We develop a coarse-grained theoretical description of the macroscopic emergent electric field generated by phonon-coupled lattice deformations in the breathing and rotational dynamics of a skyrmion lattice under microwave excitation. The analysis identifies the symmetry and dynamical conditions that yield rectified (dc) and oscillating (ac) electric fields, even in the absence of net translational motion of the skyrmion lattice, particularly in the dilute-lattice limit. Using experimentally measurable skyrmion profile parameters such as the equilibrium radius, domain-wall width, and dynamical resonance frequency of the skyrmion lattice, the model further enables identification of harmonic components contributing to the observed macroscopic electrodynamic response in the long-wavelength phonon limit ($q\to 0$) and at finite phonon frequency, providing a unified framework for phonon-driven spin-charge-lattice coupling in topological magnets.

Odd-parity magnetism has attracted significant interest for its unconventional spin splitting. However, a concrete microscopic route for its realization remains elusive. In this work, we propose van der Waals heterostructures of stripe antiferromagnets (sAFMs) as an ideal platform for electrically controllable $p$-wave magnetism. In the sAFM/metal/sAFM structure, the leading Ruderman-Kittel-Kasuya-Yosida–type exchange interaction is canceled due to the symmetry of the stacking pattern. This exposes a higher-order biquadratic interaction as a dominant contribution that drives a filling-controlled transition from a collinear phase to an orthogonal $p$-wave configuration. The resulting $p$-wave phase exhibits a gate-tunable Edelstein response, which originates from magnetic symmetry breaking rather than conventional relativistic spin-momentum locking and remains robust even under substantial spin-orbit coupling. Finally, we propose material candidates for the realization of our theory. Our results establish van der Waals heterostructures as a practical platform for nonrelativistic spintronics with electric control of $p$-wave spin textures.

The PXP chain was recently shown to exhibit superdiffusive energy transport with Kardar-Parisi-Zhang-like scaling, $z\approx 3/2$, joining a growing number of spin chains with this exponent. An understanding of how this anomalous hydrodynamics emerges from microscopics is, however, still lacking. In this work, we show that finite-temperature energy transport in this model provides a window into the emergence of superdiffusion. At finite temperature, the energy autocorrelation function exhibits a crossover from short-time coherent dynamics to long-time hydrodynamics. The short-time behavior is dominated by a single magnon band and can be understood analytically. In momentum space, this regime is characterized by spectral weight near $q=\pi$. The damping time $\tau$, which separates the short-time magnon-dominated behavior from the late-time hydrodynamics, grows rapidly upon cooling, consistent with an activated form $\tau \left(\beta \right)\sim \beta e^{\mathrm{\Delta }\beta }$ with a gap scale set by the magnon band. At longer times, the spectral weight transfers to $q=0$ and the running decay exponent drifts toward the superdiffusive value $z=3/2$. Finite-temperature energy transport therefore provides a bridge between microscopic magnon physics and late-time superdiffusion in the PXP model.

As the third fundamental class of collinear magnets, altermagnets have recently attracted significant interest for their potential spintronic applications. However, realizing two-dimensional (2D) altermagnets with pure spin current remains a critical challenge. In this work, taking the experimentally established $d$-wave altermagnet semiconductor α-MnTe as an example, we demonstrate that the (110)-oriented MnTe ultrathin film (${\mathrm{Mn}}_{10}{\mathrm{Te}}_{10}$) with a thickness of two unit cells is the thinnest 2D altermagnet derived from bulk MnTe along the (110) orientation, as confirmed by magnetic symmetry analysis and first-principles calculations. The resulting 2D ${\mathrm{Mn}}_{10}{\mathrm{Te}}_{10}$ ultrathin film exhibits robust dynamical stability, a low exfoliation energy of $51.3\mathrm{MeV}/{\AA }^2$, a high Néel temperature of 454 K, a large spin splitting of 492 meV, a band gap of 1.079 eV, and anomalous Hall conductivity of 95 S/cm. We further propose lattice-matched CdTe (001) as a suitable substrate for ${\mathrm{Mn}}_{10}{\mathrm{Te}}_{10}$ growth and demonstrate that interfacial strain combined with charge transfer can drive a transition from an altermagnetic semiconductor to a fully compensated ferrimagnetic half metal, thereby enabling highly spin-polarized current generation. Finally, we constructed a ${\mathrm{Mn}}_{10}{\mathrm{Te}}_{10}$/CdTe (001) magnetic tunnel junction (MTJ) and investigate its spin-resolved transport properties. At equilibrium (zero temperature, zero bias), the spin-up conductance is 44.82 µS, while the spin-down conductance is 0.23 µS, corresponding to nearly 100% spin polarization and typical half-metallic MTJ behavior. These findings highlight a viable strategy for designing 2D altermagnets in related material systems and substrate engineering as a promising strategy for developing low-power spintronic devices based on 2D altermagnets.

