Physical Review B

The authors propose here a route to the superconducting diode effect through nonreciprocal magnetic domain-wall dynamics in ferromagnetic superconductors. Applied magnetic fields break time-reversal and inversion symmetries, producing direction-dependent critical currents for Walker breakdown—the onset of sustained domain-wall precession. Owing to the order parameter redundancy, the precession generates nonsingular phase slips. By connecting magnetic dynamics with superconducting transport, the authors identify a mechanism for realizing the superconducting diode effect without the need for complex heterostructures.

Spin defects are promising building blocks for quantum technologies, but predicting how atomic vibrations reshape their electronic spectra remains challenging. Here, the authors employ a first-principles cumulant Green’s function approach that captures repeated phonon emission and absorption. For the negatively charged nitrogen-vacancy center in diamond, quantum zero-point motion produces multiphonon satellites spanning 400 meV even at zero temperature. The satellite energies and intensities depend strongly on spin and orbital character, revealing how individual defect states interact with the surrounding lattice.

Altermagnetism arises from the breaking of time-reversal symmetry in antiferromagnets, leading to spin-band splitting. However, recent reports indicate inconsistencies in its observation in strongly correlated materials. Here, the authors employ dynamical mean-field theory to show that strong correlations in MnF${}_2$ suppress spin-band splitting, whereas MnTe exhibits significant spin-band splitting due to both strong correlations and sizable ligand hybridization, establishing it as an ideal altermagnetic candidate. These findings provide a pathway for designing altermagnets in strongly correlated systems.

The authors study here the field-reentrant superconducting phase of the unconventional superconductor UTe${}_2$ using ultrasound measurements up to 77 T and down to 0.5 K. They find clear signatures of the field reentrant superconducting phase found for a field angle of 30 degrees from the $b$ to the $c$ axis in a longitudinal elastic mode, establishing the bulk nature of this superconducting phase. The authors observe an intriguing excess attenuation across the superconducting phase, which suggests unusual vortex dynamics and pinning mechanisms.

Aperiodic tilings lie between crystalline order and disorder, giving rise to unusual wave phenomena. Here, the authors investigate 2D wave transport in the recently discovered Hat monotile based on exciton-polariton lattices, revealing localized, critical, and extended states within its fractal spectrum. Simulations reveal anomalous wave spreading, ranging from superdiffusive to near-subdiffusive transport. The authors propose an optical pump-probe approach to explore these effects experimentally, opening new avenues for studying critical phenomena in reconfigurable polariton lattices.

Here, the authors substantially update the high-field magnetic phase diagram of SrFeO${}_3$, which hosts a hedgehog–antihedgehog lattice. Most strikingly, they uncover a first-order metamagnetic transition into the forced ferromagnetic phase, accompanied by negative volume magnetostriction and dramatic elastic softening. These anomalous magnetoelastic responses signal changes in charge degrees of freedom, shedding new light on the role of ligand holes in helical magnetism.

The author predicts here the spin thermal Hall effect in nonreciprocal photonic many-body systems, where radiative heat transport generates a transverse accumulation of photon spin angular momentum. This effect and its inverse are shown to form an Onsager–Casimir reciprocal pair, establishing a fundamental connection between heat and photon-spin transport. Thermodynamic constraints further reveal universal bounds on spin–heat conversion and introduce a figure of merit for its efficiency, opening new perspectives for spin-controlled thermal radiation and photonic thermal devices.

Here, the authors investigate electrical transport in twisted double bilayer graphene (TDBG) on the antiferromagnetic material CrOCl (COC). At ultrahigh magnetic fields, an enhanced correlated insulating state is observed at half-filling of TDBG, which is attributed to the charge transfer effect between TDBG and COC. The authors further characterize the behavior of the correlated state by systematic temperature- and magnetic-field dependent measurements. Their results highlight the interfacial charge-related effect as a promising approach to manipulating the correlated states in moiré systems.

Realizing scalable Kitaev chains requires precise control over superconducting phases, to remove unwanted domain walls from the system. Here, the authors investigate two new control mechanisms for this purpose: tuning the spin state of the quantum dots and adjusting the charge of the Andreev bound state. Both approaches enable phase control without external magnetic flux, offering a potential route toward scalable architectures. The authors study spatially varying spin-orbit coupling as a potential cause of deviations from ideal $\pi$ phase shifts, revealing important challenges for future device design.

