We study flat bands and their topology in 2D materials with quadratic band crossing points under periodic strain. In contrast to Dirac graphene, where strain acts as a vector potential, for serves director potential angular momentum ℓ=2. prove that when the strengths of fields hit certain "magic" values, exact C=±1 emerge at charge neutrality point chiral limit, strong analogy magic angle twisted-bilayer graphene. These have ideal quantum geometry realization fractional Chern insulators,...

Abstract Topological insulators hold promises to realize exotic quantum phenomena in electronic, photonic, and phononic systems. Conventionally, topological indices, such as winding numbers, have been used predict the number of topologically protected domain-wall states (TPDWSs) insulators, a signature phenomenon called bulk-edge correspondence. Here, we demonstrate theoretically experimentally that TPDWSs mechanical Su-Schrieffer-Heeger (SSH) model can be higher than depending on strengths...

Topological mechanical metamaterials have enabled new ways to control stress and deformation propagation. Exemplified by Maxwell lattices, they been studied extensively using a linearized formalism. Herein, we study two-dimensional topological lattice exploring its large quasi-static response geometric numerical simulations experiments. We observe spatial nonlinear wave-like phenomena such as harmonic generation, localized domain switching, amplification-enhanced frequency conversion,...

Recent years have seen the discovery of systems featuring fragile topological states. These states matter lack certain protection attributes typically associated with topology and are therefore characterized by weaker signatures that make them elusive to observe. Moreover, they confined special symmetry classes and, in general, rarely studied context phononic media. In this Letter, we theoretically predict emergence bands spectrum a twisted kagome elastic lattice threefold rotational...

The flat band is a key ingredient for the realization of interesting quantum states functionalities. In this paper, we investigate conditions in both monolayer and bilayer graphene under periodic strain. We find topological nearly bands with homogeneous distribution Berry curvature systems. metric closely resembles that Landau levels. For graphene, strain field can be regarded as an effective gauge field, while Bernal-stacked ($\mathit{AB}$-stacked) its role beyond description field. also...

We hypothesized that maternal intrapartum antibiotic treatment delays the growth of organism in blood culture obtained during work-up for infants with suspected early-onset sepsis (EOS).Single center, retrospective review culture-proven EOS over 13.5 years period. was defined by isolation a pathogen from within 72 hours birth and ≥ 5 days.Among 81 positive cultures, 38 were deemed to have 43 contaminants. The organisms grown as follows: Escherichia coli 17 infants, Group B streptococcus 10...

In this paper a blind deconvolution method is proposed which allows the of broad-band signals that pass through low-pass device by combining homomorphic and Van Cittert iterative techniques. The has been successfully applied on both synthetic experimental data obtained from chromatography deep level transient spectroscopy (DLTS).

Elastic materials with holes and inclusions can deform in various ways response to applied external loads. The authors present a theory for such deformations, using an analogy the concepts of polarization multipoles electrostatics. They apply infinite, two-dimensional solids circular voids inclusions, provide set experimental tests.

We present a method for predicting the linear response deformation of finite and semi-infinite 2D solid structures with circular holes inclusions by employing analogies image charges induction in electrostatics. Charges electrostatics induce near conductive boundaries an external electric field induces polarization (dipoles, quadrupoles, other multipoles) dielectric objects. Similarly, elasticity stress (quadrupoles inside inclusions. Stresses generated these induced elastic multipoles as...

Maxwell lattices, where the number of degrees freedom equals constraints, are known to host topologically protected zero-frequency modes and states self-stress, characterized by a topological index called polarization. In this Letter, we show that in addition these modes, with help mirror symmetry, inherent chiral symmetry lattices creates another index, mirror-graded winding (MGWN). This MGWN is higher-order which gives rise zero self-stress at mirror-invariant domain walls corners between...

