Newly synthesized Janus transition-metal dichalcogenides MXY ($M=\mathrm{Mo}$, W; $X\ensuremath{\ne}Y=\mathrm{S}$, Se, Te) possess intrinsic Rashba spin splitting and out-of-plane dipole moment due to the breaking of mirror symmetry. Taking WSSe as an example, we present a first-principles investigation structural stability electronic properties mono-, bi-, multilayer MXY. Results show that S atoms contribute more than Se in valence-band maximum at $\mathrm{\ensuremath{\Gamma}}$ point, which...

Abstract Ferroelectricity, band topology, and superconductivity are respectively local, global, macroscopic properties of quantum materials, understanding their mutual couplings offers unique opportunities for exploring rich physics enhanced functionalities. In this mini‐review, the attempt is to highlight some latest advances in vibrant area, focusing particular on ferroelectricity‐tuned topology 2D materials related heterostructures. First, results from predictive studies delicate between...

Abstract Two‐dimensional (2D), high‐temperature, half‐metal ferromagnetic semiconductors with large spin gap and topological band structures are highly desirable for novel nanoscale spintronic applications. A family of stable 2D honeycomb‐Kagome Cr 2 X 3 (X=O,S,Se) monolayers is proposed through first‐principles calculations. Buckled O a semiconductor out‐of‐plane magnetocrystalline anisotropy energy predicted Curie temperature 332 K under moderate biaxial tensile strain. Planar S Se...

Ferroelectricity, superconductivity, and topology are three cornerstone concepts of condensed matter physics, integration any two may further fertilize exotic emergent phenomena. To date, harmonic coexistence all remains to be materialized. Here, the authors predict simultaneous tuning superconducting transition temperature band by ferroelectricity, with a heterobilayer IrTe${}_{2}$ ferroelectric In${}_{2}$Se${}_{3}$ as physically realistic example. Such reversible nonvolatile tunabilities...

Recent advances in realizing ferroelectric and superconducting two-dimensional heterobilayers provide appealing platforms for exploring the interplay between ferroelectricity superconductivity, which is not only crucial understanding mechanism but also important designing next-generation devices. Based on first-principles calculations, we demonstrate that an ${\mathrm{IrTe}}_{2}$ monolayer can be stabilized a ${\mathrm{In}}_{2}{\mathrm{Se}}_{3}$ via interlayer coupling. The transition...

Two-dimensional (2D) materials possessing intrinsic superconductivity with high transition temperature and unconventional pairing are highly desired, but their realizations few far between. Recently, ${\mathrm{W}}_{2}{\mathrm{N}}_{3}$ nanosheets down to three layers were successfully prepared [Yu et al., Adv. Mater. 30, 1805655 (2018)]. By performing solid ab initio calculations based on the anisotropic Migdal-Eliashberg theory, we predict that monolayer is an unexplored (without assistance...

Janus monolayer materials, as the thinnest materials that may possess strong Rashba spin-orbit coupling, are helpful for miniaturization of charge-spin conversion devices. Using first-principles calculations, we investigated structural stability and coupling distorted $1T\text{-phase}$ WSSe. Although W atoms rotating around Se atom dynamically unstable in stress-free state, imaginary frequency disappears by applying a small compressive strain. From perspectives macroscopic charge transfer...

To study the magnetic signature of submarines and improve performance anomaly detectors in antisubmarine warfare, generation mechanism submarine field (SMF) is first introduced. Magnetic fields produced by are classified into five major types cause state submarines. Besides, prediction model SMF at low altitude proposed. Based on surface integral method, continuation formula derived from vector potential. According to a real mockup, distribution obtained formula, data caused different...

Inspired by the unique character of semiconductor‐to‐metal transition from monolayer to trilayer antimonene, we built a monolayer–trilayer lateral heterostructure based field effect transistor (FET). Low tunneling barrier and Schottky are achieved with antimonene electrodes compared promising two‐dimensional contact material graphene metal aluminum. Device performance is calculated accurately using density functional theory (DFT) nonequilibrium Green's functions (NEGF). The on/off ratio 4.87...

Using first-principles calculations, we find Li-intercalated bilayer arsenene with AB stacking is dynamically stable, which different from pristine AA stacking. Electron-phonon coupling of the stable are dominated by low frequency vibrational modes (E″(1), [Formula: see text](1), E'(1) and acoustic modes) lead to an superconductivity T c = 8.68 K isotropical Eliashberg function. Small biaxial tensile strain (2%) can improve 11.22 due increase DOS phonon softening. By considering fully...

Abstract Tb-doped YPO4 has been synthesized by a mild and simple solution precipitation approach. pH value of synthesis significant influence on the formation crystallinity YPO4:Tb. Phase transformation occurs in annealing process. Vacuum ultraviolet (VUV) excitation is investigated possible luminescence mechanism under VUV illustrated.

Very recently, a new Ni-based antiperovskite nitride superconductor CuNNi3 has been successfully synthesized. We investigate the electronic structures, phonon dispersions, and electron–phonon interactions of isostructual ZnNNi3 by first-principles approach. By analyzing Eliashberg function we obtain superconducting transition temperature Tc 3.16 K (3.53 K), which is in good agreement with corresponding experimental 3.2 (3 K) for (ZnNNi3). They can be verified as conventional phonon-mediated...

Electrochemical strain microscopy (ESM) is a powerful tool to resolve ionic transport and electrochemical processes with nanoscale resolution. To ascertain the underlying mechanism that governs signal generation of ESM imaging, fully coupled nonlinear electrochemomechanical model based on finite element method developed applied LiMn2O4 particles. The frequency dependence response, in particular response at high frequencies used detection regime, investigated detail. performed analysis...