Higher-order topological insulator (HOTI) represents a new phase of matter, the characterization which goes beyond conventional bulk-boundary correspondence and is attracting significant attention by broad community. Using square-root operation, it has been suggested that HOTI may emerge in hybrid honeycomb-kagome lattice. Here, we report first experimental realization LC circuits. We show theoretically experimentally inherits feature wave function from its parent, with corner states pinned...

The mathematical foundation of quantum mechanics is built on linear algebra, while the application nonlinear operators can lead to outstanding discoveries under some circumstances. In this Letter, we propose a model square-root higher-order Weyl semimetal (SHOWS) by inheriting features from its parent Hamiltonians. It found that SHOWS hosts both "Fermi-arc" surface and hinge states connect projection points. We theoretically construct experimentally observe exotic state in three-dimensional...

Magnetic skyrmions are chiral quasiparticles that show promise for future spintronic applications such as skyrmion racetrack memories and logic devices because of their topological stability, small size (typically ∼ 3 -500 nm), ultralow threshold force to drive motion.On the other hand, ability light carry deliver orbital angular momentum (OAM) in form optical vortices has attracted a lot interest.In this work, we predict photonic OAM transfer effect, by studying dynamics magnetic subject...

We present a theoretical mapping to show that ferromagnet with gain (loss) is equivalent an antiferromagnet equal amount of loss (gain). Our findings indicate novel first-order ferromagnet-antiferromagnet phase transition by tuning the gain-loss parameter. As appealing application, we demonstrate realization as well manipulation antiferromagnetic Skyrmion, stable topological quasiparticle not yet observed experimentally, in chiral ferromagnetic thin film gain. also consider bilayers balanced...

Magnetometers with exceptional sensitivity are highly demanded in solving a variety of physical and engineering problems, such as measuring Earth's weak magnetic fields prospecting mineral deposits geological structures. It has been shown that the non-Hermitian degeneracy at points (EPs) can provide new route for purpose, because nonlinear response to external perturbations. One recent work [H. Yang et al., Phys. Rev. Lett. 121, 197201 (2018)] made first step realize second-order magnonic EP...

We report the experimental realization of a two-dimensional (2D) weak topological insulator (WTI) in spinless Su-Schrieffer-Heeger circuits with parity-time and chiral symmetries. Strong Z2 indexes are adopted to explain findings that Dirac semimetal (DSM) phase four WTI phases emerge turn when we modulate centrosymmetric circuit deformations. In DSM phase, it is found cone highly anisotropic not pinned any high-symmetry points but can widely move within Brillouin zone, which eventually...

Abstract The Wilson fermion (WF) is a fundamental particle in the theory of quantum chromodynamics. Theoretical calculations have shown that WF with half skyrmion profile represents anomalous semimetal phase supporting chiral edge current, but experimental evidence still lacking. In this work, we report direct observation circuit systems. We find WFs manifest as topological spin textures analogous to skyrmion, half-skyrmion pair, and Néel structures, depending on their mass. Transformations...

Magnetic skyrmions are believed to be the promising candidate of information carriers in spintronics. However, skyrmion Hall effect due nontrivial topology can induce a accumulation or even annihilation at edge devices, which hinders real-world applications skyrmions. In this work, we theoretically investigate current-driven motion on magnetic nanotubes regarded as "edgeless" tangential direction. By performing micromagnetic simulations, find that exhibits helical trajectory nanotube, with...

We implement the topological semimetal state generated by square-root operation in electrical circuits. In this system, energy bands intersect at finite energies, with properties originating from parent Hamiltonian. By designing a ribbon circuit, we observe edge and measure its frequency spectrum directly, nature of which is characterized winding number. Compared to bidirectional semimetals that cannot transmit information single direction, there also considerable interest unidirectional...

In magnetic trilayer structures, a contribution to the Gilbert damping of ferromagnetic resonance arises from spin currents pumped one layer another. This has been demonstrated for layers with weakly coupled, separated resonances, where magnetization dynamics are excited predominantly in and other acts as sink. Here we show that structures which magnetizations simultaneously, antisymmetrically, spin-pumping effect roughly twice large. The antisymmetric (optical) mode antiferromagnetically...