Here, the authors demonstrate that an applied direct electric field lifts the symmetry constraint on the nonlinear anomalous Nernst effect, enabling this effect in time-reversal symmetric 2D systems with crystallographic symmetries beyond a single mirror symmetry. They propose an alternating temperature gradient, rather than a steady one, as a driving force, allowing experimental detection via second-harmonic measurements. This finding broadens the material platform for quantum-geometry-induced transverse thermoelectric effects and provides an alternative route for thermoelectric energy harvesting.

Here, the authors reveal how curvature reshapes spin-wave dynamics and magnetic instabilities in synthetic antiferromagnetic nanotubes. The tubular geometry produces asymmetric mode localization and nonreciprocal propagation, while radial anisotropy drives a crossover from uniform softening to a finite-wave-vector instability. The latter signals the emergence of a stripe-like magnetic modulation along the nanotube axis.

Superconductor–semiconductor coupling plays a crucial role in realizing Majorana zero modes in hybrid nanowire devices. Here, the authors demonstrate controllable and tunable coupling in PbTe–Pb hybrid nanowires. More importantly, they establish a direct connection between the coupling strength and the emergence of robust zero modes. These findings provide valuable insights into engineering Majorana zero modes in this promising material platform.

A quantum point contact between fractional quantum Hall states with different fillings can act as a dissipationless voltage transformer and provide a physical realization of the boundary sine-Gordon model. However, the microscopic understanding across the full range of transmission has remained unclear, complicating the interpretation of a recent experiment. Here, the authors use analytical and tensor network calculations of a sliding charge density wave to solve this open problem and quantitatively connect the conductance to the boundary sine-Gordon model.

While altermagnets have been primarily studied for their magnetic properties, another important aspect is the impact of strong quantum fluctuations that can lead to the loss of magnetic order. Here, the authors construct exactly solvable models for quantum-disordered altermagnets. They identify altermagnetic spin liquids—states that preserve spin-rotation and translation symmetries, yet break time-reversal symmetry through orbital moments, whose net value vanishes by symmetry— and study their excitations, and competing phases.

Can electronic band topology leave a fingerprint in thermal radiation? Here, the authors theoretically show that the evolution from a nodal point to a nodal ring shifts spectral heat flux to higher frequencies and reduces the contribution of large-wave-vector photon tunneling channels. Together, these effects broaden the near-field radiation spectrum while suppressing heat transfer. The resulting temperature-sensitive radiative response connects topological electronic states with nanoscale energy modulation and offers a platform for thermal switching, thermal rectification, and thermal stabilization.

Long celebrated in graphene, Dirac physics inspires the search for similar phenomena in magnonic systems. Here, the authors experimentally demonstrate that magnons in an epitaxial Co bilayer on Ru(0001) exhibit Dirac properties near the Brillouin zone corner. Remarkably, the substrate does not destroy the essential physics; despite breaking sublattice symmetry and opening a gap, local valley topology remains intact. Beyond opening possibilities for discovering Dirac magnons in other ultrathin 3$d$ magnetic films, these findings hold promise for on-chip magnonic applications.

Strong disorder normally favors spin-glass freezing. Here, in contrast, the authors report an unconventional, highly fluctuating spin state in cubic γ-Ba${}_3$CoNb${}_2$O${}_9$ with effective spin-½ moments randomly diluted to just above the percolation limit. Neutron and muon measurements, with partially overlapping time windows, surprisingly reveal persistent correlated spin fluctuations from picoseconds to microseconds—a behavior reminiscent of quantum spin liquids. Numerical calculations suggest singlet formation is important. These results show disorder can sustain dynamic spin correlations even without strong geometrical frustration.

The authors report here two finite zero-field Hall resistivity tensor components associated with the debated magnetic ground state of the noncollinear antiferromagnet UNi${}_4$B. For a commensurate magnetic structure, the finite Hall resistivity components cannot be explained by the formation of magnetic domains but are compatible with a monoclinic magnetic symmetry lower than that of previously proposed magnetic ordering models. Additional field-dependent Hall resistivity data collected up to 16 T suggest a notable intrinsic contribution to the anomalous Hall effect.