of substitutional alloying within the ferromagnetic kagome metal Fe3Sn2. The incorporation of Mn repositions the flat bands relative to the Fermi level in a manner consistent with hole-doping. The ability to hole-dope this magnetic kagome metal provides a platform for tuning properties such as anomalous Hall and Nernst responses.

Tunable Magnetism in MnPS3

Keywords: Magnetism, van der waals
Summary: This research demonstrates that the magnetic properties of MnPS3 can be tailored through the intercalation of different guest molecules. The intercalation of different guest molecules leads to a transition from the pristine antiferromagnetic state to more complex magnetic textures, including a ferrimagnetic state. This approach opens the way to the use of partial intercalation to define regions with distinct magnetic properties within a single flake.

Spin: Exploring Spin-Related Phenomena

This section focuses on research that investigates spin-related phenomena in various materials:

Exact Nematic and Mixed Magnetic Phases

Keywords: Spin
Summary: This work focuses on a model exhibiting an order-by-disorder mechanism, giving rise to a mixed magnetic phase. The researchers characterize this nematic phase and analyze its stability, which represents the first realization of a q=0 long-range-ordered phase in a pyrochlore magnet characterized by two distinct order parameters.

Group Word Dynamics

Keywords: Spin
Summary: This study focuses on one-dimensional quantum spin chains whose nearest-neighbor interactions are random matrices that square to one. The density of states and two-point functions of the local energy density are approximately computed and consistent with the physics of a generic local Hamiltonian: Gaussian density of states and thermalization of energy density.

Magnetic Field-tuned Magnetic Order in CeAuBi2

Keywords: Spin
Summary: This research presents a detailed study of CeAuBi2, a strongly correlated antiferromagnet. The smoothed nature of the metamagnetic transitions in non-stoichiometric CeAuBi2 is well described by an Ising model with weak quenched disorder, suggesting that the presence of Au vacancies is sufficient to tune the critical behavior of magnetic order.

Observation of a Hebel-Slichter Peak

Keywords: Spin, Superconductivity, Topological
Summary: This study reports a pronounced Hebel-Slichter coherence peak in the zero-field nuclear quadrupolar resonance (NQR) spin-lattice relaxation rate of the topological crystalline superconductor LaNiGa2. The data are well-fit by a two-band singlet BCS-like pairing with two distinct gaps consistent with previous measurements. This raises doubts on the identification of non-unitary triplet-pairing with time-reversal symmetry breaking in this material.

Relativistic Spin-momentum Locking

Keywords: Spin, Altermagnet
Summary: This research considers orthorhombic YVO3 and hexagonal MnTe, showing that the spin-momentum locking differs among the three spin components, forming the relativistic spin-momentum locking. Despite small magnitudes in real space, the canted spin components contribute significant spectral weight in k-space, impacting k-space properties.

Ballistic Transport in 1D Rashba Systems

Keywords: Spin, Superconductivity, Topological
Summary: This work investigates, as a function of disorder, the normal state ballistic transport properties of nanowires with and without superconductors to provide guidance on how to experimentally estimate the level of disorder.

Spin-dependent Photoluminescence

Keywords: Spin
Summary: This work reports on the observation of PL modulation of CQDs by magnetic fields under ambient conditions. The magneto-PL contrast decreases in the presence of paramagnetic species, which is attributed to an increase in magnetic noise-induced spin relaxation in the CQDs.

Variational Calculations of the Excited States

Keywords: Spin
Summary: This research calculates the excited electronic states involved in the optical cycle preparation of a pure spin state of the negatively charged NV-defect in diamond using the HSE06 hybrid density functional. The results demonstrate how time-independent variational calculations of excited states using density functionals can give accurate results.

Development of a 10.8-eV Tabletop Femtosecond Laser

Keywords: Spin
Summary: This research reports the construction of a tabletop 10.8-eV femtosecond laser, achieving a high energy resolution and tunable polarization. This flexibility enables detailed studies of orbital and (pseudo)spin characteristics in quantum materials. It showcases its potential for elucidating complex phenomena in quantum materials.

Edge Magnetism in Colloidal MoS2 Nanoflakes

Keywords: Spin
Summary: This study investigates from first principles free-standing triangular MoS2 nanoflakes with sulfur-terminated, hydrogen-passivated edges, to probe intrinsic spin behavior at varying side lengths. The findings establish that the S-terminated, H-passivated triangular MoS2 nanoflakes are a stable and experimentally accessible platform for low-dimensional, next-generation spintronic devices.

Ultrastrong Magnon-Photon Coupling

Keywords: Spin, Superconductivity, Magnon
Summary: This study predicts the realization of ultrastrong coupling between magnons of antiferromagnets and photons in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies, from both quantum and classical perspectives. The coupling between magnon and photon is ultrastrong with the coupling constant $acksim$ 100 GHz.

