A5101443903- 2D Materials and Applications
- Perovskite Materials and Applications
- Spectroscopy and Quantum Chemical Studies
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- MXene and MAX Phase Materials
- Graphene research and applications
- Semiconductor Quantum Structures and Devices
- Quantum and electron transport phenomena
- Magnesium Alloys: Properties and Applications
- Advanced Thermoelectric Materials and Devices
- Robot Manipulation and Learning
- Organic Electronics and Photovoltaics
- Teleoperation and Haptic Systems
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Photochromic and Fluorescence Chemistry
- Digital Radiography and Breast Imaging
- Industrial Automation and Control Systems
- Strong Light-Matter Interactions
- Soft Robotics and Applications
- Advanced Sensor and Control Systems
- Laser-induced spectroscopy and plasma
- Physics of Superconductivity and Magnetism
Shanghai University
2023-2025
Purdue University West Lafayette
2025
Hangzhou Normal University
2025
Beijing Institute of Petrochemical Technology
2022-2024
China Academy of Engineering Physics
2021
Chinese Academy of Sciences
2013-2019
Institute of Semiconductors
2013-2019
University of Hong Kong
2017-2019
Shenyang Institute of Automation
2018
Shanghai Advanced Research Institute
2016
In order to increase the response speed of InSe‐based photodetector with high photoresponsivity, graphene is used as transparent electrodes modify difference work function between and InSe. As expected, InSe/graphene photodetectors down 120 μs, which about 40 times faster than that an InSe/metal device. It can also be tuned by back‐gate voltage from 310 μs 100 μs. With speed, photoresponsivity reach 60 A W −1 simultaneously. Meanwhile possess a broad spectral range at 400–1000 nm. The design...
In this work, comprehensive temperature and excitation power dependent photoluminescence time-resolved studies are carried out on monolayer WSe2 to reveal its properties of exciton emissions related excitonic dynamics. Competitions between the localized delocalized emissions, as well trion observed, respectively. These competitions suggested be responsible for abnormal intensity properties. The radiative lifetimes both excitons trions exhibit linear dependence within regime below 260 K,...
Abstract A critical challenge for the integration of optoelectronics is that photodetectors have relatively poor sensitivities at nanometer scale. Generally, a large electrodes spacing in required to absorb sufficient light maintain high photoresponsivity and reduce dark current. However, this will limit optoelectronic density. Through spatially resolved photocurrent investigation, we find metal-semiconductor-metal (MSM) based on layered GaSe mainly generated from region close metal-GaSe...
Abstract We have systematically examined the circular polarization of monolayer WSe2 at different temperature, excitation energy and exciton density. The valley depolarization in is experimentally confirmed to be governed by intervalley electron-hole exchange interaction. More importantly, a non-monotonic dependence on power density has been observed, providing experimental evidence for scattering rate excited physical origination our observations proposed analogy D′yakonov-Perel′ mechanism...
Monolayer transition metal dichalcogenids (TMDs) feature valley degree of freedom, giant spin-orbit coupling and spin-valley locking. These exotic natures stimulate efforts exploring the potential applications in conceptual spintronics, valleytronics quantum computing. Among all directions, a long lifetime spin and/or polarization is critical. The present dynamics studies concentrate on band edge excitons which predominates optical response due to enhanced Coulomb interaction two dimensions....
Optical excitation could generate electrons' spin polarization in some semiconductors with the control of field polarization. In this article, we report a series spin-resolved photocurrent experiments on monolayer tungsten disulfide. The demonstrate that optical excitations same helicity opposite around Fermi level by tuning energy. mechanism lies valley-dependent selection rules, giant spin-orbit coupling, and spin-valley locking transition metal dichalcogenides (TMDs). These exotic...
Excitons in monolayer transition metal dichalcogenides (TMDs) provide a paradigm of composite Boson two-dimensional system. This Letter reports photoluminescence and reflectance study excitons molybdenum diselenide (MoSe2) with electrostatic gating. We observe the repulsive attractive Fermi polaron modes band edge exciton, its excited state, spin-off excitons, which simple three-particle trion model is insufficient to explain. The contrasting energy shift between exciton charge-bound...
The dangerous work situation in industrial leakage accidents urgently needs a flexible and small robot to help workers perform operations protect them from being injured. An aerial manipulator system consisting of hexa-rotor UAV one-DOF is developed, used press an emergency switch shut off machinery emergency. In practical application, usually performs contact as the platform hover flight. hovering acting spring-mass-damper firstly proved. Then, based on derived model impedance control...
The exciton valley dynamics in monolayer WSe<sub>2</sub> is investigated by the two-color pump–probe magneto-optical Kerr technique.
Natural channel proteins (NCPs) have numerous ion transport modes, but it remains a big challenge to replicate this trait by artificial systems. Herein, we present an azobenzene-incorporated single-chain random heteropolymers (RHPs)-derived biomimetic K+ P3, which can switch between three states ("ON," "Partially OFF," and "Totally OFF") in both liposomes cancer cells. The conformational adjustments of P3 activated light-modulating two groups supramolecular interactions ((1) hydrogen bonding...