We propose encapsulating type-A antiferromagnetic semiconductors between graphene layers to realize a gate-tunable synthetic antiferromagnet with nonrelativistic spin splitting, enabling efficient spintronic transport via graphene. Density functional theory calculations and tight-binding models of a graphene/MnS/graphene heterostructure reveal that gate tuning of the heterostructure breaks the top/bottom graphene equivalence, inducing opposite ferromagnetic proximity exchange that lifts spin degeneracy to yield nonrelativistic spin splitting at the Fermi level, dominating over relativistic effects. The induced effects manifest as conductance dips in spin-resolved transport through proximitized graphene nanoribbons, observable as giant magnetoresistance within a narrow energy window around the Fermi level. Our graphene/type-A antiferromagnetic heterostructure, a readily synthesizable platform incorporating antiferromagnets with nonrelativistic spin splitting, paves the way for gate-manipulated, low-dimensional antiferromagnetic devices.

The generation of spin currents and their use in controlling magnetic states are central to spintronics. In particular, out-of-plane spin polarization is highly desirable for ultrahigh density, low-power magnetic memory because it enables field-free switching of perpendicular magnetization. This can be achieved through low-symmetry crystals and symmetry-broken interfaces, which generate out-of-plane spin currents, enabling deterministic field-free switching. In this work, we investigate the spin-orbit torque (SOT) in high-quality epitaxial ${\mathrm{MnPd}}_3$ films grown on MgO substrates, with a particular emphasis on the role of crystal symmetry in generating unconventional spin polarizations. Our measurements reveal a conventional SOT arising from the $y$-polarized spin current, along with unconventional SOT originating from the $x$- and $z$-polarized spin currents. By injecting charge currents along different crystal orientations, we further reveal a strong correlation between the unconventional torques and crystal orientation. Notably, the damping-like torque generated by the out-of-plane polarized spin current is found to comprise two distinct contributions: a bulk contribution and an interfacial one. Even after the insertion of a Cu spacer layer, this significant damping-like torque efficiency persists. This work provides valuable insights for designing and optimizing spintronic devices with enhanced performance.

We investigate magnetization dynamics in time-varying ferrimagnetic (or ferromagnetic) media (TVFMs) arising from temporal modulation of the bias magnetic field. Within the Landau-Lifshitz-Gilbert framework, we derive the full time-domain magnetic susceptibility without invoking the commonly used instantaneous-response or adiabatic approximations. The resulting susceptibility inherently includes memory and dispersion effects. The theory is further developed for sinusoidally modulated bias, showing how the magnetization harmonics follow Bessel-function weighting, thus enabling precise spectral shaping. We demonstrate that hundreds of harmonics can be generated with controlled energy concentration in selected orders. The propagation characteristics and band structure of Bloch waves in a bulk TVFM (with longitudinal modulation) are found, revealing a modulation-induced momentum band gap. We finally demonstrate scattering from a TVFM slab and show that the spectrum of the scattered field directly mirrors the harmonic spectrum predicted by the magnetization dynamics, with exact harmonic-amplitude correspondence in thin slabs.

