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        <title>Frontiers in Physics | Condensed Matter Physics section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/physics/sections/condensed-matter-physics</link>
        <description>RSS Feed for Condensed Matter Physics section in the Frontiers in Physics journal | New and Recent Articles</description>
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        <pubDate>2026-05-10T23:17:08.955+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1770329</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1770329</link>
        <title><![CDATA[Orthorhombic SrVSi2O7 as a potential magnetic second-order topological insulator with spin-polarized hinge states]]></title>
        <pubdate>2026-04-07T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Yang Li</author><author>Xiang Han</author>
        <description><![CDATA[Three-dimensional second-order topological insulators (3D SOTIs) have attracted considerable attention in recent years; however, realistic material realizations to date are overwhelmingly restricted to nonmagnetic systems. In this work, based on first-principles calculations, we demonstrate that bulk SrVSi2O7—an experimentally realized material with an orthorhombic crystal structure—is an intrinsic 3D ferromagnetic SOTI. We find that the nontrivial bulk band gap and the associated fractional topology are exclusively carried by the spin-up channel. For SrVSi2O7, the spin-up channel hosts a quantized fractional topological charge (Q(2) = e/2), whereas the spin-down channel remains topologically trivial (Q(2) = 0). Consistent with the higher-order bulk–boundary correspondence, SrVSi2O7 is confirmed to host topologically protected and ultra-clean hinge states exclusively in the spin-up channel, well isolated from the bulk bands. Distinct from previously reported nonmagnetic 3D SOTIs, the hinge states in SrVSi2O7 are intrinsically spin polarized, highlighting its potential as a platform for topological spintronic applications.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1783199</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1783199</link>
        <title><![CDATA[Theories on classical electromagnetic metamaterials]]></title>
        <pubdate>2026-03-17T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Boli Xu</author><author>Renbin Zhong</author>
        <description><![CDATA[Metamaterials, which are artificially engineered materials, have significantly expanded the possibilities of wave manipulation. Rapid advancements in metamaterial design and fabrication have fostered a flourishing field and have established a solid foundation for theoretical research. Theoretical studies on metamaterials not only drive the advancement of the field itself, but also offer new opportunities for gaining deeper insights into the fundamental nature of electromagnetic waves and provide a novel platform for probing the intrinsic properties of natural materials. This review systematically summarizes the fundamental theories of metamaterials, including those that describe electromagnetic wave propagation inside and outside metamaterials, as well as those used to determine their effective electromagnetic parameters. Taking metamaterial fundamental theory as the central perspective, this study examines the underlying assumptions, inherent limitations, interrelationships among different theories, and both current advances and potential future developments. The purpose of this review is to organize and delineate the theoretical foundations of metamaterials, thereby outlining the overall landscape of metamaterial theory and facilitating the establishment of a comprehensive and coherent theoretical framework. In addition, this review serves as a useful reference for newcomers in the field, helps experienced researchers identify gaps or overlooked aspects, and provides researchers from related disciplines with insights into potential avenues for interdisciplinary integration.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1764641</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1764641</link>
        <title><![CDATA[Symmetry, bonding, and wannier function construction in the PF6− molecule: a first-principles case study]]></title>
        <pubdate>2026-02-26T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Paul M. Masanja</author><author>Esther J. Tarimo</author><author>P. V. Kanaka Rao</author><author>Vijay Singh</author><author>Bernard Mwankemwa</author><author>Javier Junquera</author>
        <description><![CDATA[We present a comprehensive analysis of the electronic structure of the PF6− anion, a prototypical octahedral molecular system with high Oh symmetry. Using symmetry-adapted linear combinations of atomic orbitals and group theoretical techniques, we construct molecular orbitals and provide a systematic classification according to irreducible representations of the Oh point group. The role of the P-centered 3s, 3p, and 3d orbitals, together with the symmetry-adapted 2s and 2p orbitals of the six surrounding fluorine atoms, is explicitly analyzed. The electronic structure is described both within the theory of molecular orbitals and with the picture based on sp3d2 hybridization. Maximally localized Wannier functions derived from first-principles density functional theory calculations using the siesta and wannier90 codes are computed. The constructed Wannier functions accurately reflect the expected molecular symmetries and provide a natural minimal basis for tight-binding and second-principles modeling. A detailed comparison is made between bonding, nonbonding, and antibonding orbitals, as well as their energetic ordering. Our results demonstrate the interplay between symmetry, bonding, and electronic structure in molecular systems with high cubic symmetry and set the stage for the development of accurate minimal models for such systems.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1728372</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1728372</link>
