A5008959812- Graphene research and applications
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Carbon Nanotubes in Composites
- MXene and MAX Phase Materials
- Boron and Carbon Nanomaterials Research
- Diamond and Carbon-based Materials Research
- Fullerene Chemistry and Applications
- ZnO doping and properties
- Food Quality and Safety Studies
- Advanced NMR Techniques and Applications
- Electronic and Structural Properties of Oxides
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Mechanical and Optical Resonators
- Theoretical and Computational Physics
- Semiconductor materials and devices
- Advanced Thermoelectric Materials and Devices
- Cancer, Hypoxia, and Metabolism
- Advanced Memory and Neural Computing
- Nitric Oxide and Endothelin Effects
- Thermal properties of materials
- Polymer Nanocomposite Synthesis and Irradiation
Fudan University
1988-2025
Huaiyin Institute of Technology
2024
Tebian Electric Apparatus (China)
2024
Shanghai Ninth People's Hospital
1990-2024
University of California, Berkeley
2017-2023
Lawrence Berkeley National Laboratory
2017-2023
Kavli Energy NanoScience Institute
2017-2023
China Geological Survey
2023
The University of Tokyo
2009-2018
Chinese University of Hong Kong
2016
Bottom-up synthesized GNRs and GNR heterostructures have promising electronic properties for high performance field effect transistors (FETs) ultra-low power devices such as tunnelling FETs. However, the short length wide band gap of these prevented fabrication with desired switching behaviour. Here, by fabricating channel (Lch ~20 nm) a thin, high-k gate dielectric 9-atom (0.95 armchair material, we demonstrate FETs on-current (Ion >1 uA at Vd = -1 V) Ion/Ioff ~10^5 room temperature. We...
Abstract Functionalities of two-dimensional (2D) crystals based on semiconducting transition metal dichalcogenides (TMDs) have now stemmed from simple field effect transistors (FETs) to a variety electronic and opto-valleytronic devices even superconductivity. Among them, superconductivity is the least studied property in TMDs due methodological difficulty accessing it different TMD species. Here, we report systematic study MoSe 2 , MoTe WS by ionic gating regimes. Electrostatic using liquid...
Abstract Chirality of materials are known to affect optical, magnetic and electric properties, causing a variety nontrivial phenomena such as circular dichiroism for chiral molecules, Skyrmions in magnets nonreciprocal carrier transport conductors. On the other hand, effect chirality on superconducting has not been known. Here we report nonreciprocity superconductivity—unambiguous evidence superconductivity reflecting structure which forward backward supercurrent flows equivalent because...
Due to their favourable and rich electronic optical properties, group-VI-B transition-metal dichalcogenides (TMDs) have attracted considerable interest. They earned position in the materials portfolio of spintronics valleytronics communities. The electrical performance TMDs is enhanced by rolling up two-dimensional (2D) sheets form quasi-one-dimensional (1D) tubular structures. fabrication p-n junctions out these would boost potential for optoelectronic devices as such represent a...
In recent years, surface acoustic waves (SAWs) have emerged as a novel technique for generating quasiparticle transport and band modulation in condensed matter systems. SAWs interact with adjacent materials through piezoelectric strain fields, dragging carriers the direction of wave propagation. Most studies on acoustoelectric effect focused collective directional motion carriers, which generates steady electric potential difference, while oscillating component from dynamic spatial charge...
Ferromagnetic semiconductors offer an efficient way to achieve high spin polarization via filtering effect. Large tunneling magnetoresistance (TMR) can then be realized when multiple filters are put in series, as recently demonstrated van der Waals 2D A-type antiferromagnets such CrI_{3} and CrSBr. However, the interlayer antiferromagnetic ground state of these magnets inherently results a resistance at zero field, this volatile behavior limits potential applications. Here we fabricate...
In recent years, surface acoustic waves (SAWs) have emerged as a novel technique for generating quasiparticle transport and band modulation in condensed matter systems. SAWs interact with adjacent materials through piezoelectric strain fields, dragging carriers the direction of wave propagation. Most studies on acoustoelectric effect focused collective directional motion carriers, which generates steady electric potential difference, while oscillating component from dynamic spatial charge...
Deep ultraviolet (DUV) photodetection usually relies on wide-bandgap semiconductors, which however face challenges in material growth and doping processes. In this work, we proposed validated a scheme based tunneling barrier modulation, achieving highly sensitive DUV photodetection. Using two-dimensional van der Waals heterostructure, the device integrates MoS2 as transporting layer for its high carrier mobility low dark current, few-layered graphene (FLG) photon absorption layer, hexagonal...
We have fabricated nanocomposites consisting of 4-Å carbon nanotubes embedded in the 0.7-nm pores aluminophosphate-five (AFI) zeolite that display a superconducting specific heat transition at 15 K. MicroRaman spectra samples show strong and spatially uniform radial breathing mode (RBM) signals 510 cm −1 550 , characteristic (4, 2) (5, 0) nanotubes, respectively. The is suppressed >2 T, with temperature dependence finite-size effects. Comparison theory shows behavior to be consistent type...
