Abstract Strain engineering is a promising method to manipulate the electronic and optical properties of two-dimensional (2D) materials. However, with weak van der Waals interaction, severe slippage between 2D material substrate could dominate bending or stretching processes, leading inefficiency strain transfer. To overcome this limitation, we report simple by encapsulating monolayer in flexible PVA through spin-coating approach. The strong interaction force spin-coated ensures mechanical...

Abstract Thermal conductivity is one of the most fundamental properties solid materials. The thermal ideal crystal materials has been widely studied over past hundreds years. On contrary, for amorphous that have valuable applications in flexible electronics, wearable electrics, artificial intelligence chips, protection, advanced detectors, thermoelectrics, and other fields, their are relatively rarely reported. Moreover, recent research indicates quite different from In this article, authors...

Abstract There is an emergent demand for high-flexibility, high-sensitivity and low-power strain gauges capable of sensing small deformations vibrations in extreme conditions. Enhancing the gauge factor remains one greatest challenges sensors. This typically limited to below 300 set when sensor fabricated. We report a strategy tune enhance sensors based on Van der Waals materials by tuning carrier mobility concentration through interplay piezoelectric photoelectric effects. For SnS 2 we up...

Motivated by the synthesized ${\mathrm{Cu}}_{4}{\mathrm{Ti}\mathrm{Se}}_{4}$ with ultralow room-temperature thermal conductivity [Angew. Chem., Int. Ed. 60, 9106 (2021)], we systematically investigate its thermoelectric (TE) properties via combining Boltzmann transport equations and first-principles calculations. The results show that of determined considering only three-phonon scattering is reduced about 40% after including four-phonon at room temperature, indicating importance in phonon...

Spin-momentum coupling, which depends strongly on the relativistic effect of heavy elements in solids, is basis many phenomena spintronics. In this Letter, we theoretically predict nonrelativistic spin-momentum coupling two-dimensional materials. By proposing magnetic symmetry requirements for spin splitting systems, find that a simple twisting operation can realize antiferromagnetic bilayers. Through first-principles calculations, demonstrate momentum-dependent exists extensively twisted...

Abstract Topological phononics, a fascinating frontier in condensed matter physics, holds great promise for advancing energy‐related applications. Topologically nontrivial phonons typically possess gapless edge or surface states. These exotic states of lattice vibrations, characterized by their topology, offer unique opportunities manipulating and harnessing energy transport. The exploration topological opens new avenues understanding controlling thermal transport properties, with potential...

Education (EDU) enhances life expectancy (LEF) by improving health literacy and access to healthcare, leading healthier lifestyles. Urbanization (URB) fosters better healthcare infrastructure essential services, although it must be managed avoid negative environmental impacts. Green growth (GG) ensures sustainable development, reduces pollution risks, contributes longer, lives. Therefore, this study examines the impact of EDU, URB GG on LEF in China from 1990 2022. This utilizes unit root,...

Single-crystalline submicrometer-sized ribbons of copper phthalocyanine (CuPc) have been synthesized (see Figure). Organic field-effect transistors (OFETs) fabricated using individual CuPc exhibit high mobilities and low threshold voltages. These characteristics are highly reproducible stable, indicating the quality transistors. Moreover, show excellent flexibility, which may lead to their application in flexible electronics. Supporting information for this article is available on WWW under...

By using nonequilibrium Green's functions in combination with the density functional theory, we investigate electronic transport properties of edge hydrogenated zigzag-edged graphene nanoribbon heterojunctions. Results show that a perfect spin-filtering effect 100% spin polarization and rectifying behavior ratio larger than 105 can be realized by dihydrogenation, which also modulated changing widths two component ribbons.

The electronic transport properties in phenalenyl molecular device are studied by using nonequilibrium Green’s functions combination with the density-functional theory. results show that strongly dependent on contact geometry. negative differential resistance behavior large peak to valley ratio is observed when molecule contacts Au electrodes through two second-nearest sites or one site and third-nearest site, while rectifying performance only site. mechanisms proposed for these phenomena.

A hybridized structure constructed by zigzag boron nitride nanoribbon and graphene is proposed, their band structures electronic transport properties are calculated applying first-principles calculations. The results show that the gap of can be tuned transitions from insulator to metal realized changing unit number nanoribbon. currents with different spin polarization display behavior.

Abstract The demands for waste heat energy recovery from industrial production, solar energy, and electronic devices have resulted in increasing attention being focused on thermoelectric materials. Over the past two decades, significant progress is achieved inorganic In addition, with proliferation of wireless mobile devices, economical, efficient, lightweight, bio‐friendly organic (OTE) materials gradually become promising candidates used room‐temperature environments. With development...