        <title><![CDATA[Quantum tunneling and barrier hopping in MgTi2O5 nanoparticles: a study of AC/DC conductivity and dielectric response]]></title>
        <pubdate>2025-11-26T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>A. S. Salwa</author><author>H. S. Wasly</author><author>Alexandra Ioanid</author><author>M. S. Abd El-Sadek</author>
        <description><![CDATA[The electrical conductivity and dielectric characteristics were investigated across a frequency range of 200–5 MHz and a temperature range of 318 K to 433K for MgTi2O5 nanoparticles (NPs). The electrical conductivity data displayed two dominant conduction mechanisms: a quantum mechanical tunneling model (QMT) and the correlated barrier hopping model (CBH). The activation energy values derived from the Direct Current (DC) Conductivity were 0.15 and 0.27 eV. In addition, the activation energy values derived from the Alternating Current (AC) Conductivity decreased as frequency increased from 0.13 to 0.014 eV due to the improvement of electronic jumps among localized states. Additionally, dielectric investigation of MgTi2O5 NPs within the frequency range from (200 – 5 MHz) and the temperature range from (318K–433K) revealed that both real (ε1) and imaginary (ε2) components of a dielectric permittivity decrease as the frequency increased and increased as a temperature increased due to thermal motion of electrons, which is related to the polarization mechanism.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1643404</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1643404</link>
        <title><![CDATA[Correction: Editorial: Current research on spin glasses]]></title>
        <pubdate>2025-08-13T00:00:00Z</pubdate>
        <category>Correction</category>
        <author>Stefan Boettcher</author><author>Ralph Chamberlin</author><author>Gregory Kenning</author><author>Federico Ricci Tersenghi</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1599182</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1599182</link>
        <title><![CDATA[Machine learning discovery of the dielectric properties of strontium-containing condensed matter]]></title>
        <pubdate>2025-06-25T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Dongyang Huang</author><author>Jiaxing Fu</author><author>Chenghao Yu</author>
        <description><![CDATA[The dielectric constant is one of the most important physical properties of dielectrics. The pursuit of materials with high dielectric constants has long been a central focus in both fundamental research and practical applications. Traditional theoretical predictions or first-principles calculations of dielectric constants are often challenging and require significant time and computational resources. Machine learning techniques can establish models that link composition and properties, facilitating the study of dielectric properties in condensed matter and enhancing the efficiency of discovering new dielectrics. Strontium-containing dielectrics constitute a diverse class of materials, some of which exhibit exceptionally high dielectric constants, thereby showing great potential for practical applications. In this work, machine learning models were successfully developed to capture the relationship between composition and dielectric properties of strontium-containing dielectrics using different algorithms, with hyperparameter optimization performed via grid search. The optimal model achieved a correlation coefficient of 0.868 and demonstrated a certain degree of generalization ability on the test set. This model serves as a valuable reference and guide, improving the efficiency of dielectric material selection and the discovery of novel high-performance dielectrics.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1614764</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1614764</link>
        <title><![CDATA[The influence of defects on the interfacial thermal conductance of β12/χ3 borophene lateral heterostructures]]></title>
        <pubdate>2025-05-30T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Zhiping Li</author><author>Lang Chen</author><author>Dengfeng Li</author>
        <description><![CDATA[Interfacial thermal transport properties are critical for heat dissipation in micro/nanoelectronic devices. Borophene has structural polymorphism and the lateral heterostructures were often observed. The influence of defect on the interfacial thermal conductance (ITC) of β12/χ3 borophene heterostructures (BHs) was investigated through modified Lennard-Jones potential-based molecular dynamics simulations. The pristine interface exhibits high ITC of 6.57 GW K−1 m−2. The single-vacancy (SV) and doublevacancy (DV) defects at the interface reduced ITC to 3.14 GW K−1 m−2 and 1.57 GW K−1 m−2, respectively. The vibrational density of states (VDOS) overlap analysis shows the opposite trend with the change of ITC. Fortunately, spectral thermal flux and stress distribution can explain the reduction of the ITC for SV-BHs and DV-BHs. The von Mises stress of certain atoms at the interface for DV-BHs reaches up to 40 GPa. SV and DV defects lead to larger stress concentration and stronger phonon scattering near the interface. Defect engineering offers crucial insights into the potential of borophene heterostructures for thermal management.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1593391</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1593391</link>