We have fabricated extraordinary magnetoresistance (EMR) device, comprising a monolayer graphene with an embedded metallic disk, that exhibits large room temperature (MR) enhancement of up to 55 000% at 9 T. Finite element simulations yield predictions in excellent agreement the experiment and show possibility for even better performance. Simplicity, ease implementation high sensitivity this device imply great potential practical applications.
We present electrical and thermal specific heat measurements that show superconductivity in double-wall carbon nanotube (DWCNT) bundles. Clear evidence, comprising a resistance drop as function of temperature, magnetoresistance differential signature the supercurrent, suggest an intrinsic superconducting transition below 6.8 K for one particular sample. Additional data not only confirm existence superconductivity, but also indicate T(c) distribution can arise from diversity diameter...
We give an up-to-date review of the superconducting phenomena in 4-Angstrom carbon nanotubes embedded aligned linear pores AlPO(4)-5 (AFI) zeolite, first discovered 2001 as a fluctuation Meissner effect. With introduction new approach to sample synthesis around 2007, data confirming superconductivity have been obtained. These comprise electrical, specific heat, and magnetic measurements which together yield consistent yet complex physical picture state, largely owing one-dimensional (1D)...
Through exponential sample-size scaling of conductance, we demonstrate strong electron localization in three sets nanostructured antidot graphene samples with lengths 1.1, 2, and 3.4 μm. The large-scale mesoscopic transport is manifest as a parallel conduction channel to 2D variable range hopping, Coulomb quasigap around the Fermi level. opening correlation quasigap, observable below 25 K through temperature dependence makes possible suppression inelastic electron-electron scatterings...
Transition metal dichalcogenide nanotubes are fascinating platforms for the research of superconductivity due to their unique dimensionalities and geometries. Here we report diameter dependence in individual WS2 nanotubes. The is realized by electrochemical doping via ionic gating technique which nanotube estimated from periodic oscillating magnetoresistance, known as Little-Parks effect. critical temperature displays an unexpected linear behavior a function inverse diameter, that is,...
We report superconducting resistive transition characteristics for array(s) of coupled $4\text{ }\text{\AA{}}$ single wall carbon nanotubes embedded in aluminophosphate-five zeolite. The was observed to initiate at 15 K with a slow resistance decrease switching sharp, order magnitude drop $\ensuremath{\sim}7.5\text{ }\text{K}$. latter exhibits anisotropic magnetic field dependence, and the differential versus current (voltage) measurements show rich variety details that are consistent...
An effective way of using ionic liquid as a gate dielectric well pressure medium to tune the transport an exemplary polymer semiconductor, poly(2,5‐bis(3‐tetradecyl‐thiophene‐2‐yl)thieno[3,2‐b]thiophene) (pBTTT‐C14) is presented. Working dielectrics, liquids exhibit well‐known ability induce dense carriers (>10 20 cm −3 ) in film contributing high conductivity (≈10 2 S −1 ). In addition, it found that works at highly charged state, leading significant enhancement conductivity. By...
Quantum-confined electrons in one dimension behave as a Luttinger liquid. However, unambiguous demonstration of liquid phenomena single-walled carbon nanotubes (SWNTs) has been challenging. Here we investigate well-defined SWNT cross junctions with point contact between two liquids and combine electrical transport optical nanoscopy measurements to correlate completely different physical properties (i.e., the electron tunneling plasmon propagation) same system. The suppressed at exhibits...
Magnetoresistance (MR) oscillations serve as a hallmark of intrinsic quantum behavior, traditionally observed only in conducting systems. Here we report the discovery MR an insulating system, vertical junctions <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>CrPS</a:mi></a:mrow><a:mrow><a:mn>4</a:mn></a:mrow></a:msub></a:mrow></a:math> which is two-dimensional <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Infrared nano-spectroscopy based on scattering-type scanning near-field optical microscopy (s-SNOM) is commonly employed to probe the vibrational fingerprints of materials at nanometer length scale. However, due elongated and axisymmetric tip shank, s-SNOM less sensitive in-plane sample anisotropy in general. In this article, we report an easy-to-implement method dielectric responses with assistance a metallic disk micro-antenna. As proof-of-concept demonstration, investigate here phonon two...
Recent studies of van der Waals (vdW) heterostructures and superlattices have shown intriguing quantum phenomena, but these been largely explored only in the moderate carrier density regime. Here, we report probe high-temperature fractal Brown-Zak (BZ) oscillations through magnetotransport extreme doping regimes by applying a newly developed electron beam technique. This technique gives access to both ultrahigh hole densities beyond dielectric breakdown limit graphene/BN superlattices,...