Ferroelastic domain walls (DWs) offer a unique platform for engineering dynamic magnetism through controlled symmetry breaking. Here, we demonstrate deterministic magnetic field generation in reconfigurable DW networks using nanocavity-patterned ferroelastic matrices. Atomistic simulations reveal that propagating kinks along polar twin walls induce strain-gradient polarization and displacement current vortices, producing localized magnetic fields $(\sim {10}^{-7}\text{–}{10}^{-6} \mathrm{T})$ via flexoelectric coupling. These fields exhibit scale-free avalanche dynamics with universal power-law exponents, mirroring mechanical energy release events during kink nucleation and depinning transitions. To overcome intrinsic disorder limitations, we mimic lithographically defined nanocavities that guide orthogonal DW propagation with cycle-to-cycle reproducibility, achieving local field enhancement compared to stochastic networks. Scanning superconducting quantum interference device (SQUID) microscopy on ${\mathrm{SrTiO}}_3$ detects out-of-plane magnetic signatures $(\sim {10}^{-7} \mathrm{T})$ persisting for milliseconds, quantitatively matching simulations and indicating extended lifetimes. Crucially, kink velocity-dependent dynamic magnetism is established through synchronized magnetic and energy jerk profiles, resolving the atomic-scale mechanism linking DW motion to emergent magnetism. This work establishes a multiscale framework for defect-engineered ferroelastic materials, bridging atomic-scale polarization dynamics, mesoscale DW circuit design, and macroscale nonvolatile memory functionality. By decoupling magnetic responses from intrinsic disorder, our approach advances ferroelastic DW networks toward practical applications in strain-programmable spintronics and ultrahigh-density racetrack memories.

We unveil the mechanism of the puzzling boundary-localized bound states formation in a spinless fermionic open lattice with nearest-neighbor interactions. By solving the Bethe-ansatz equation analytically, we uncover asymmetrical string solutions corresponding to the boundary-localized bound states, which emerge in systems with at least three particles. The localized bound states (LBSs) can become bound states in continuum with a suitably chosen parameter. When the number of particles increases to five or more, additional LBSs away from the boundary are also observed. Through rigorous analysis, we derive recurrence relations of the quasimomentum of the localized states as a function of the number of particles, predicting the presence of a hierarchy of many-body LBSs in interacting open lattices.

In addition to describing our universe, gravitational theories profoundly inspire the study of emergent properties of exotic phases of matter. While the anti-de Sitter/conformal field theory (AdS/CFT) correspondence is one of the most celebrated examples, the field of fractonic matter—driven in part by gapless phases resembling linearized gravity—has also seen rapid developments. Despite the deep implications of both areas, connections between them remain sparse, primarily due to the difficulty in constructing explicit models that encapsulate both fields' essential features. Here we demonstrate the efficacy of the recently proposed hyperbolic fracton model as a concrete model for AdS/CFT duality. Using explicit numerical and analytical calculations on the discrete hyperbolic lattice, we show that the boundary state exhibits conformal field theory properties. Our main result is that bulk defects induce an emergent temperature for the boundary state, proportional to the defect perimeter, in quantitative agreement with the expected behavior of a black hole in AdS spacetime. The hyperbolic fracton model thus emerges as a unique lattice model of holographic principle equipped with a well-defined bulk Hamiltonian and offers a promising gateway for studying a wide range of holographic phenomena.

It has been understood in the past decade or two that the dynamics of spin or magnetization in an ultrafast regime necessarily involves an inertial term that reflects the reluctance to follow abrupt or sudden changes in the spin or magnetization orientation. The role of inertial spin dynamics in governing the motion of the skyrmion, a topological spin texture, is elucidated. Using the nonequilibrium Green's function Keldysh formalism, an equation of motion is derived in terms of collective coordinates for a skyrmion coupled via a “minimal coupling” to a bath of harmonic oscillators of frequency $\omega$, modeling an optical phonon-like bosonic bath with its nearly flat energy spectrum, and a coupling to the phonon energy density that dominates under the resonance condition at the optical phonon frequency. A deterministic and nondissipative dynamics equation of motion is obtained with an explicit mass term for the skyrmion emerging due to the coupling, even within the rigid skyrmion picture. This results in a cyclotronic motion of the skyrmion, with a frequency that can go ultrafast, depending on that of the oscillator. Controlling the oscillator frequency can therefore guide the skyrmion dynamics. Our theory bridges inertial dynamics and topology in magnetism and opens a pathway to ultrafast control of topological spin textures.