        <title><![CDATA[Electro-optically tunable acoustic switch based on piezoelectric superlattices]]></title>
        <pubdate>2025-05-26T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Zhenghua Tang</author><author>Dajun Lei</author><author>Jianquan Huang</author><author>Yaqi Chen</author>
        <description><![CDATA[We propose a novel acoustic switch based on piezoelectric superlattices that is tunable by an external direct-current electric field. Our design harnesses the intrinsic coupling between acoustic waves and the oscillations of electric dipole moments within piezoelectric domains, which concurrently generate electromagnetic waves. The periodic modulation of the piezoelectric coefficient folds the phonon dispersion, leading to the intersection and hybridization with the electromagnetic dispersion branch and thereby opening a polaritonic band gap that governs acoustic wave propagation. Numerical simulations reveal that the absolute bandwidth of the first band gap near 10 GHz increases continuously from 0.003 GHz to 0.9 GHz as the electric field is raised from 0 V/m to 1.343 × 106 V/m. Compared with previous acoustic switches, which rely on phase transformations, nonlinear deformations, or radiation pressure, the proposed device operates at much higher frequencies, features continuous and reversible tunability via the electro-optic effect, and benefits from a compact design. Moreover, the observed consistency between the band gaps for acoustic and electromagnetic waves confirms the dual control capability of the switch. These features make the proposed acoustic switch promising for high-frequency acoustic modulation and integrated microwave filtering applications.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1569310</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1569310</link>
        <title><![CDATA[Temperature-dependent pure state for the thermodynamic system and its heat reservoir]]></title>
        <pubdate>2025-05-20T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Y. Q. Guo</author><author>J. X. Zhang</author><author>D. Mi</author><author>D. F. Wang</author>
        <description><![CDATA[Based on the quantum Liouville and Lindblad equations, a temperature-dependent pure state was constructed for the composite isolated system consisting of a thermodynamic system and its heat reservoir. The results demonstrate that the expectation value of this pure state coincides with the statistical average of the thermodynamic system’s mixed state. Furthermore, the existence of this pure state is consistent with the eigenstate thermalization hypothesis. Additionally, the “fictitious system” introduced in thermo field dynamics can be naturally interpreted as the heat reservoir of the system, and this interpretation allows us to re-examine the relationship between the physical system and the so-called “fictitious system.”]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1572883</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1572883</link>
        <title><![CDATA[Symmetries and topological phase transitions in modified Haldane models with long-range hoppings and gain-loss effects]]></title>
        <pubdate>2025-04-16T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Xiao-Cui Chen</author><author>Xiao-Feng Nie</author><author>Ye-Wei-Yi Li</author><author>Wen-Xue Cui</author>
        <description><![CDATA[We investigate a non-Hermitian modified Haldane model on a honeycomb lattice incorporating third nearest neighbor hopping t3. The results indicate that the system satisfies the pseudo-Hermitian and anti-PT symmetries, ensuring the reality and orthogonality of the eigenstates. We present the phase diagrams in the m/t2-ϕ and m/t2-t3 planes to elucidate the topological phases of the system. For specific values of t3, the system reveals Chern insulating phases characterized by Chern numbers ±2 and ±1, alongside trivial insulating phases. Upon introducing gain and loss γ in the on-site energy, additional phases with Chern number ±1 emerge between the two Chern insulating phases. The edge states possess topological properties and their number corresponds to the value of the Chern number by calculating and analyzing the edge states of a semi-infinite honeycomb lattice. Due to symmetry breaking caused by the truncation of the real-space lattice, the edge states acquire a significant amount of imaginary energy, while most of the bulk state energies remain almost real. Our work enhances understanding of the influence of long-range hoppings and gain-loss effects on the topological phases of non-Hermitian modified Haldane models.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1563982</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1563982</link>
        <title><![CDATA[Editorial: Current research on spin glasses]]></title>
        <pubdate>2025-03-11T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Stefan Boettcher</author><author>Ralph Chamberlin</author><author>Gregory Kenning</author><author>Federico Ricci Tersenghi</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1507250</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1507250</link>
        <title><![CDATA[Damage spreading and coupling in spin glasses and hard spheres]]></title>
        <pubdate>2025-02-13T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Koji Hukushima</author><author>Werner Krauth</author>