We predict a novel twisted skyrmion structure at the boundary of two antiferromagnetically coupled magnetic domains with antiparallel magnetization directions. Through this intermediate state, skyrmions opposite polarities can be freely switched between each other by spin-polarized electric currents. Based on these findings, we propose concept double-track racetrack memory and logic gates where binary data are represented different polarities. The dynamics polarity reversal is theoretically...

We theoretically investigate the dynamics of atomic domain walls (DWs) in antiferromagnets driven by a spin-orbit field. For DW with width few lattice constants, we identify Peierls-like pinning effect, depinning field exponentially decaying width, so that moderately larger than threshold can drive propagation an step-wise manner. broad DW, Peierls is negligibly small. However, external induce fast propagation, accompanied significant shrinking its down to scales. Before stepping into...

Long-range interactions (LRIs) are ubiquitous in nature. Higher-order topological (HOT) insulator represents a new phase of matter. A critical issue is how LRI dictates the HOT phases. In this work, we discover four topologically distinct phases, i.e., phase, bound state continuum, Dirac semimetal (DSM) and trivial breathing kagome circuit with tunable LRIs. We find an emerging type-III corner which splits from edge continuum originates strong couplings between nodes at different edges....

The authors observe the second-order corner states pinned to zero energy that is characterized by Z3 Berry phase in platform of topolectrical circuits. They examine topological robustness modes against both chiral-symmetry conserving and breaking disturbances introducing extra capacitors within sublattices electrical-circuit experiments.

Exploring topological phases in non-Hermitian systems has attracted significant recent attention. One intriguing question is how edge states compete with the skin effect. Here we report experimental observation of corner a two-dimensional nonreciprocal rhombus honeycomb electric circuit. We construct and circuits by introducing current-direction resolved capacitance between two nodes depending on current direction. A effect thus emerges due to nonreciprocity prevails dragging state into...

The effects of using different interatomic potentials in molecular dynamics (MD) simulations the formation He-vacancy clusters within displacement cascades α-Fe are investigated two sets potentials. Simulations produced by primary knock-on atoms energy Ep=1–20keV were performed containing a concentration substitutional He varying from 1to5at.% at an irradiation temperature 100K. Although on nucleation induced relatively small, number and size significantly for employed this study. Thus,...

We report the experimental observation of second-order corner states in a two-dimensional breathing honeycomb topolectrical circuit with sixfold rotational symmetry C6 through voltage measurements. The topological originate from nontrivial bulk topology, which can be characterized by invariant associated rotation eigenspectrum. confirm two types states, both symmetry, while one them is specially pinned to zero admittance because emerging chiral protection. then examine robustness modes...

We formulate a strong-coupling theory for perpendicular standing spin waves (PSSWs) in ferromagnetic bilayers with the interlayer exchange coupling (IEC). Employing Hoffmann boundary condition and energy-flow continuity across interface, we show that PSSWs are still quantized but non-integral quantum numbers, sharp contrast to of single layer. The magnon-magnon is characterized by spectrum splitting which linear IEC weak-coupling region, getting saturated limit. Analytical predictions...

It is a conventional wisdom that the helical edge states of quantum spin Hall (QSH) insulator are particularly stable due to topological protection time-reversal symmetry. Here, we report first experimental observation an edge-dependent (pseudo-)spin effect by employing two Kekule electric circuits with molecule-zigzag and partially-bearded edges, where chirality circulating current in unit cell mimics electron spin. We observe helicity flipping in-gap modes emerging opposite parameter...

Long-distance strong coupling between short-wavelength magnons remains an outstanding challenge in quantum magnonics, emerging interdiscipline magnonics and information science. Recently, altermagnets are identified as the third elementary class of magnets that break time-reversal symmetry without magnetization thus combine characteristics conventional collinear ferromagnets antiferromagnets. In this work, we show cavity photons can mediate long-distance exchange with opposite chiralities...

It is conventional wisdom that a left-hand microwave cannot efficiently excite the spin wave (SW) in ferromagnet due to constraint of angular momentum conservation. In this work, we show can drive nonreciprocal SWs presence strong ellipticity mismatch between and precessing magnetization. A compensation frequency predicted, at which SWs. Away from it SW amplitude sensitively depends on ellipticity, sharp contrast case driven by right-hand microwaves. By tuning driving frequency, observe...