A5049661354- 2D Materials and Applications
- Orbital Angular Momentum in Optics
- Near-Field Optical Microscopy
- Graphene research and applications
- Perovskite Materials and Applications
- MXene and MAX Phase Materials
- Plasmonic and Surface Plasmon Research
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- ZnO doping and properties
- Digital Holography and Microscopy
- Advanced Sensor and Energy Harvesting Materials
- Photocathodes and Microchannel Plates
- Superconductivity in MgB2 and Alloys
- Physics of Superconductivity and Magnetism
- Additive Manufacturing Materials and Processes
- Ga2O3 and related materials
- Microfluidic and Bio-sensing Technologies
- Quantum Dots Synthesis And Properties
- Welding Techniques and Residual Stresses
- Advanced Condensed Matter Physics
- Laser-Matter Interactions and Applications
- Gas Sensing Nanomaterials and Sensors
- Chalcogenide Semiconductor Thin Films
- Nanowire Synthesis and Applications
Chemnitz University of Technology
2021-2024
Nanjing Normal University
2021-2023
Hebei University
2023
Rice University
2022
Superconducting and other Innovative Materials and Devices Institute
2022
University of Genoa
2022
Southeast University
2013-2019
Highly photoluminescent all-inorganic copper based perovskite Cs2CuX4 (X = Cl, Br, and Br/I) quantum dots (QDs) were facilely synthesized investigated for the first time. These QDs exhibited high yield blue-green light excellent stability, while particle size photoluminescence wavelength could be tuned via molar ratio of raw materials.
Abstract The low carrier injection efficiency and the droop at high current have seriously affected optoelectronic performance of AlGaN-based deep ultraviolet LEDs. In this work, we propose deep-UV LED incorporating p -Al 0.6 Ga 0.4 N/ -GaN superlattice with thin wells (1 nm) as hole layer to improve device. Theoretical simulations show an enhancement concentration in quantum wells, which increased by one order magnitude designed -type structure due induced strong polarization field....
Flexible temperature sensors are becoming increasingly important these days. In this work, we explore graphene oxide (GO)/poly(vinyl alcohol) (PVA) nanocomposites for potential application in sensors. The influence of the mixing ratio both materials, reduction temperature, and passivation on sensing performance has been investigated. Various spectroscopic techniques revealed composite structure atomic composition. These were complemented by semiempirical quantum chemical calculations to...
Vertical stacking of two-dimensional (2D) homo- and heterostructures are intriguing research objects, as they essential for fundamental studies a key towards 2D device applications. It is paramount to understand the interlayer coupling in materials find fast yet precise characteristic signature. In this work, we report on Raman fingerprint transition metal dichalcogenides (TMDCs). We observed that out-of-plane B2g vibrational mode absent when two monolayers form vertical stack remain...
Abstract Twisted 2D bilayer materials are created by artificial stacking of two monolayer crystal networks with a desired twisting angle θ . The material forms moiré superlattice due to the periodicity both top and bottom layer structure. optical properties modified lattice reconstruction phonon renormalization, which makes spectroscopy an ideal characterization tool study novel physics phenomena. Here, we report Raman investigation on full period twisted (tB) WSe 2 (i.e. 0 <mml:math...
Breaking down the traditional perception on phonons which are achiral, existence of a chiral phonon carrying angular momentum provides possible ways to couple electrons, photons, spins, magnons, and excitons, etc. We theoretically proposed an electron-chiral interaction with two-phonon process, in contrast conventional electron-phonon interaction, kind effective Hubbard through exchanging two is proposed. Taking two-dimensional diatomic honeycomb lattice as example, we found this repulsive...
The electromagnetic field confinement and amplification typical of nano-sized metallic objects supporting localized surface plasmon resonances, i.e., light-induced collective electronic oscillations, can significantly strengthen the interaction light with atomically thin transition metal dichalcogenides. In view realization plasmon-enhanced devices, it is crucial to investigate effects induced by within nanostructures on excitonic properties these materials at nanoscale. Here, we exploit...
We report large exciton energy tuning (∼62 meV) in WSe 2 monolayers via substrate induced non-degenerate electron doping.
