PdSe2/MoSe2 vertical heterojunction for self-powered photodetector with high performance

Nano Research, Journal Year: 2021, Volume and Issue: 15(3), P. 2489 - 2496

Published: Aug. 10, 2021

Language: Английский

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Engineering van der Waals Materials for Advanced Metaphotonics

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(19), P. 15204 - 15355

Published: June 24, 2022

The outstanding chemical and physical properties of 2D materials, together with their atomically thin nature, make them ideal candidates for metaphotonic device integration construction, which requires deep subwavelength light–matter interaction to achieve optical functionalities beyond conventional phenomena observed in naturally available materials. In addition intrinsic properties, the possibility further manipulate materials via or engineering dramatically enhances capability, evoking new science on interaction, leading leaped performance existing functional devices giving birth that were unattainable previously. Comprehensive understanding approaches capabilities methods, resulting property modifications novel functionalities, applications are provided this review. Through reviewing detailed progress each aspect state-of-the-art achievement, insightful analyses challenges future directions elucidated cross-disciplinary comprehensive review aim provide an overall development picture field material metaphotonics promote rapid fast emerging prosperous field.

Language: Английский

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Electron-exciton interactions in the exciton-polaron problem

Physical review. B./Physical review. B, Journal Year: 2021, Volume and Issue: 103(7)

Published: Feb. 10, 2021

Recently, it has been demonstrated that the absorption of moderately doped two-dimensional semiconductors can be described in terms exciton-polarons. In this scenario, attractive and repulsive polaron branches are formed due to interactions between a photo-excited exciton Fermi sea excess charge carriers. These have previously treated phenomenological manner. Here, we present microscopic derivation electron-exciton which utilizes mixture variational perturbative approaches. We find feature classical charge-dipole behaviour long-range limit they only weakly modified for moderate doping. apply our theory properties show dependence on doping is well captured by model with contact potential.

Language: Английский

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Moiré superlattices and related moiré excitons in twisted van der Waals heterostructures

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(11), P. 6401 - 6422

Published: Jan. 1, 2021

Recent advances in moiré superlattices and excitons, such as quantum emission arrays, low-energy flat bands, Mott insulators, have rapidly attracted attention the fields of optoelectronics, materials, energy research. The interlayer twist turns into a degree freedom that alters properties systems realization excitons also offers feasibility making artificial exciton crystals. Moreover, exhibit many exciting under regulation various external conditions, including spatial polarisation, alternating dipolar to moments gate-dependence gate voltage dependence; all are pertinent their applications nano-photonics information. But lag theoretical development low-efficiency processing technologies significantly limit potential superlattice applications. In this review, we systematically summarise discuss recent progress analyze current challenges, put forward relevant recommendations. There is no doubt further research will lead breakthroughs application promote reforms innovations traditional solid-state physics materials science.

Language: Английский

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Strain-engineered topological phase transitions in ferrovalley 2H−RuCl2 monolayer

Physical review. B./Physical review. B, Journal Year: 2022, Volume and Issue: 105(19)

Published: May 31, 2022

Ferrovalley and topology are two basic concepts in both fundamental research fields emerging device applications. So far, reports extremely scarce regarding the coupling of these scenarios a single material system. By first-principles calculations Monte Carlo simulations, we predict highly stable intrinsic ferrovalley $2H\text{\ensuremath{-}}{\mathrm{RuCl}}_{\text{2}}$ semiconductor with an easy out-of-plane magnetization high Curie temperature 260 K. Due to combination exchange interaction spin-orbit coupling, system exhibits spontaneous valley polarization 240 meV top valence band, which is further confirmed by first-order perturbation theory. Moreover, its ferromagnetic ordering can remain rather robust survive up 547 K under $\ensuremath{-}5$% compressive strain well above room temperature. On other hand, application tensile drive from phase into half-valley-metal state 100% spin polarizations, followed then quantum anomalous Hall (QAH) support high-temperature QAH effect. Beyond around 2% strain, switched in-plane magnetization. If steered direction through overcoming magnetic anisotropy energy barriers, transitioned another rise finally restores initial phase. Once synthesized, monolayer would find many important applications spintronic, valleytronic, topological electronic nanodevices.

