We propose a realization of the lattice-symmetry-assisted second-order topological superconductors with corner Majorana zero modes (MZM) based on two-dimensional insulators (2DTI). The lattice symmetry can naturally lead to anisotropic coupling edge states along different directions in-plane magnetic field and conventional $s$-wave pairings, thus leading single MZM located at corners for various patterns. In particular, we focus 2DTI ${D}_{3d}$ found types gap opening armchair zigzag edges...

Using machine learning, the inverse design of color printing is efficiently achieved. For a desired color, suitable geometry finally found through reinforcement learning.

Epitaxial semiconductor-superconductor (SM-SC) hybrid nanowires are potential candidates for implementing Majorana qubits. Recent experimental and theoretical works show that charged impurities in SM remain a major problem all existing nanowires, which the is either InAs or InSb while SC mainly Al. Here, we theoretically validate recently proposed PbTe-Pb nanowire as candidate devices. By studying electrostatic electronic properties of PbTe demonstrate huge dielectric constant endows itself...

In this work, we develop a systematic approach of constructing and classifying the model Hamiltonians for two-dimensional (2D) higher-order topological phase with corner zero-energy states (CZESs). Our is based on direct construction an analytical solution CZESs in series 2D systems stacking 1D extended Su-Schrieffer-Heeger (SSH) model, two copies two-band SSH along orthogonal directions. Fascinatingly, our not only gives celebrated Benalcazar-Bernevig-Hughes models but also reveals novel...

Based on recently synthesized Ni3C12S12 class 2D metal-organic frameworks, we predict electronic properties of M3C12S12 and M3C12O12, where M is Zn, Cd, Hg, Be, or Mg with no orbital contributions to bands near Fermi level. For M3C12S12, their band structures exhibit double Dirac cones different velocities that are n p type, respectively, which switchable by few-percent strain. The crossing two symmetry-protected be non-hybridizing, leading independent channels in node-line semimetals at the...

A monolayer of the high-$T_c$ superconductor FeTe$_{1-x}$Se$_x$ has been predicted to realize a topologically non-trivial state with helical edge modes at its boundary, providing novel intrinsic system search for topological superconductivity and Majorana zero modes. Evidence in favor phase transition identified recent experiments \cite{Peng2019}. We propose create by applying an in-plane magnetic field tuning local chemical potential via electric gating. Owing anisotropic couplings on edges...

One key difficulty in realizing Majorana zero modes (MZMs) is the required high magnetic field, which causes serious issues, e.g., shrinks superconducting gap, reduces topological region, and weakens their robustness against disorders. In this Letter, we propose that Meissner effect can bring phase to a superconductor/topological-insulator/superconductor (SC/TI/SC) hybrid system. Remarkably, field strength (<10 mT) support MZMs has been reduced by several orders of magnitude compared (>0.5...

Implementing topological superconductivity (TSC) and Majorana states (MSs) is one of the most significant challenging tasks in both fundamental physics quantum computations. In this work, taking obstructed atomic insulator (OAI) ${\mathrm{Nb}}_{3}{\mathrm{Br}}_{8}$, $s$-wave superconductor (SC) ${\mathrm{NbSe}}_{2}$, ferromagnetic (FMI) ${\mathrm{CrI}}_{3}$ as an example, we propose a new setup to realize 2D chiral TSC MSs SC/OAI/FMI heterostructure, which could avoid subband problem...

Flat bands (FBs) in materials can enhance the correlation effects, resulting exotic phenomena. Line-graph (LG) lattices are well known for hosting FBs with isotropic hoppings s-orbital models. Despite their prevalent application kagome metals, there has been a lack of general approach incorporating higher-angular-momentum orbitals spin-orbit couplings into LGs to achieve FBs. Here, we introduce non-Abelian LG theory construct realistic systems, which incorporates internal degrees freedom and...

Silkworm (Bombyx mori) is a lepidopteran-holometabolic model organism. To understand its developmental biochemistry, we characterized the larval hemolymph metabonome from third instar to prepupa stage using 1H NMR spectroscopy whilst fatty acid composition GC-FID/MS. We unambiguously assigned more than 60 metabolites, among which tyrosine-o-β-glucuronide, mesaconate, homocarnosine, and picolinate were reported for first time silkworm hemolymph. Phosphorylcholine was most abundant metabolite...

Proximity-effect-induced superconductivity was studied in epitaxial topological insulator Bi2Se3 thin films grown on superconducting NbSe2 single crystals. A point contact spectroscopy (PCS) method used at low temperatures down to 40 mK. An induced gap observed the spectra, which decreased with increasing layer thickness, consistent proximity effect bulk states of by NbSe2. At very temperatures, an extra feature may correspond a second energy appeared spectrum. For 16 quintuple sample, state...

We establish that Majorana fermions on the boundary of topological superconductors have only spin-triplet superconducting correlations independent whether bulk gap is spin singlet or triplet. This universal for time-reversal broken (respected) (TSCs) with an odd number (pairs of) boundary. Consequently, resonant Andreev reflection induced by occurs in channels and always injects Cooper pairs into leads. condensate results a spin-orbit coupling (SOC) controlled oscillatory critical current...

Superconductivity and the quantum Hall effect are distinct states of matter occurring in apparently incompatible physical conditions. Recent theoretical developments suggest that coupling with a superconductor can provide fertile ground for realizing exotic topological excitations such as non-Abelian Majorana fermions or Fibonacci particles. As step toward goal, we report observation Andreev reflection at junction edge state single layer graphene quasi-two-dimensional niobium diselenide...

We report on Andreev reflections at clean $\mathrm{NbS}{\mathrm{e}}_{2}$-bilayer graphene junctions. The high transparency of the junction, which manifests as a large conductance enhancement up to 1.8, enables us see clear evidence proximity-induced superconducting gap in bilayer and two through vertical $\mathrm{NbS}{\mathrm{e}}_{2}$-graphene lateral graphene-graphene respectively. Quantum transport simulations capture complexity experimental data illuminate impact various microscopic...

Higher-order topological phases host robust boundary states at the of boundary, which can be interpreted from their topology. In this work, we show that based on surface a weak insulator, interplay between superconductors and magnetic fields lead to various helical or chiral Majorana hinge modes even corner modes. Particularly, obtained higher-order (TSCs) attributed certain boundaries, surfaces, hinges, naturally behave as TSC in DIII D symmetry class. Correspondingly, these TSCs...

Abstract “Click” chemistry‐based surface modification strategy was developed for PDMS microchips to enhance separation performance both amino acids and proteins. Alkyne‐PEG synthesized by a conventional procedure then “click” grafted azido‐PDMS. FTIR absorption attenuated total reflection contact angle measurements proved efficient grafting of alkyne‐PEG onto surface. Manifest EOF regulation stability PEG‐functionalized were illustrated via protein adsorption investigations. The nonspecific...

We uncover the transverse Majorana spin polarization of a class higher-order topological superconductors. ``Transverse'' means that zero modes is perpendicular instead parallel with applied magnetic field. With this novel property, we predict spin-selective Andreev reflection occurs at lead to field, in sharp contrast nanowire and vortex system. The induced Josephson ${\ensuremath{\phi}}_{0}$ junction shows qualitative difference from topologically trivial provides benefits constructing all...