We report a first-principles theoretical approach for analyzing linear and circular photogalvanic effects (PGEs) based on density functional theory within the nonequilibrium Green's function formalism. Using this we investigate PGE phenomena in monolayer black phosphorus (MBP) doped with sulfur atoms. The impurity doping breaks space inversion symmetry of pristine MBP, leading to Cs mirror reflection plane normal zigzag direction MBP lattice. Governed by symmetry, is induced both armchair...

Ferroelectric tunnel junctions (FTJs) have been intensively studied in recent years due to the great potential nonvolatile memory devices and two-dimensional (2D) FTJs started catch attention lately because of their atomic thickness significance miniaturizing FTJ device sizes. In this work, we propose a mechanism for building 2D based on large difference between two work functions ferroelectric polar material with out-of-plane polarization. When it forms van der Waals (vdW) vertical...

Two-dimensional (2D) ferroelectric materials have attracted great attention in recent years due to their thin thickness, high stability, and switchable polarization states. In particular, tunnel junctions (FTJs) constructed from 2D been shown very electroresistance (TER) ratios. this work, we design a junction composed of ${\mathrm{Sc}}_{2}{\mathrm{CO}}_{2}/{\mathrm{In}}_{2}{\mathrm{Se}}_{3}$ vertical van der Waals (vdW) heterostructure based on two different with out-of-plane polarization....

The interplay between the spin-orbit interaction (SOI) and magnetism produces interesting phenomena in superconductors. When a two-dimensional (2D) system with strong SOI is coupled to an $s$-wave superconductor, in-plane magnetic field can drive into gapless superconducting state induce mirage gap at finite energies for Ising superconductor. In this Letter, we demonstrate that when superconductor proximitized altermagnet, intrinsic anisotropic spin splitting of altermagnet result pair gaps...

We propose a new idea to generate pure spin current with photogalvanic effect (PGE) by designing devices spatial inversion symmetry based on two-dimensional semiconducting materials. Due the preservation of symmetry, electric generated PGE must be zero. However, finite spin-dependent ${I}_{\ensuremath{\uparrow}/\ensuremath{\downarrow}}$ may still produced. Once an amount spin-up electrons flow into device region from lead $\ensuremath{\alpha}$ and out $\ensuremath{\beta}$ under light...

Recently, the exciting reentrant localization transition phenomenon was found in a one-dimensional dimerized lattice with staggered quasiperiodic potentials. Usually, long-range hopping is typically important actual physical systems. In this work, we study effect of next-nearest neighbor (NNNH) on phenomenon. Due to presence NNNH, broken chiral symmetry further enhanced and properties electron states upper lower bands become quite different. It that can still persist within range NNNH both...

Using nonequilibrium Green's function combined with density functional theory, we investigate the spin-related current generated by photogalvanic effect (PGE) in monolayer zigzag SiC nanoribbons (ZSiCNRs) first-principles calculations. Due to its unique atomic structure and band properties, find that 100% spin polarized photocurrent can be easily obtained a wide range of photon energies shining linearly/circularly light when ZSiCNRs are anti-ferromagnetic (AFM) state. In comparison,...

A new scheme for generating perfect spin-polarized quantum transport in zigzag-edged graphene nanoribbons is demonstrated by light irradiation on a <italic>h</italic>-BN/graphene/<italic>h</italic>-BN van der Waals (vdW) heterostructure.

Giant tunneling electroresistance is realized through the construction of an all two-dimensional ferroelectric tunnel junction with 2D materials BiP and B/N-doped graphene.

The photogalvanic effect (PGE) occurring in noncentrosymmetric materials enables the generation of an open-circuit voltage that is much larger than bandgap, making it rather attractive solar cells. However, magnitude PGE photocurrent usually small, which severely hampers its practical application. Here we propose a mechanism to largely enhance by mechanical strain based on quantum transport simulations for two-dimensional nickel-phosphorene-nickel photodetector. A broadband governed...