The onset of decoherence in open many-body systems lacks a dynamical timescale grounded in the loss of bipartite entanglement. Here, we introduce the geometric decoherence time, defined as the earliest moment the monotone relation between logarithmic negativity and Rényi-$\frac{1}{2}$ entropy—exactly equal across any bipartition for pure states—breaks down under open-system evolution, signaling entropy growth without accompanying entanglement growth. We establish this criterion in both single-particle Gaussian dynamics and many-body Lindbladian evolution. We show that quantum mutual information provides a complementary long-time diagnostic: Its asymptotic vanishing is equivalent to factorization of the steady state across the bipartition, a condition strictly stronger than separability, and whenever a product steady state is approached exponentially in trace norm, negativity and mutual information share the same decay rate. In the presence of a strong symmetry, this tracking can fail—residual classical correlations can survive after entanglement has vanished. In the Kitaev chain with balanced gain and loss, we derive a closed-form solution and show that the topological phase sustains longer coherence times than the trivial phase at identical dissipation, with a local minimum at the chiral-symmetric point. In the interacting XXZ chain, exact many-body evolution shows that local $Z$ dephasing preserves residual classical correlations, whereas gain and loss restore the mutual-information tracking of negativity. Our results establish the geometric decoherence time as a dynamical scale tracking the onset of decoherence.

Recent years have witnessed significant progress in the entanglement-based characterization of quantum phases of matter. The primary objects of interest are the reduced density matrix and its associated entanglement Hamiltonian. As intrinsic properties of a quantum state, these quantities theoretically determine all experimentally accessible local observables. In this work, we investigate the response of two entanglement measures to the real-time dynamics driven by the entanglement Hamiltonian, a process known as modular flow. We demonstrate that our results can be unified into a single generating function, $\langle {\rho }_{AB}^{\alpha }{\mathrm{e}}^{\lambda Q_{AB}}{\mathrm{e}}^{\mu Q_{BC}}{\rho }_{BC}^{\beta }\rangle$. This function is of independent interest because it represents a generalization of the recently proposed Rényi modular commutator. In appropriate limits, this function yields the response of Rényi entropy and its charged version, which we find to be uniquely determined by chiral topological invariants, specifically the chiral central charge and the Hall conductance. Our analytical findings are validated through two independent approaches: (1) free fermion systems using the real-space Chern number formula and (2) an effective field theory treatment that regularizes the entanglement cut via chiral conformal field theory. Both methods yield consistent results.

Achieving purely electrical manipulation of valley degrees of freedom, independent of magnetic fields, represents a critical milestone for next-generation nonvolatile electronics. Using first-principles calculations, we establish bilayer ${\mathrm{CuCrP}}_2{\mathrm{S}}_6$ as a robust platform for such control, driven by the interplay between ferroelectricity and antiferromagnetism. In the ferroelectric state, broken inversion symmetry and spin-orbit coupling induce a single-spin valley-polarized state with a 20.34 meV splitting, enabling an anomalous valley Hall effect where carrier spin is locked to polarization. Conversely, the antiferroelectric state restores effective parity-time symmetry, suppressing macroscopic splitting. However, we uncover a nontrivial hidden Berry curvature in this regime that generates a layer Hall effect characterized by layer-contrasting spin currents. Our findings demonstrate that electrically toggling between ferroelectric and antiferroelectric orders reversibly switches the system between a spin-polarized valley transport regime and layer-selective transport, facilitating valleytronic logic operations without external magnetic fields.