        <description><![CDATA[We study the connection between damage spreading, a phenomenon long discussed in the physics literature, and the coupling of Markov chains, a technique used to bound the mixing time. We discuss in parallel the Edwards–Anderson spin-glass model and the hard-disk system, focusing on how coupling provides bounds on the extension of the paramagnetic and liquid phases. We also work out the connection between path coupling and damage spreading. Numerically, the scaling analysis of the mean coupling time determines a critical point between fast and slow couplings. The exact relationship between fast coupling and disordered phases has not been established rigorously, but we suggest that it will ultimately enhance our understanding of phase behavior in disordered systems.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1524692</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1524692</link>
        <title><![CDATA[Resistance spikes of NiO/ZnO heterostructures in magnetic field]]></title>
        <pubdate>2025-01-17T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yu-Ze Sun</author><author>Li-Peng Qiu</author><author>Shi-Long Gao</author><author>Shi-Ze Cao</author><author>Shuai-Jie Wang</author><author>Wen-Peng Han</author><author>Jun Zhang</author><author>Yun-Ze Long</author>
        <description><![CDATA[NiO/ZnO semiconductor heterostructures were fabricated via electrospinning to investigate their resistance behavior under varying magnetic fields. The resistance of the heterostructures was measured at different temperatures and in magnetic fields of varying strength and direction. Resistance spikes of 1.3%, 5.2%, and 10.7% were observed at 300 K, 290 K, and 280 K, respectively. These resistance variations were found to be influenced by both the magnetic field magnitude and direction, as well as light illumination. The observed phenomena are attributed to the interaction between the heterojunction and the magnetic field, alongside changes in spin electron orientation. This study demonstrates the potential of combining heterostructures and magnetic fields to modulate resistance, offering promising applications for optoelectronic and magnetoelectronic devices.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1482907</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1482907</link>
        <title><![CDATA[Investigation of experimental signatures of spin glass transition temperature]]></title>
        <pubdate>2024-12-13T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Sahil Pradhan</author><author>David Harrison</author><author>Gregory Kenning</author><author>Deborah L. Schlagel</author><author>Samaresh Guchhait</author>
        <description><![CDATA[We present a series of temperature and field-dependent magnetization studies of large single-crystal spin glass samples, focusing on both field-cooled (FC) and zero-field-cooled (ZFC) magnetization studies, as well as ac susceptibility measurements. Using the above experimental techniques we aim to understand the nature of spin glass transition in presence of a field, a key factor in understanding the properties of these systems. Building on previous studies that have explored magnetic signatures indicative of spin glass transitions, our research employs a systematic approach to refine the identification of this transition temperature. Through static and dynamic measurements, we aim to shed light on the open issues regarding the key markers of spin glass transitions, enhancing our understanding of these complex systems.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1447018</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1447018</link>
        <title><![CDATA[A brief review of spin glass magnetometry techniques]]></title>
        <pubdate>2024-12-03T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Jennifer Freedberg</author><author>E. Dan Dahlberg</author>
        <description><![CDATA[Spin glasses are inherently dynamical. Taken properly, measurements of these materials can capture their dynamics and provide a wealth of insight into the physics of the spin glass state. In this methods review, two magnetometry methods are directly compared–ac and dc. Because these measurements are taken differently, the resulting data of each method will contain different information about spin glass behavior. This review will specifically focus on how the out-of-equilibrium effects of aging, rejuvenation, and memory manifest in each of these techniques, and how to construct protocols to measure these effects. We then describe the physical significance of each type of measurement and how to interpret their results. Finally, we explicitly detail which applications are most appropriate for which method. This will help the reader select the most helpful technique to carry out their own future experiments.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1473378</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1473378</link>
        <title><![CDATA[Critical droplets and replica symmetry breaking]]></title>
        <pubdate>2024-11-14T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>C. M. Newman</author><author>D. L. Stein</author>
        <description><![CDATA[We show that the notion of critical droplets is central to an understanding of the nature of ground states in the Edwards–Anderson–Ising model of a spin glass in arbitrary dimensions. Given a specific ground state, we suppose that the coupling value for a given edge is varied with all other couplings held fixed. Beyond some specific value of the coupling, a droplet will flip, leading to a new ground state; we refer to this as the critical droplet for that edge and ground state. We show that the distribution of sizes and energies over all edges for a specific ground state can be used to determine which of the leading scenarios for the spin glass phase is correct. In particular, the existence of low-energy interfaces between incongruent ground states, as predicted by replica symmetry breaking, is equivalent to the presence of critical droplets, whose boundaries comprise a positive fraction of edges in the infinite lattice.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1488275</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1488275</link>