Two-dimensional (2D) ferroelectric materials (FEMs) and their application in tunnel junctions (FTJs) have attracted a great deal of attention during the past several years due to potential nonvolatile memory devices. Particularly, all-2D FTJs, which only atomic-layer thickness, been demonstrated show very high electroresistance (TER) ratio. Nevertheless, better integrate with present semiconductor technology, it is necessary consider metal contacts construction FTJs 2D FEMs. However, unknown...

Abstract Interacting with an evanescent wave, achiral particle can experience a lateral optical force (LOF) in direction which is perpendicular to that of the illuminating photon momentum while system apparently has left–right symmetry. Here, using Cartesian multipole expansion theory, general relationship between LOF and spin established. Most importantly, it demonstrated anomalous exerted on isotropic arbitrary size composition proportional transverse incident wave carries pure associated...

We present the new concept of photonic alloy as a non-periodic topological material. By mixing non-magnetized and magnetized rods in 2D crystal configuration, we realized alloys microwave regime. Our experimental findings reveal that sustains non-reciprocal chiral edge states (CESs) even at very low concentration rods. The non-trivial topology associated these systems can be characterized by winding reflection phase. results indicate threshold concentrations for investigated system within...

Zigzag graphene nanoribbon (ZGNR) is highly promising low-dimensional spintronic materials due to their unique magnetic edge structure. However, the generation of bipolar fully spin-polarized photocurrent through a ZGNR design has...

Abstract Living organisms with diverse perceptual functions interact their environment through ion activity, a feature that bestows them integrated processing, parallel operations, and efficient energy utilization. Inspired by this, an ionic hydrogel device is presented seamlessly integrates multimodal sensing synaptic properties, creating simplified architecture for self‐powered tactile‐visual fusion perception. The precise control of transport piezoionic thermodiffusion effects in the...

Quantum transport and spin current in a zigzag SiC nanoribbon device under thermal gradient are investigated theoretically within the framework of Landauer–Buttiker formalism using first-principles technique. It is found that edge state channels can be turned off or kept open by specific doping, different controlled separately. Interestingly, replacing an C atom with B Si P scattering region, Seebeck thermopower signs for spins finite conductance both obtained linear response regime. The...

We propose and theoretically investigate an idea of valley caloritronics where quantum transport the degrees freedom is thermally induced. Valley addresses questions such as thermal generation polarized current and, more importantly, pure without accompanying charge current. After establishing a general physical picture, we show that heat-induced can be generated by virtue wedge-shaped graphene nanoribbons in two-probe device setup. discover properties degree very different when driven...

The robust transport of edge modes is perhaps the most useful property topological materials. existence guaranteed by bulk-edge correspondence, which states that number determined bulk invariants. To obtain on edge, we need to make volumetric changes many atoms control properties a few in lower dimension. We suggest here can do reverse some cases: guarantee chiral phenomena modes, achieving are essentially same as those observed valley-Hall systems. Specifically, show topologically trivial...

The topological phase in amorphous systems adds a new dimension to the states of matter. Here, we present an interesting phenomenon dubbed Anderson insulator (TAAI). disorder can drive topologically trivial with structural disorders into noncrystalline insulators. gap closing and reopening, spin Bott index, robust edge states, quantized conductance characterize disorder-induced nontrivial topology systems. More importantly, diagrams are given for transition (TPT). It is found that...

The edge magnetism of zigzag SiC nanoribbons in its ground state is half-metallic, but competed by a non-half-metal that energetically extremely close. In this work, we propose and theoretically analyze two-probe transport junctions overcome difficulty so perfect half-metal quantum realized. When two are connected C–Si–C–Si tetramer where the right ribbon turned 180° around direction, 100% spin polarization with nearly transmission obtained due to momentum k-matching across junction. We show...

We theoretically investigate the localization mechanism of quantum anomalous Hall effect (QAHE) in presence spin-flip disorders. show that QAHE stays quantized at weak disorders, then enters a Berry-curvature mediated metallic phase moderate and finally goes into Anderson insulating strong From diagram, we find charge neutrality point although is most robust against corresponding much easier to be localized due interchange Berry curvatures carried, respectively, by conduction valence bands....