We investigate magnetic-field-induced transitions in the dynamical spin correlation functions of the Kitaev spin liquid (KSL). Using time-dependent Majorana mean-field theory, we show that in the ferromagnetic KSL, the real-space propagation of spin correlations evolves from isotropic to highly anisotropic with increasing field strength. Notably, the anisotropy emerges as a unidirectional propagation of spin correlations, whose direction is dictated by the orientation of the magnetic field relative to the underlying Kitaev bond geometry. We analyze this phase transition through both a Majorana mean-field framework and perturbative approach, and propose some experimental signatures and possible detection schemes. We further demonstrate that a similar transition occurs in the antiferromagnetic KSL, and discuss why previous studies focusing on the [111] field direction have overlooked this phenomenon, which further suggests the possibility to identify such anisotropic dynamics in candidate Kitaev materials.

We present a study of the Berezinskii-Kosterlitz-Thouless (BKT) transition in mildly disordered NbN nanoporous (NP) films. The measured superfluid stiffness, $J_s$, is found to be much lower than that predicted considering a reduced geometric area. For a 5 nm thick NP film, a distinct BKT transition is observed. By fitting the experimental data via the BKT renormalization-group equations, we show how both $J_s$ and the vortex-core energy, $\mu$, decrease in the presence of nanopores. The variation of $J_s$ and $\mu$ is also reproduced theoretically via Monte Carlo numerical simulations on a 2D diluted XY model. Our results show that nanopore geometries effectively enhance the 2D nature of the superconducting films, increasing the parameter space to explore the BKT physics while offering a pathway to systematically control the two energy scales, $J_s$ and $\mu$, that govern the vortex physics in these systems.

We investigate the momentum-resolved dynamics of conduction electrons in noble metals following ultrashort optical excitation with linearly polarized light. Using a momentum-resolved Boltzmann equation approach for electron-phonon interaction, we solve for the combined effects of orientational relaxation, thermalization, and cooling. We introduce momentum orientational relaxation as the initial step in the equilibration of an optically excited nonequilibrium electron gas by highlighting its importance for the optical response of noble metals as the dephasing of the Drude model. The numerical results for gold reveal that orientational relaxation exists already for linear optical excitations and dominates on time scales on the first tens of femtoseconds after excitation. Also incorporating thermalization and cooling on times up to a few picoseconds, our approach provides a simultaneous description of optical and thermal properties of noble metals under optically induced nonequilibrium conditions.

We propose using Andreev bound states (ABS) as spectroscopic probes to characterize Majorana zero modes (MZMs) in quantum dot-based minimal Kitaev chains. Specifically, we show that tunneling conductance measurements with a superconducting probe hosting an ABS reveal four subgap peaks whose voltage positions and relative heights enable extraction of the MZM energy splitting and Bogoliubov-de Gennes coherence factors. This provides direct access to zero-splitting regimes and to the local Majorana polarization—a measure of the Majorana character. The method is compatible with existing experimental architectures and remains robust in extended chains.

Kenning et al. discovered the collapse of the effective response time, $t_H^{\text{eff}}(t_{\text{w}};T)$, independent of aging time, $t_{\text{w}}$, as one approached the spin glass transition temperature $T_{\text{g}}$ from below. Nordblad and Lundgren observed the same effect by reducing the temperature from $T_{\text{g}}\left(H\right)$. We analyze the behavior of $\ln t_H^{\text{eff}}(t_{\text{w}};T)$ in the temperature range near and below $T_{\text{g}}$ using a scaling law that takes into account both the magnetic field $H$ and the time-dependent spin-glass coherence length $\xi (t,t_{\text{w}};T)$. An overdetermined predictive fit to the experimental data accounts for a quasioscillatory structure of $\ln t_H^{\text{eff}}(t_{\text{w}};T)$ as a function of magnetic field $H^2$ for reduced temperatures as large as $T/T_{\text{g}}=0.98$.

