We predict the existence of anisotropic spin-transfer torque effect in textured altermagnets. To this end, we generalize the Zhang-Li torque to incorporate the symmetry associated with prototypical $d$-wave altermagnets and identify the spin-splitter adiabatic and nonadiabatic torques. Applying our results to domain wall dynamics induced by spin-transfer torque, we find that, in certain regimes, the spin-splitter adiabatic torque can induce domain wall precession, significantly slowing down domain wall motion. The response of the domain wall also becomes anisotropic, reflecting the $d$-wave symmetry of the altermagnet. Furthermore, we observe that the spin-splitter adiabatic torque modifies skyrmion dynamics, inducing anisotropic skyrmion Hall effect. The above phenomena can serve as a hallmark of altermagnetism in textured magnets, distinguishing it from the behavior of ordinary antiferromagnets.

Skin effects, the phenomena of the bulk states collapsing toward open boundaries, have mostly been revealed in non-Hermitian systems hosting nonreciprocity. Either the first-order or the higher-order of skin effects have been observed. Here, we report our first discovery of a hybrid-order of skin effects, of which the utilized two-dimensional system exhibits not only the first-order skin modes, but also the second-order skin modes respectively on the edges and the corners, the different type of open boundaries. We propose a universal approach to achieving nonreciprocal couplings by virtue of the loss and bilayer degree of freedom, as the critical role it plays. Our models are implemented in square- and diamond-shaped phononic crystals, and the hybrid order of acoustic skin modes is evidenced in experiment. Our Letter may foster the development of non-Hermitian physics.

We present results from data acquired by the SENSEI experiment at SNOLAB after a major upgrade in May 2023, which includes deploying 16 new sensors and replacing the copper trays that house the CCDs with a new light-tight design. We observe a single-electron event rate of $(1.39\pm 0.11)\times {10}^{-5}{\mathrm{e}}^{-}/\mathrm{pix}/\mathrm{day}$, corresponding to $(39.8\pm 3.1){\mathrm{e}}^{-}/\mathrm{gram}/\mathrm{day}$. This is an order-of-magnitude improvement compared to the previous lowest single-electron rate in a silicon detector and the lowest for any photon detector in the wavelength range between near-infrared and ultraviolet. We use these data to obtain a 90% confidence level upper bound of $1.53\times {10}^{-5}{\mathrm{e}}^{-}/\mathrm{pix}/\mathrm{day}$ and to set constraints on sub-GeV dark matter candidates that produce single-electron events. We hypothesize that the data taken at SNOLAB in the previous run, with an older tray design for the sensors, contained a larger rate of single-electron events due to light leaks. We test this hypothesis using data from the SENSEI detector located in the MINOS cavern at Fermilab.

We present a novel constraint on light dark matter utilizing 1.54 metric ton/year of data acquired from the PandaX-4T dual-phase xenon time projection chamber. This constraint is derived through detecting electronic recoil signals resulting from the interaction with solar-enhanced dark matter flux. Low-mass dark matter particles, lighter than a few $\mathrm{MeV}/c^2$, can scatter with the thermal electrons in the Sun. Consequently, with higher kinetic energy, the boosted dark matter component becomes detectable via contact scattering with xenon electrons, resulting in a few keV energy deposition that exceeds the threshold of PandaX-4T. We calculate the expected recoil energy in PandaX-4T considering the Sun’s acceleration with heavy mediators and the detection capabilities of the xenon detector. The first experimental search results using the xenon detector yield the most stringent upper limits cross section of $3.51\times {10}^{-39}{\mathrm{cm}}^2$ at $0.08\mathrm{MeV}/c^2$ for a solar boosted dark matter mass ranging from 0.02 to $10\mathrm{MeV}/c^2$, achieving a 23-fold improvement compared with earlier experimental studies.

We report the first double-differential cross section measurement of neutral-current neutral pion ($\mathrm{NC}{\pi }^0$) production in neutrino-argon scattering, as well as single-differential measurements of the same channel in terms of final states with and without protons. The kinematic variables of interest for these measurements are the ${\pi }^0$ momentum and the ${\pi }^0$ scattering angle with respect to the neutrino beam. A total of 4971 candidate $\mathrm{NC}{\pi }^0$ events fully contained within the MicroBooNE detector are selected using data collected at a mean neutrino energy of $\sim 0.8\mathrm{GeV}$ from $6.4\times {10}^{20}$ protons on target from the Booster Neutrino Beam at the Fermi National Accelerator Laboratory. After extensive data-driven model validation to ensure unbiased unfolding, the Wiener-singular-value-decomposition method is used to extract nominal flux-averaged cross sections. The results are compared to predictions from commonly used neutrino event generators, which tend to overpredict the measured $\mathrm{NC}{\pi }^0$ cross section, especially in the $0.2–0.5\mathrm{GeV}/\mathrm{c}$ ${\pi }^0$ momentum range and at forward scattering angles. Events with at least one proton present in the final state are also underestimated. This data will help improve the modeling of $\mathrm{NC}{\pi }^0$ production, which represents a major background in measurements of charge-parity violation in the neutrino sector and in searches for new physics beyond the standard model.