        <title><![CDATA[Toward understanding the dimensional crossover of canonical spin-glass thin films]]></title>
        <pubdate>2024-11-05T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Qiang Zhai</author><author>Raymond L. Orbach</author>
        <description><![CDATA[Spin-glass thin films exhibit many features different from the bulk. The freezing temperatures of spin-glass films are suppressed for reduced thickness and follow the Kenning relation. The dynamics are altered near the vacuum interface. These phenomena are closely related to the lower critical dimension of spin glasses, the spin-glass correlation length, and the dimensional crossover from d = 3 to d = 2. In this article, we review the experimental facts and theoretical perspectives for spin-glass thin films. We focus on canonical spin-glass systems with the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction between magnetic impurities in a nonmagnetic host. Open questions to be addressed are emphasized.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1431810</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1431810</link>
        <title><![CDATA[Tensor networks for p-spin models ]]></title>
        <pubdate>2024-10-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Benjamin Lanthier</author><author>Jeremy Côté</author><author>Stefanos Kourtis</author>
        <description><![CDATA[We introduce a tensor network algorithm for the solution of p-spin models. We show that bond compression through rank-revealing decompositions performed during the tensor network contraction resolves logical redundancies in the system exactly and is thus lossless, yet leads to qualitative changes in runtime scaling in different regimes of the model. First, we find that bond compression emulates the so-called leaf-removal algorithm, solving the problem efficiently in the “easy” phase. Past a dynamical phase transition, we observe superpolynomial runtimes, reflecting the appearance of a core component. We then develop a graphical method to study the scaling of contraction for a minimal ensemble of core-only instances. We find subexponential scaling, improving on the exponential scaling that occurs without compression. Our results suggest that our tensor network algorithm subsumes the classical leaf removal algorithm and simplifies redundancies in the p-spin model through lossless compression, all without explicit knowledge of the problem’s structure.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1431805</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1431805</link>
        <title><![CDATA[Electronic 1/f noise as a probe of dimensional effects on spin-glass dynamics]]></title>
        <pubdate>2024-10-18T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>David C. Harrison</author>
        <description><![CDATA[Over the past decade, spin-glass simulations have improved to the point that they now access time- and length-scales comparable to experiments at the mesoscale. A recent series of thin-film field-cooled/zero-field-cooled magnetization (FC/ZFC) experiments demonstrated activated spin dynamics, with a temperature-independent activation energy proportional to the logarithm of the film thickness and with coefficients in remarkable agreement with the simulation. These measurements require the application of small magnetic fields, which has been shown to affect the spin-glass energy landscape. Measurements of the 1/f noise in metallic spin-glasses have been previously shown to be a sensitive probe of the spin dynamics, and the measurements can be made without applying a magnetic field. In this mini-review, we review these techniques and discuss how transport measurements can fit into the current landscape of spin-glass measurements. We compare previous measurements to more recent measurements on similar films, made with ostensibly different cooling protocols, and compare both the previous and recent measurements to the magnetometry. The transport measurements—taken over a wider range of temperature than magnetometry—suggest that the maximum spin-glass energy barrier height is temperature-dependent, not fixed, possibly due to two-dimensional dynamics. We discuss this possibility, along with future measurements, which may be able to resolve this mystery.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1466987</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1466987</link>
        <title><![CDATA[Physics of the Edwards–Anderson spin glass in dimensions d = 3, … ,8 from heuristic ground state optimization]]></title>
        <pubdate>2024-09-20T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Stefan Boettcher</author>
        <description><![CDATA[We present a collection of simulations of the Edwards–Anderson lattice spin glass at T=0 to elucidate the nature of low-energy excitations over a range of dimensions that reach from physically realizable systems to the mean-field limit. Using heuristic methods, we sample the ground states of instances to determine their energies while eliciting excitations through manipulating boundary conditions. We exploit the universality of the phase diagram of bond-diluted lattices to make such a study in higher dimensions computationally feasible. As a result, we obtain a variety of accurate exponents for domain wall stiffness and finite-size corrections, which allow us to examine their dimensional behavior and their connection with predictions from mean-field theory. We also provide an experimentally testable prediction for the thermal-to-percolative crossover exponent in dilute lattice Ising spin glasses.]]></description>
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