Spin wave and magnetic domain wall are two of basic excitations in magnetic systems, and their spatiotemporal interplay encodes rich information of underlying magnetic interactions. In synthetic antiferromagnets, the domain wall acquires an inertia and the spin wave unlocks the full polarization degree of freedom, lays a salient platform for their interplay. Here we show that both the translational and angular velocities of the domain wall in synthetic antiferromagnets can be detected via the scattered spin wave, through the synergy of translational and angular Doppler effects. Following the setup of an electromagnetic or acoustic radar, the time evolution of a domain wall state is accessible via a series of spin wave packets, in both noninvasive and invasive fashion. The inspections in the frequency domain, offer new paradigms in the exploration and exploitation of magnetic excitations.

Longitudinal magnons are a distinct type of multipolar excitations in magnetic materials with large spins $S\ge 1$ and strong easy-axis anisotropy. These excitations have angular momentum $S^z=\pm 2S$ and can be viewed as a propagating full spin reversal. We study longitudinal magnons for the nearest-neighbor Heisenberg ferromagnet and antiferromagnet on a square lattice with large single-ion anisotropy. In the strong-coupling limit, we derive an effective spin-1/2 model including two leading contributions in $J/D$. The effective model provides a simple description of the longitudinal magnon dynamics. For $S=1$, we compare results from several theoretical approaches that include the effective spin-1/2 model, the linked-cluster expansion, the multiboson spin-wave theory, and, for a ferromagnet, an exact two-particle solution. Among these approaches, the multiboson spin-wave theory provides the decay rate of longitudinal magnons and describes evolution of the excitation spectra from strong to weak anisotropy.

High-quality single crystals of the half-Heusler compound DyNiSb were investigated for their low-temperature thermodynamic and magnetotransport properties. Magnetic susceptibility, heat capacity, and electrical resistivity measurements revealed two distinct magnetic phase transitions at $T_{\mathrm{N}1}$ = 7.3 K and $T_{\mathrm{N}2}$ = 3.4 K, contrasting with previous reports on polycrystalline samples, which identified only a single transition near $T_{\mathrm{N}2}$. Moreover, the studied samples were found to exhibit Metal like conductivity, at odds with a semiconducting behavior reported for the polycrystals. Magnetoresistance measurements performed in both transverse and longitudinal configurations revealed in small magnetic fields a weak antilocalization effect that diminishes with increasing temperature, giving way to a positive, monotonic magnetoresistance at high temperatures. Angular-dependent resistivity studies showed a crossover from fourfold to twofold symmetry with increasing magnetic-field strength, suggesting a field-induced reconstruction of the Fermi surface. Our findings highlight a complex magnetic and electrical transport behavior in DyNiSb, highly sensitive to structural disorder and easily tunable by external magnetic field.

This study presents a new nonsymmorphic symmetry-protected topological phase, as well as a two-dimensional (2D) surface topological superconductivity on ${\mathrm{PtPb}}_4$ surface. The bulk superconductivity of ${\mathrm{PtPb}}_4$ exhibited characteristic of a conventional moderately-coupled Bardeen–Cooper–Schrieffer nonideal type-II superconductor. Nevertheless, the superconductivity investigated via electrical transport exhibited anisotropic properties of 2D nature, verified through a Berezinsky-Kosterlitz-Thouless transition and 2D-like vortex dynamics in mixed-state transports. The obtained activation energy U(H), critical current density $J_{\mathrm{c}}(T,H)$, and scaling of pinning forces for $F_{\mathrm{p}}\left(H\right)$ for ${\mathrm{PtPb}}_4$ showed a relatively weak vortex pinning in ${\mathrm{PtPb}}_4$, accompanied by a crossover of the flux-line lattice from elastic relaxation to shear deformation. In the normal state, ${\mathrm{PtPb}}_4$ revealed nontrivial quantum interference transports with a crossover from weak-antilocalization- to weak-localization-dominated transverse magnetoresistance (TMR) in the low-field region, demonstrating the presence of topological surface states on ${\mathrm{PtPb}}_4$. Besides, the violation of Kohler's rule with a power-law exponent value of 1.4 also revealed a nontrivial MR characteristic of ${\mathrm{PtPb}}_4$. The pronounced exotic TMR characteristic confirmed that ${\mathrm{PtPb}}_4$ indeed hosts topological surface states, driven by a new nonsymmorphic symmetry-protected topological phase. All results are summarized in a constructed phase diagram of ${\mathrm{PtPb}}_4$ in the H-T plane, displaying different regimes of transport. The observed 2D superconductivity, as well as nontrivial quantum-interference transports, can be attributed to the dispersion of topological Dirac-like surface band in ${\mathrm{PtPb}}_4$. Our findings provide robust support for the emergence of a new nonsymmorphic symmetry-protected topological phase on the ${\mathrm{PtPb}}_4$ surface. Thus, ${\mathrm{PtPb}}_4$ is one of the few reported nonsymmorphic symmetry-protected topological superconductors, paving the way for the development of superconducting quantum computation.