We present a systematic ab initio study of the low-lying states in beryllium isotopes from ${}^7\mathrm{Be}$ to ${}^{12}\mathrm{Be}$ using nuclear lattice effective field theory with the ${\mathrm{N}}^3\mathrm{LO}$ interaction. Our calculations achieve good agreement with experimental data for energies, radii, and electromagnetic properties. We introduce a novel, model-independent method to quantify nuclear shapes, uncovering a distinct pattern in the interplay between positive and negative parity states across the isotopic chain. By combining Monte Carlo sampling of the many-body density operator with a novel nucleon-grouping algorithm, the prominent two-center cluster structures, the emergence of one-neutron halo, complex nuclear molecular dynamics such as $\pi$ orbital and $\sigma$ orbital, emerge naturally.

We present the first measurement of the ${}^{47}\mathrm{K}(d,p\gamma ){}^{48}\mathrm{K}$ transfer reaction, performed in inverse kinematics using a reaccelerated beam of ${}^{47}\mathrm{K}$. The level scheme of ${}^{48}\mathrm{K}$ has been greatly extended, with nine new bound excited states identified and spectroscopic factors deduced. Uniquely, the ${}^{47}\mathrm{K}(d,p)$ reaction gives access to nuclear states that are sensitive to the interaction of protons and neutrons in the widely spaced $1s$ and $fp$ orbitals, respectively. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies between theory and experiment. Intriguingly, a systematic overestimation of spectroscopic factors and a poor reproduction of the energies for $1^{-}$ states suggests that the mixing between the $\pi s_{1/2}^1{d}_{3/2}^4$ and $\pi s_{1/2}^2{d}_{3/2}^3$ proton configurations in ${}^{48}\mathrm{K}$ is not correctly described using current interactions, challenging our description of light nuclei around the $N=28$ island of inversion.

The spin polarization of photoelectrons in tunneling ionization is investigated using numerical solutions of the time-dependent Schrödinger equation in companion with our analytic treatment via the spin-resolved strong-field approximation and classical trajectory Monte Carlo simulations. We demonstrate a nontrivial spin texture of photoelectrons in momentum space, exhibiting a vortex structure relative to the laser polarization axis. The momentum-resolved polarization stems from the emergence of spin-correlated quantum orbits in the continuum. For direct electrons in few-cycle pulses, the nonvanishing initial transverse velocity of the electron is responsible for the polarization, while in long pulses, the spin texture is essentially shaped by recollisions. Furthermore, the interference between direct and rescattering ionization leads to spin-polarized electron holography, offering an alternative method to extract atomic fine structural information.

The statistics of electron transport in a quantum conductor is affected by fluctuations of its voltage bias. Here, we show experimentally how a third order correlation in the electromagnetic field arises from the noise of a tunnel junction in the microwave domain being modulated by the vacuum fluctuations generated by a resistor at ultralow temperature. This provides a way to measure the vacuum fluctuations experienced by the junction, not offset by the unavoidable noise added by the detection setup.

We demonstrate that two-dimensional Kramers-Weyl fermions can be engineered in spin-orbit coupled twisted bilayers, where the chiral structure of these moiré systems breaks all mirror symmetries, confining Kramers-Weyl fermions to high-symmetry points in the Brillouin zone under time reversal symmetry. Our theoretical analysis reveals a symmetry-enforced, Weyl-like spinful interlayer moiré coupling that universally ensures an ideal radial spin-texture at arbitrary twist angles, under $C_{nz}$ symmetry with $n>2$. First principles density functional calculation confirm the realization of these fermions in twisted $\alpha \text{−}{\mathrm{In}}_2{\mathrm{Se}}_3$ homobilayers, where flat bands and out-of-plane ferroelectric polarization in each layer guarantee two-dimensional Kramers-Weyl physics with ideal radial spin textures.

Taylor’s law (TL), the scaling relationship between mean and variance, has been observed in various fields. However, the underlying reasons for the widespread occurrence of TL, the frequent appearance of the TL exponent value close to 2, and the relationship between temporal and spatial TLs are not fully understood. Here, using coupled oscillator models, we analytically and numerically demonstrate that synchronization can induce TL. In particular, we show that strong synchronization leads to waveform proportionality, resulting in temporal and spatial TLs with an exponent 2. Our results can help infer the existence of synchronization solely from the correlation between mean and variance.