Language: Английский

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Penta-MS₂ (M = Mn, Ni, Cu/Ag and Zn/Cd) monolayers with negative Poisson's ratios and tunable bandgaps as water-splitting photocatalysts

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(11), P. 6993 - 7004

Published: Jan. 1, 2021

Seeking novel materials with specific applications is always an attractive theme in developing two-dimensional (2D) materials. Here 10 2D pentagonal transition metal dichalcogenids are identified high stability and their promising applications.

Language: Английский

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Parametric Nonlinear Optics with Layered Materials and Related Heterostructures

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 16(9)

Published: June 30, 2022

Abstract Nonlinear optics is of crucial importance in several fields science and technology with applications frequency conversion, entangled‐photon generation, self‐referencing combs, crystal characterization, sensing, ultra‐short light pulse generation characterization. In recent years, layered materials related heterostructures have attracted huge attention this field, due to their nonlinear optical susceptibilities, ease integration on photonic platforms, 2D nature which relaxes the phase‐matching constraints thus offers a practically unlimited bandwidth for parametric processes. review most advances highlighting impact both fundamental technological aspects, are reported explained, an outlook future research directions atomically thin provided.

Language: Английский

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Valleytronics in two-dimensional materials with line defect

Nanotechnology, Journal Year: 2022, Volume and Issue: 33(21), P. 212001 - 212001

Published: Feb. 2, 2022

Abstract The concept of valley originates from two degenerate but nonequivalent energy bands at the local minimum in conduction band or maximum valence band. Manipulating states for information storage and processing develops a brand-new electronics—valleytronics. Broken inversion symmetry is necessary condition to produce pure currents. polycrystalline two-dimensional materials (graphene, silicene, monolayer group-VI transition metal dichalcogenides, etc) with pristine grains stitched together by disordered grain boundaries (GBs) are natural inversion-symmetry-broken systems candidates field valleytronics. Different their forms, Dirac valleys on both sides GBs mismatched momentum space induce peculiar transport properties across GBs. In this review, we systematically demonstrate fundamental degree freedom mostly studied experimentally feasible structure—the line defect, manipulation strategies electrical, magnetic mechanical methods realize polarization. We also introduce an effective numerical method, non-equilibrium Green’s function technique, tackle issues defect systems. present challenges perspective further investigations valleytronics summarized.

Language: Английский

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A review on recent advances of chemical vapor deposition technique for monolayer transition metal dichalcogenides (MX2: Mo, W; S, Se, Te)

Materials Science in Semiconductor Processing, Journal Year: 2022, Volume and Issue: 148, P. 106829 - 106829

Published: May 30, 2022

Language: Английский

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Spontaneous valley polarization and valley-nonequilibrium quantum anomalous Hall effect in Janus monolayer ScBrI

Nanoscale, Journal Year: 2023, Volume and Issue: 15(18), P. 8395 - 8405

Published: Jan. 1, 2023

Topology and ferrovalley (FV) are two essential concepts in emerging device applications the fundamental research field. To date, relevant reports extremely rare about coupling of FV topology a single system. By Monte Carlo (MC) simulations first-principles calculations, stable intrinsic ScBrI semiconductor with high Curie temperature (TC) is predicted. Because combination spin-orbital (SOC) exchange interaction, Janus monolayer shows spontaneous valley polarization 90 meV, which located top valence band. For magnetization direction perpendicular to plane, changes from half-valley-metal (HVM), valley-nonequilibrium quantum anomalous Hall effect (VQAHE), HVM, can be induced by strain engineering. It worth noting that there no particular VQAHE states for in-plane (IP) magnetic anisotropy. obtaining real anisotropy energy (MAE) under different strains, due polarization, out-of-plane (OOP) anisotropy, chiral edge state, unit Chern number, reliably appear between HVM states. The increasing strains induce VQAHE, clarified band inversion dx2-y2/dxy dz2 orbitals, sign-reversible Berry curvature. Once synthesized, would find more significant topological electronic, valleytronic, spintronic nanodevices.

Language: Английский

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