The diversity of thermal transport properties in carbon nanomaterials enables them to be used different fields such as heat dissipation, management, and thermoelectric conversion. In the past two decades, much effort has been devoted study conductivities nanomaterials. this review, theoretical methods experimental techniques for investigating nanosystems are first summarized. Then, various pure including 1D nanotubes, 2D graphene, 3D foam, reviewed details associated underlying physical...

The thermal transport properties of the graphene and boron nitride superlattice (CBNSL) are investigated via nonequilibrium molecular dynamics simulations. simulation results show that a minimum lattice conductivity can be achieved by changing period length superlattice. Additionally, it is found at shifts to lower values higher temperatures, depth increases with decreasing temperature. In particular, 200 K, conductivities CBNSLs certain specific lengths nearly equal corresponding 300 K. A...

Thermally driven magnetic-molecular junctions can be designed as pure spin current generators, thermoelectric devices or thermal-spin converters.

Abstract By using first-principles calculations combined with the phonon Boltzmann transport equation, we systematically investigate of monolayer WSe2. Compared other 2D materials, WSe2 is found to have an ultralow thermal conductivity due Debye frequency and heavy atom mass. The room temperature for a typical sample size 1 μm 3.935 W/m K, which one order magnitude lower than that MoS 2 . And can be further decreased by about 95% in 10 nm sized samples. Moreover, also find ZA phonons...

The linear dichroism (LD) transition within anisotropic photonic materials displays promising prospects for applications in polarization-wavelength-selective detectors, optical switching, and communication. In conventional two-dimensional (2D) materials, the LD is predominantly uniaxial over a broad spectrum of wavelengths arises principally from reduced symmetry materials. However, behavior crystalline 2D remains elusive. Here, we demonstrate observation unique conversion phenomenon at...

By using density functional theory and ab initio quantum-transport simulation, we study the Schottky barrier rectifying behavior of diodes consisting two-dimensional metal phase $1T\text{\ensuremath{-}}{\mathrm{MoS}}_{2}$ semiconductor 2H-${\mathrm{MoS}}_{2}$. The results show that out-of-plane (OP) contacted ${\mathrm{MoS}}_{2}$ heterostructure diode is a little different from in-plane (IP) diode. current-voltage characteristics OP has better compared to IP under zero gate voltage....

Using a scanning tunneling microscope, we measured high-bias conductance of single polyporphyrin molecular wires with lengths from 1.3 to 13 nm. We observed several remarkable transport characteristics, including multiple sharp peaks, conductances as high 20 nS in >10 nm, and nearly length-independent (attenuation <0.001 Å–1). carried out first-principles simulations on myriad metal–molecule–metal junctions. The revealed that the is coherent resonant via delocalized orbital.

Using first-principles calculation and Boltzmann electron/phonon transport theory, we present an accurate theoretical prediction of thermoelectric properties the α-Ag2S crystal, a ductile inorganic semiconductor reported experimentally [Nat. Mater. 2018,17, 421]. The has ultralow thermal conductivity associated with high anisotropy, which can be attributed to complex crystalline structure weak bonding. optimal values Seebeck coefficient are 0.27 × 10-3 V/K for n-type 0.21 p-type α-Ag2S,...

Magnon-phonon scattering (MPS) has attracted widespread attention in quantum heat/spin transport across the ferromagnetic/nonmagnetic (F/N) interfaces, with rapid progress of experiments on spin caloritronics recent years. However, lack theoretical methods, accounting for MPS rigorously, seriously hindered investigations heat magnetic nanostructures broken translational symmetry, such as F/N interfaces. In this paper, we propose a formalism nonequilibrium Green function to incorporate into...

Self-trapped excitons (STEs) have recently been observed in several metal halide perovskites (MHPs), especially low-dimensional ones. Despite studies that shown factors like dopant, chemical composition, lattice distortion, and structural electronic dimensionality may all affect the self-trapping of excitons, a general understanding their mechanism formation MHPs is lacking. Here, we study intrinsic defect-induced three-, two-, one-dimensional MHPs. We find whether free could be trapped...

Motivated by the recent experiment demonstration of stacking dependent interlayer magnetic interaction [T. Song et al., Nat. Mater. 18, 1298 (2019); T. Li 1303 W. Chen Science 366, 983 (2019)], we investigate magnetization textures and control possibilities in moir\'{e} pattern formed twisted bilayer two-dimensional (2D) magnets CrX$_3$ (X=Br, I). We find that results formation periodic domains a long-period pattern. Magnetization with various topological numbers can be constructed,...