We report a detailed investigation of the Fermi surface in the layered Dirac semimetal ${\mathrm{TaNiTe}}_5$. We probed the magnetization, magnetic torque, and magnetoresistance in high-quality single crystals. Pronounced Shubnikov–de Haas and de Haas–van Alphen oscillations are observed in magnetic fields above $3\mathrm{T}$ and at temperatures of up to $22\mathrm{K}$. Multiple fundamental frequencies and light effective quasiparticle masses are obtained by fast Fourier transformation (FFT) and Lifshitz-Kosevich formula fits. The high resolution of the low-temperature FFT spectra allows us to investigate individual peaks in detail for the magnetic fields applied along all three crystallographic axes and the planes in between. Our investigation can confirm the density functional theory calculated band structure and its corresponding Fermi surface.

Quantum computation departs from the classical paradigm of deterministic, bit-based processing by exploiting inherently quantum phenomena such as superposition and entanglement. We propose a framework for qubit realization based on skyrmionic states stabilized by the Dzyaloshinskii-Moriya interaction (DMI) in two-dimensional spin lattices. The model incorporates competing exchange interactions, perpendicular magnetic anisotropy, and Zeeman coupling, solved via exact diagonalization under periodic (PBC) and open boundary conditions (OBC). A quantum skyrmionic phase emerges for PBC within a parameter space defined by DMI, exchange, field, and anisotropy, while OBC favor classical-like, topologically protected skyrmions. Quantum logic gates (Pauli $X, Y, Z$, Hadamard) are implemented on both skyrmion types. Energy density and entanglement entropy analyses reveal that quantum skyrmions suffer from DMI-driven decoherence and reduced gate fidelity, whereas classical-like skyrmions maintain stability. Exact simulations of qubit dynamics, including drive effects and Lindblad decoherence, demonstrate tunable anharmonic energy levels and coherent Bloch-sphere manipulation, making these skyrmionic states promising candidates for qubit implementation. Overall, the Dzyaloshinskii-Moriya interaction plays a dual role, stabilizing skyrmionic qubits while simultaneously inducing decoherence during gate operations.

The present paper is devoted to comprehensive theoretical studies of exciton-polariton quantum fluid specificities in the optics of their utilization for quantum turbulence research. We show that a nontrivial implementation of time-varying potential for excitation of quantum fluid (injection of quantized vortices) via the stirring procedure can be efficiently substituted with resonant excitation-based phase-imprinting techniques. The most efficient phase pattern corresponds to imprinting of tiles with randomly oriented plane waves in each. The resulting turbulent flows, spatial vortex distributions, and clustering statistics resemble those for the case of a conventional spoon-stirring scheme. We quantify the limitations on the lifetime and density depletion for the development and sustainability of quantum turbulence. The yield is the necessity to prevent the density depletion for more than one order of magnitude. Finally, we demonstrate that turbulence is robust with respect to alternating gain and loss at a certain range of modulation parameters, which corresponds to laser operating above and below condensation threshold.