A central challenge in non-Hermitian sensing is that spectral singularities simultaneously amplify both the signal and environmental noise. We address this predicament in a double-chain Hatano-Nelson model featuring unidirectional interlayer coupling. At the exceptional-deficiency (ED) limit, the system exhibits a macroscopically degenerate complex spectrum and a pronounced non-Hermitian skin effect (NHSE), yielding a sensitivity that scales exponentially with lattice size $N$ while remaining robust across a six-order-of-magnitude detuning range. By introducing diagonal spatial disorder, we demonstrate that the NHSE is progressively suppressed, whith eigenspace cosine similarity analysis quantifying a well-defined fault-tolerance threshold. To reconcile the sensitivity-noise trade-off, we delineate at-ED and off-ED operating regimes. While the at-ED configuration imposes fractional-order noise amplification [signal-to-noise ratio (SNR) $\propto {\delta }^{-1/2}$] that saturates at a suboptimal plateau, migrating to the off-ED regime eliminates this geometric singularity and restores a linear scaling law (SNR $\propto {\delta }^{-1}$), achieving an SNR enhancement of several orders of magnitude. Crucially, this improvement is achieved while fully preserving the exponential sensitivity scaling, albeit at a slightly reduced absolute sensitivity compared with the strict at-ED limit. Our findings establish the off-ED framework as a concrete paradigm for next-generation topological sensors that reconcile extreme sensitivity with robust noise immunity.

Using the Kohn-Sham (KS) inversion method of Hollins et al. [J. Phys.: Condens. Matter 29, 04LT01 (2017)], we invert densities from variational and diffusion quantum Monte Carlo (QMC) calculations to obtain benchmark QMC-KS potentials for a range of insulators and semiconductors, which we then compare to the KS potentials of popular density functional approximations (DFAs). Our results show that different DFAs yield similar electron densities, despite differences in their KS potentials, which originate primarily from the exchange and correlation contribution. We also find that the KS gap from the QMC density is typically larger than the KS gaps of most DFAs, with the exception of Hartree-Fock. Finally, the KS gap is sensitive to the inclusion of semicore states in the pseudopotentials, such that comparison with experiment should be done with caution.

Yttrium iron garnet (${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$) is a prototypical ferrimagnetic insulator widely used in spin-wave and magnonic devices owing to its extremely low magnetic damping and long magnon propagation length, and recent experiments suggest that lattice vibrations can influence magnetic properties, motivating a microscopic understanding of how phonons modify exchange interactions. In this work, phonon-driven tuning of exchange interactions in ${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ is investigated from a mode-resolved perspective based on first-principles calculations. We focus on how optical phonons modify the dominant superexchange pathways and how lattice distortions affect the Fe-O-Fe bond geometry that governs the exchange interaction. To this end, phonon modes are computed from density functional theory, and the exchange interactions are evaluated from a Wannier-based tight-binding model and mapped onto a spin Hamiltonian, while displaced structures along individual infrared-active modes are used to quantify their impact on the magnetic interactions.

We investigate thermal Hall transport in magnetic systems, using semiclassical spin dynamics simulations. Building on a linear response framework, we discuss the intricacies of computing the thermal Hall conductivity from real-time energy current correlations and the energy magnetization. We then apply this methodology to two models: a square-lattice chiral magnet with in-plane Dzyaloshinskii-Moriya interaction, and the antiferromagnetic Kitaev model in a field. Our results demonstrate the efficiency of semiclassical spin dynamics to study thermal Hall transport capturing quantitative effects beyond the simple intrinsic noninteracting approximation. They can serve as a benchmark for comparison with experiments in regimes where nonlinearities from magnon-magnon interactions and strong thermal fluctuations play a crucial role.

We calculate the theoretical nondegenerate two-photon absorption and three-color injected current response tensors for bulk GaAs and ${\mathrm{Ge}}_{1-x}{\mathrm{Sn}}_x$ for a range of alloy compositions. In particular, by including a “pump” beam we compare two “schemes” that are sensitive to midinfrared photons. In scheme I we consider GaAs and a pump photon with energy greater than half the band gap, and in scheme II we consider ${\mathrm{Ge}}_{1-x}{\mathrm{Sn}}_x$ with a pump photon with energy less than half the band gap. We find that for certain pump and alloy concentrations ${\mathrm{Ge}}_{1-x}{\mathrm{Sn}}_x$ has a substantially larger nonlinear response and three-color injected current than GaAs in the midinfrared frequency window where both materials can absorb photons via nondegenerate two-photon absorption.