Signatures of Superconducting Pairing

Keywords: Spin, Superconductivity
Summary: This study considers the Hubbard model on a triangular lattice describing the hole-doped moiré superlattice emerging in WSe2/WSe2 twisted homobilayer in the moderately correlated regime. In this view, we show that the superconductivity in the WSe2/WSe2 twisted homobilayer is likely to be induced by electronic correlations and has a mixed-symmetry character.

Quantum Geometric Magnetic Monopole

Keywords: Spin, Superconductivity
Summary: This study shows that the quantum geometry strongly favors magnetic-monopole fluctuations because of the Dirac point at the M point, which reveals that CeRh2As2 exhibits van Hove singularities and the Dirac point near the Fermi level, which are key signatures of strong-correlation effects and quantum geometry.

Phase-Rotated Altermagnets

Keywords: Spin, Altermagnet, Topological
Summary: This work explores a two-terminal configuration where a topological-insulator film is interfaced with two altermagnetic electrodes whose crystalline phases can be rotated independently. Overall, this symmetry-driven mechanism provides a practical and low-dissipation route to programmable topological transport via lattice rotation.

Bounds on Lorentz-violating Parameters

Keywords: Spin
Summary: This research presents a unified framework to constrain minimal SME coefficients using magnetically confined two-dimensional electron systems under a uniform magnetic field. The results show that scalar sectors (notably a0) are tightly constrained by state-of-the-art mu-eV-resolution probes.

Non-equilibrium Correlation Effects in Spin Transport

Keywords: Spin, Magnetism
Summary: This study investigates non-equilibrium spin transport through the 2D ferromagnet Fe4GeTe2, which shows that, while spin transport remains essentially single-particle under moderate bias, inelastic spin-dependent scattering of carriers with particle-hole excitations drives a distinctive hot-correlated electron regime.

Low-energy Magnons in α-MnTe

Keywords: Spin, Magnon, Altermagnet
Summary: This research reports high-field electron spin resonance studies of the altermagnetic material α-MnTe. At low temperatures, the AFMR mode is remarkably sharp, which indicates the enhanced effect of magnon-magnon interactions.

Charge Stripe and Superconductivity

Keywords: Spin, Superconductivity
Summary: This work demonstrates that the anisotropy of the interlayer spin-exchange directly governs the competition between these two phases, while the on-site interaction U plays a complex role in tuning both the charge stripe and superconductivity. Our work identifies the key factors driving charge stripe formation.

Crossover from Self-trapped Bound States

Keywords: Spin
Summary: This research maps out the complete transport phase diagram of the ferromagnetic Heisenberg-Kondo lattice model in two dimensions. We establish the boundary that separates the many-body polaronic window from traditional scattering and extract a universal form for the resistivity in the scattering regime. We suggest the origin of the `excess resistivity' in the polaronic regime.

Magnetic and Phononic Dynamics

Keywords: Spin
Summary: This research studies the metal-organic material (C5H9NH3)2CuBr4 (Cu-CPA), in which an explanation of the low-lying excitations depends crucially on a full understanding of both the spin and lattice subsystems. The phonon spectrum contains a highly localized mode at an anomalously low-energy around 2 meV.

Equilibrium Spin Polarization

Keywords: Spin
Summary: This work resolves the paradox by formulating a pseudo-Hermitian quantum framework in which structural chirality and electron correlations are sufficient to produce CISS observables. Chirality enters through a non-local metric that couples spin and spatial motion, leading to real spectra, unitary evolution, and thermodynamic consistency.

Density-driven Scattering

Keywords: Spin, 2D
Summary: This research investigates the scattering mechanisms and valley splitting in a high-mobility undoped Si-SiGe 2DEG, which provides an ideal platform for hosting quantum-dot spin-qubits, advancing its potential for silicon-based quantum devices.

Virtual Gates Enabled

Keywords: Spin
Summary: This research introduces a modular, graph-based simulator that acts as a digital surrogate for a semiconductor quantum dot device, where computationally expensive processes are accelerated using deep learning. They validate their approach through comparison with experiments on a double quantum dot.

Bonding Character as a Descriptor

Keywords: Spin, hBN
Summary: This research shows that an orbital-based descriptor can be used to rationalize and efficiently estimate HR factors. Combining this descriptor with a ground state deformation technique allows circumventing both excited state relaxation and full phonon calculations.

Memory-induced Long-range Order Drag

Keywords: Spin
Summary: This research shows that memory, in the form of slow degrees of freedom, can induce a phase of long-range order in locally-coupled fast degrees of freedom, producing power-law distributions of avalanches. Our simulations reveal that MILRO can indeed drag across the layers.

Excitons: Exploring Bound Electron-Hole Pairs

This section delves into the fascinating world of excitons, focusing on their interactions and properties:

Strong Quantum Interaction

Keywords: Exciton
Summary: This theoretical prediction investigates the interaction between polaritonic excitations arising from the coupling of a cavity photon mode with bound to continuum intersubband transitions. Our predictions indicate that this physics can give rise to giant quantum optical nonlinearities in the mid and far infrared, a spectral region that remains largely unexplored in quantum optics.