As a potential degree of freedom, the chirality phonons is expected to become carrier information. Exploring phonon mode that can stably maintain along certain transport path basis for its realization. In this work, we find chiral interface obviously localized at line defect in hexagonal boron nitride intralayer heterojunction, which topologically protected. The existence mirror symmetry results having opposite chiralities on both sides interface. For B-B and N-N configurations, heavy-atom...
Abstract The presence of strong spin–orbit coupling in the valence band and weak spin‐splitting conduction result lowest energy exciton WX 2 (X = S, Se) being spin forbidden optically dark. Because their long lifetimes, dark excitons are highly attractive for quantum optics optoelectronic applications. To date, studying excitonic emissions is limited to cryogenic temperatures or requires very complex experimental configurations observe them at room temperature (RT). Here, radiative decay...
We propose and generate a new radial-variant vector field (RV-VF) with distribution of states polarization described by the square radius exploit its focusing property. Theoretically, we present analytical expressions for three-dimensional electric focused thin lens under nonparaxial paraxial approximations based on vectorial Rayleigh-Sommerfeld formulas. Numerical simulations indicate that this exhibits bifocusing spots along optical axis. The underlying mechanism generating property is...
We present and demonstrate a novel method for engineering the radial-variant polarization on incident field to achieve needle of transversally polarized without any pupil filters. generate new kind localized linearly-polarized vector fields with distributions states (SoPs) describing by radius power p explore its tight focusing, nonparaxial paraxial focusing properties. By tuning p, we obtain needle-like focal hybrid SoPs give formula length needle. Experimentally, systematically investigate...
Hexagonal boron nitride (hBN), sometimes referred to as white graphene, receives growing interest in the scientific community, especially when combined into van der Waals (vdW) homo- and heterostacks, which novel interesting phenomena may arise. hBN is also commonly used combination with two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDCs). The realization of hBN-encapsulated TMDC heterostacks can indeed offer opportunities investigate compare excitonic properties...
We theoretically and experimentally investigate the focusing properties of asymmetric-sector-shaped vector beams with localized linear polarization. Simulation results show that shape-only modulation beam allows one to simultaneously change intensity, phase, polarization, as well spin angular momentum distributions focused field. Experimentally, we generate study its intensity polarization characteristics at focal plane, which are in good agreements numerical simulations. The presented...
Nonzero mean value of phonon angular momentum (PAM) in chiral materials can be generated when a temperature gradient is applied. We find that both diagonal and off-diagonal terms PAM contribute to by using the Kubo formula where elements heat current operator are considered. The calculation results show term dominant scattering strong enough. This finding reveals quantum transition between different modes induced strongly affects local atomic rotation. Our discovery provides an explanation...
Based on the vectorial Rayleigh-Sommerfeld integrals, analytical expressions for azimuthal-variant vector fields diffracted by an annular aperture are presented. This helps us to investigate propagation behaviors and focusing properties of apertured under nonparaxial paraxial approximations. The diffraction a circular aperture, disk, or in free space can be treated as special cases this general result. Simulation results show that transverse intensity, longitudinal far-field divergence angle...
This study describes the fabrication of hybrid two-dimensional (2D)-quantum dot (QD) MoS2-AgInS2 photoconductive devices through mechanical pressing a MoS2 flake onto an AgInS2 QD film. The exhibit enhanced photoresponse at both continuous and modulated optical excitations, compared with bare or layer, due to formation built-in electric field near MoS2/AgInS2 interface. wave is significantly higher effective gain when electrons flow freely flake, whereas holes are effectively trapped in QDs....
Owing to the extraordinary physical and chemical properties, potential couple with nanoplasmonic structures, two-dimensional (2D) transition metal dichalcogenides are promising materials for next-generation (opto-)electronic devices. Targeting application stage, it is essential understand mechanisms of photoluminescence (PL) quenching enhancement at nanoscale. In this work, using monolayer MoSe2/hBN heterostructure on Au nanotriangles (NTs) as an example, we report local PL in quantum...
Laser cladding is so complex that small disturbances may cause defects. Developing on-line monitoring technology for laser thus a priority task. Compared with expensive spectrometers and high-speed cameras, an economical optical sensing system based on two different photodiodes was established to optimize parameters help monitor abnormal working conditions. In order find optimal parameters, series of experiments carried out under operating such as power, scanning speed, powder feeding rate....