Abstract Conjugated polymers (CPs) show great potential for pressure detection due to the amorphous polymer packing, but a lack of clarity regarding sensing mechanisms hampers development further applications. Herein, sacrificial template‐full solution method with both rough surface and high conductivity is described that can be applied sandwich‐structured resistive sensors. Transient absorption measurements demonstrate significant increase carrier lifetime (from 1.44 2.54 ns) induced by...
Natural channel proteins (NCPs) enable efficient and selective transport of specific species across cellular membranes exhibit stimulus‐responsive behaviors; however, replicating these features in their artificial counterparts poses significant challenges. Here we report a hyperbranched polymer (HBP)‐derived biomimetic multipath proton system, H3, by straightforward “one‐pot” cationic polymerization 3‐ethyl‐3‐(hydroxymethyl)‐oxetane. H3 efficiently transports protons while rejecting other...
Efficient and long-range exciton transport is critical for photosynthesis opto-electronic devices, triplet-harvesting materials, triplet diffusion length ( LD ) coefficient D are key parameters in determining their performances. Herein, we observed that PtII PdII organometallic nanowires exhibit anisotropic of 5-7 μm along the M-M direction using direct photoluminescence (PL) imaging technique by low-power continuous wave (CW) laser excitation. At room temperature, via a combined...
Bi2S3 single-crystalline nanowires are synthesized through a hydrothermal method and then fabricated into single nanowire photodetectors. Due to the different contact barrier between gold electrode nanowires, two kinds of devices with electrical contacts obtained their photoresponsive properties investigated. The non-ohmic show larger photocurrent gains shorter response times than those ohmic devices. Furthermore, influence focused laser on height is explored in both shows that illumination...
Excitons in two-dimensional (2D) semiconductors are particularly exciting, as reduced screening and dimensional confinement foster their pronounced many-body interactions. Optical pumping is typically used to create excitons so study properties, but at the same time such can also unbound charge carriers. This makes experimental determination of exciton-exciton interactions difficult. Most importantly, two effects band gap renormalization Coulomb on individual exciton resonance energy...
The antibacterial properties and corrosion resistance of magnesium-based materials are critical to the safety reliability medical equipment. As a promising metallic biomaterial for such applications, must address significant concerns regarding potential various components bacterial contamination in operating rooms other environments. Ensuring that equipment remains safe dependable is paramount, as these issues can compromise effectiveness integrity devices. This study evaluated synergistic...
A 40l/h Helium Liquefier has been commissioned by the Technical Institute of Physics and Chemistry, Chinese Academy Sciences. measurement control system based on Siemens PLC S7-300 for this is developed. Proper sensors are selected, example, three types transmitters adopted respectively according to detailed temperature requirements. CPU315-2PN/DP operates as a master station sets ET200 M DP remote expand I/O operate asslave stations. Profibus-DP field communication used between slave The...
By employing ultrafast transient reflection measurements based on two-color pump-probe spectroscopy, the population and valley polarization dynamics of trions in monolayer MoSe
In this work, we systematically investigate the linear absorption associated with excitons' interband transition of a semiconductor quantum dot (SQD) in proximity to metal nanoparticle (MNP), where competition between local field enhancement and nonradiative resonant energy transfer (NRET) plays critical role. It is shown that coefficient SQD depends strongly on geometrical parameters hybrid nanostructure. particular, continuous from quenching varying MNP size location clearly observed....
We investigated the build-up and relaxation processes of spin-polarized A- B-exciton dynamics in monolayer, bilayer, bulk WSe2 using helicity-resolved two-color pump-probe spectroscopy. Substantial spin polarization was confirmed crystals, though degree A excitons decreased from monolayer to bulk. However, almost vanished all different layered-flakes when resonantly pumping transition, owing dominant role interexciton transfer. When A-exciton up-converted B inverted layers because efficient...
We report the observation of spectral broadening induced by 200 femtosecond laser pulses with repetition rate 1 kHz at wavelength 532 nm in semi-insulating 4H–SiC single crystals. It is demonstrated that full width half maximum output spectrum increases linearly light propagation length and peak power density, reaching a 870 cm−1 on crystal 19 mm long under an incident density 60.1 GW/cm2. Such can be well explained self-phase modulation model which correlates time-dependent phase change to...
Developing from transient absorption (TA) spectroscopy, two-dimensional (2D) spectroscopy with pump-probe geometry has emerged as a versatile approach for alleviating the difficulty in implementing 2D other geometries. However, presence of cross-phase modulation (XPM) TA introduces significant spectral distortions, particularly when pump and probe pulses overlap. We demonstrate that this phenomenon is extended to XPM induced by interference two pulses. present oscillatory behavior spectrum...
Monolayer transition metal dichalcogenides (TMDs) provide 2D semiconductors with a rich interplay of electron spin and valley degrees freedom. Along strong optical coupling strength, it provides an ideal platform to study exciton-related physics in the limit. Intensive experimental approaches on exciton dynamics monolayer TMDs have been focusing lifetime exciton, valley/spin polarization, coherence, whereas 'hot' relaxation is rarely addressed. Here we probe bright excitons tungsten...