Introduction Yoga has been demonstrated to have a range of beneficial effects on individuals with substance use disorders, including opioid disorders. We initiated randomized clinical trial find out the efficacy add-on yoga among patients dependence stabilized treatment whether it led improvement in sleep and quality life. However, rate enrolment into study was quite low. Objectives In this interim analysis, we present preliminary data reasons for non-enrolment trial. Methods The...

Origami principles are used to create strong, lightweight structures with complex mechanical response. However, identifying the fundamental physical that determine a sheet's behavior remains challenge. We introduce new analytic theory in which commonly studied origami sheets fall into distinct topological classes predict sharply varying behavior, including effective stiffness and smoothness of response under external loads. negative Poisson's ratios, such as Miura ori, have conventional,...

We report high-throughput, ultra-fast laser sintering of alumina sample array and characterization units' microstructure hardness, as a fast exploration processing parameters, microstructure, property. These experimental data were used to train machine-learning (ML) models. Accurate ML predictions demonstrated for the processing-microstructure-property relationship, specifically in (1) prediction under arbitrary power (2) expected from desired hardness. An independent neural network was...

Topological mechanical metamaterials have enabled new ways to control stress and deformation propagation. Exemplified by Maxwell lattices, they been studied extensively using a linearized formalism. Herein, we study two-dimensional topological lattice exploring its large quasi-static response geometric numerical simulations experiments. We observe spatial nonlinear wave-like phenomena such as harmonic generation, localized domain switching, amplification-enhanced frequency conversion,...

Recent studies on topological flat bands and their fractional states have revealed increasing similarities between moir\'e Landau levels (LLs). For instance, like the lowest LL, exact with ideal quantum geometry can be constructed using same holomorphic function structure, $\psi_{\mathbf{k}} = f_{\mathbf{k}-\mathbf{k}_0}(z) \psi_{\mathbf{k}_0}$, where $f_{\mathbf{k}}(z)$ is a function. This structure has been foundation of existing knowledge constructing bands. In this Letter, we report new...

The flat band is a key ingredient for the realization of interesting quantum states novel functionalities. In this work, we investigate conditions in both monolayer and bilayer graphene under periodic strain. We find topological nearly bands with homogeneous distribution Berry curvature systems. metric closely resembles that Landau levels. For graphene, strain field can be regarded as an effective gauge field, while Bernal-stacked (AB-stacked) its role beyond description field. also provide...

In the light of recent advances in material informatics, there is a great demand for high-throughput approaches sample fabrication and property characterization. Currently, no approach has been demonstrated fast sampling microstructure correlated properties. this paper, we demonstrate ultra-fast an alumina array hardness characterization these units. The was fabricated using picosecond (PS) laser micromachining CO2 sintering within short time (i.e., less than few minutes). After sintering,...

Maxwell lattices, where the number of degrees freedom equals constraints, are known to host topologically-protected zero-frequency modes and states self stress, characterized by a topological index called polarization. In this letter, we show that in addition these modes, with help mirror symmetry, inherent chiral symmetry lattices creates another index, mirror-graded winding (MGWN). This MGWN is higher order which gives rise zero stress at mirror-invariant domain walls corners between two...

Topological insulators hold promises to realize exotic quantum phenomena in electronic, photonic, and phononic systems. Conventionally, topological indices, such as winding numbers, have been used predict the number of topologically protected domain-wall states (TPDWSs) insulators, a signature phenomenon called bulk-edge correspondence. Here, we demonstrate theoretically experimentally that TPDWSs mechanical Su-Schrieffer-Heeger (SSH) model can be higher than depending on strengths...

We investigate the effect of thermal fluctuations on mechanical properties nanotubes by employing tools from statistical physics. For 2D sheets it was previously shown that effectively renormalize elastic moduli beyond a characteristic temperature-dependent length scale (a few nanometers for graphene at room temperature), where bending rigidity increases, while in-plane reduce in scale-dependent fashion with universal power law exponents. However, curvature produces new phenomena. In...