Analytical treatments of tunneling in bilayer graphene have typically relied on minimal models including only the vertical interlayer hopping ${\gamma }_1$ and have been restricted to the weak interlayer-bias regime ($2\varepsilon \ll {\gamma }_1$). Consequently, they cannot adequately describe lattice deformations or strong electric-field effects. In this work, we present an analytical theory of evanescent states in electrically gapped bilayer graphene that overcomes both limitations. Our approach explicitly incorporates the skew interlayer hoppings ${\gamma }_3$ and ${\gamma }_4$ and remains valid even when the interlayer bias $2\varepsilon$ is comparable to ${\gamma }_1$. Focusing on low-energy electronic states near the charge neutrality point, we analytically derive the complex longitudinal wave numbers, the gap width, and the sublattice pseudospin within the electric-field-induced gap. We then systematically analyze the dependence of these quantities on the interlayer shear displacement $\vec{\delta }=({\delta }_x,{\delta }_y)$, and find that skew interlayer hoppings, in particular ${\gamma }_3$, play an essential role. For transport along the zigzag ($x$) direction, the longitudinal wave vector becomes complex, whereas the transverse wave vector remains real. For a monolayer/bilayer/monolayer junction with transport along the zigzag direction, we find that ${\delta }_y$ has a significantly stronger impact on the conductance than ${\delta }_x$. Furthermore, we identify a shear-induced phase proportional to ${\delta }_y$ that appears universally in the analytical expressions for the gap width, the sublattice pseudospin, and the decay length. These results establish a unified framework for shear- and bias-controlled evanescent tunneling in bilayer graphene and suggest broader relevance to nonequilibrium transport phenomena in layered materials.

Moiré superlattices host a rich variety of correlated topological states, including interaction-driven integers and fractional Chern insulators. A common approach to study interacting ground states at integer fillings is the Hartree-Fock mean-field method. However, this method neglects dynamical correlations, which often leads to an overestimation of spontaneous symmetry breaking and fails to provide quantitative descriptions of single-particle excitations. This work introduces a general many-body perturbation framework for moiré systems, combining all-band Hartree-Fock calculations with $GW$ quasiparticle corrections and random-phase approximation (RPA) correlation energies. We apply this framework to hexagonal boron nitride-aligned rhombohedral pentalayer graphene and magic-angle twisted-bilayer graphene (MATBG). We show that incorporating RPA correlation energy and $GW$ self-energy corrections yields phase diagrams and single-particle spectra that quantitatively align with experimental measurements for both systems. Particularly, the ground state at charge neutrality of MATBG is predicted to be a nematic metal, which is stabilized over Kramers intervalley coherent insulator due to lower correlation energy. Our versatile framework provides a systematic beyond-mean-field approach applicable to generic moiré systems.

Phonons can carry angular momentum and exhibit chirality through the circular polarization of atomic motion. This enables a phonon-mediated spin Seebeck effect (SSE) via the conversion of phonon angular momentum into electron spin angular momentum. In this Letter, we develop a theoretical framework for calculating the spin current in a normal-metal–chiral-insulator (NM-CI) heterostructure within the nonequilibrium Green's function formalism. We discuss the influence of (i) the thermal bias across the NM-CI interface, (ii) the chemical potential of the NM, and (iii) the modification of the interfacial on-site potential on the spin-transport properties. We identify two characteristic nonlinear spin-transport phenomena: negative differential SSE and spin-current rectification. The negative differential SSE arises from the competition between the thermal bias and the density of thermally excited electrons. Spin-current rectification suggests the possibility of realizing a thermally controlled spin diode. We also find that the spin-transport behavior is closely associated with an effective interfacial spectral density. This work suggests an alternative route toward thermally controlled spintronic devices using chiral phonons.