Magnons: Investigating Spin Waves

Magnons, the quanta of spin waves, play a crucial role in understanding magnetic materials. The following studies explore their behavior:

Ultrastrong Magnon-Photon Coupling

Keywords: Magnon, Superconductivity
Summary: This work predicts the realization of ultrastrong coupling between magnons of antiferromagnets and photons in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies.

Low-energy Magnons in α-MnTe

Keywords: Magnon, Altermagnet, Spin
Summary: This study reports on high-field electron spin resonance studies of the altermagnetic material α-MnTe. The AFMR mode exhibits a noticeable broadening with increasing temperature, indicating the enhanced effect of magnon-magnon interactions.

Superconductivity: Unveiling Superconducting Phenomena

Superconductivity, with its remarkable properties, continues to be a central focus of condensed matter research. The following studies explore various aspects of superconductivity:

Tailoring Superconductivity

Keywords: Superconductivity
Summary: This study investigates the impact of two-level systems (TLSs) on superconductivity, showing that these defects can either enhance or suppress the superconducting critical temperature, depending on their surface density and average frequency.

Beyond Random Phase Approximation

Keywords: Superconductivity
Summary: This research derives the normal and anomalous proper polarization functions and the screened Coulomb interactions in a two-dimensional superfluid electron-hole bilayer, including all first-order corrections beyond the Random Phase Approximation (RPA).

Enhanced Superconductivity

Keywords: Superconductivity, van der waals
Summary: This study shows a simple method for enhancing the superconducting transition in tens-of-nm thick 2H-TaS2 crystals contacted by gold electrodes through in-situ intercalation. Our findings pave the way for the integration of chemically tailored intercalation compounds in scalable quantum technologies.

Topological Materials: Exploring Topological Phases

Topological materials exhibit unique electronic properties that are robust against perturbations, making them promising candidates for future technologies. The following studies delve into this exciting field:

Chiral Gapped States

Keywords: Topological
Summary: This research proposes an operator generalization of the Li-Haldane conjecture regarding the entanglement Hamiltonian of a disk in a 2+1D chiral gapped groundstate.

Van der Waals Materials: Investigating Layered Structures

This section explores research related to van der Waals materials, which are of great interest due to their unique properties and potential applications:

Tunable Magnetism in MnPS3

Keywords: van der waals, Magnetism
Summary: The magnetic properties of MnPS3 can be tailored through the intercalation of different guest molecules. Notably, the insertion of four alkylammonium ions introduces different populations of Mn2+ vacancies, leading to a transition from the pristine antiferromagnetic state.

Enhanced Superconductivity

Keywords: van der waals, Superconductivity
Summary: This study shows a simple method for enhancing the superconducting transition in tens-of-nm thick 2H-TaS2 crystals contacted by gold electrodes through in-situ intercalation. Our findings pave the way for the integration of chemically tailored intercalation compounds in scalable quantum technologies.

Graphene: Exploring the Wonders of Carbon

This section highlights research focused on graphene, a material with exceptional properties:

Metallic Electro-Optic Effect

Keywords: Graphene
Summary: This research identifies an alternative EO mechanism in bulk metallic systems that arises from the interplay between Berry curvature and the orbital magnetic moment of Bloch electrons. This mechanism dominates in C3z-symmetric TDBG, where EO contributions originating from the Berry curvature dipole (BCD) are symmetry-forbidden.

hBN: Exploring Hexagonal Boron Nitride

This section focuses on research related to hBN, which is of great interest due to its unique properties and potential applications:

Bonding Character as a Descriptor

Keywords: hBN, Spin
Summary: This work shows that an orbital-based descriptor can be used to rationalize and efficiently estimate HR factors. This orbital-based descriptor can be potentially used in high throughput computational screening to identify ideal candidates of spin qubits and SPEs.

Altermagnets: Exploring a New Class of Materials

This section discusses research related to altermagnets, a new class of materials with intriguing properties:

Relativistic Spin-momentum Locking

Keywords: Altermagnet, Spin
Summary: This research considers orthorhombic YVO3 and hexagonal MnTe, showing that the spin-momentum locking differs among the three spin components, forming the relativistic spin-momentum locking.

Low-energy Magnons in α-MnTe

Keywords: Altermagnet, Magnon, Spin
Summary: This study reports on high-field electron spin resonance studies of the altermagnetic material α-MnTe. The AFMR mode exhibits a noticeable broadening with increasing temperature, indicating the enhanced effect of magnon-magnon interactions.

Conclusion

This collection of research papers provides a snapshot of the vibrant and dynamic fields of condensed matter physics and materials science. The studies presented here offer valuable insights and pave the way for future discoveries. We hope this overview has sparked your curiosity and inspired you to explore these exciting topics further. Stay tuned for more updates and discoveries in the world of science!