A5103172271- Electronic and Structural Properties of Oxides
- Surface and Thin Film Phenomena
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Advanced Photocatalysis Techniques
- Magnetic properties of thin films
- Semiconductor materials and interfaces
- Metal-Organic Frameworks: Synthesis and Applications
- Quantum and electron transport phenomena
- Organoboron and organosilicon chemistry
- Theoretical and Computational Physics
- Semiconductor materials and devices
- Organic and Molecular Conductors Research
- Luminescence and Fluorescent Materials
- Organometallic Complex Synthesis and Catalysis
- Advanced Condensed Matter Physics
- Molecular Sensors and Ion Detection
- Luminescence Properties of Advanced Materials
- 2D Materials and Applications
- Perovskite Materials and Applications
- Asymmetric Hydrogenation and Catalysis
- Lanthanide and Transition Metal Complexes
- Nanoplatforms for cancer theranostics
- Topological Materials and Phenomena
- Advanced Nanomaterials in Catalysis
Yangzhou University
2024-2025
Chinese Academy of Sciences
2009-2025
University of Chinese Academy of Sciences
2017-2025
Czech Academy of Sciences, Institute of Physics
2023-2025
Institute of Physics
2007-2024
Northeast Forestry University
2024
Taiyuan University of Technology
2019-2023
Physical Sciences (United States)
2023
Songshan Lake Materials Laboratory
2020-2022
Beijing Academy of Quantum Information Sciences
2020
Significance Charge density waves (CDWs) are observed in many solids, especially low-dimensional systems. Their existence was first predicted the 1930s by Rudolf Peierls, who prophesied that CDWs would exist an ideal one-dimensional (1D) chain of atoms, lowering energy system and driving a reconstruction lattice. In 1959, Walter Kohn pointed out this nesting results what is now known as “Kohn anomaly,” simultaneous softening coherent lattice vibrations, i.e., phonon softening. This simple...
Charge density wave (CDW) is an important concept in condensed matter physics, germane to a number of physical phenomena. But the origin CDW still under debate, partly because and properties are highly material-dependent. The has been applied many materials without clear definition fundamental nature CDW. As result, misconceptions about can be seen literature. In this review, we will try describe explain possible existing associated with CDWs.
Silacycles have exhibited significant potential for application in the fields of medicinal chemistry, agrochemistry, and materials science. Accordingly, development effective methods synthesizing these compounds has attracted increasing attention. Here, we report an efficient Cu-catalyzed enantioselective hydrosilylation arylmethylenecyclopropanes with hydrosilanes, that allows rapid assembly various enantioenriched carbon- silicon-stereogenic silacyclopentanes good yields excellent...
Nonlinear optical (NLO) crystals are critical for modern devices. In this study, two new hybrid metal halides, (C6H5N2)2CdCl4 (1) and (C6H5N2)2ZnCl4 (2), were synthesized by a mild solution method. 1 2 crystallize in different chiral space groups of P43212 P212121, respectively. Their crystal structures composed [MX4]2– (M = Cd, Zn) tetrahedrons (C6H5N2)+ cations with arrangements. They both have wide band gaps (3.98 3.83 eV). Attractively, exhibits SHG (second-harmonic generation) effect...
High resolution electron energy loss spectroscopy (HREELS) is a powerful technique to probe vibrational and electronic excitations at surfaces. The dispersion relation of surface excitations, i.e., as function momentum, has in the past, been obtained by measuring fixed angle (momentum) then rotating sample, monochromator, or analyzer. Here, we introduce new strategy for HREELS, utilizing specially designed lens system with double-cylindrical Ibach-type monochromator combined commercial VG...
We have found strong visible photoluminescence (PL) from 0.4 nm carbon nanotubes embedded in the ordered channels of a zeolite crystal matrix. The PL exhibits broad emission band with an efficiency $\ensuremath{\sim}1%--5%$. Strong polarization dependence is observed both on excitation and emission, indicating preferential optical dipole along axis nanotubes. By correlating absorption Raman spectra, we identify $(3,3)$ $(4,2)$ tubes to be responsible for peaks at $\ensuremath{\sim}2.6$...
In the fields of photolithographic patterning, optical anticounterfeiting, and information encryption, reversible photochromic materials with solid-state fluorescence are emerging as a potential class systems. A design strategy for has been proposed synthesized through introduction photoactive thiophene groups into molecular backbone aryl vinyls, compounds unique aggregation-induced emission properties, photocontrollable color-changing properties. This work develops novel inks, films,...
The structural (4 x 1) to (8 2) transition and the electronic metal semimetal at In/Si interface are studied with scanning tunneling microscopy spectroscopy. Both transitions gradual, resulting in a complex domain structure temperature regime. At these intermediate temperatures, metallic semimetallic domains coexist each other new nanophases. By probing two intertwined but distinguishable atomic level, interaction between different phases is visualized directly.
We report direct visualizations of the fluctuation and condensation phenomena in a phase transition one-dimensional (1D) In/Si(111) system using scanning tunneling microscopy. The high-temperature (HT) low-temperature (LT) phases are found to coexist on nanometer scale near Tc. Above Tc, 1D LT-phase stripes fluctuate HT coalesce into 2D islands with decreasing temperature. They condense make LT below Small areas also exist observed temperature-dependent evolution nanoscale inhomogeneities is...
The ground state properties of indium atom chains on the Si(111) 8 x 2-In surface and nature their insulator-metal (IM) transition near 120 K are under intense dispute. We compare experimental scanning tunneling microscopy (STM) images low temperature (LT) 2 phase with STM image calculations from Density Functional Theory (DFT). Our LT studies clearly indicate existence a frozen shear distortion between neighboring chains, resulting in formation hexagons. Tunneling spectra furthermore that...
Recently the charge density wave (CDW) in vanadium dichalcogenides have attracted increasing research interests, but a real-space investigation on symmetry breaking of CDW state VTe2 monolayer is still lacking. We investigated by low energy electron diffraction (LEED) and scanning tunneling microscope (STM). While LEED experiments revealed (4X4) transition at 192+-2 K, our low-temperature STM resolved lattice distortions charge-density modulation real space, further unveiled 1D that breaks...
1T-TiSe_{2} is one of the most studied charge density wave (CDW) systems, not only because its peculiar properties related to CDW transition, but also due status as a promising candidate exciton insulator signaled by proposed plasmon softening at vector. Using high-resolution electron energy loss spectroscopy, we report systematic study temperature-dependent behaviors 1T-TiSe_{2}. We unambiguously resolve from phonon modes, revealing existence Landau damping finite momentums, which does...
For self-assembled nanodots, the ultimate dream is to simultaneously achieve tunable uniformity in size, spatial distribution, chemical composition, and crystallographic orientation. By utilizing Volmer–Weber growth mode thin film epitaxy, we have grown two-dimensional arrays of FePt alloy nanodots that are uniform all crystallgraphically aligned. These dot assemblies ferromagnetic at room temperature can be easily transferred onto other templates without destroying size orientation uniformity.
The optical properties of the oxide compounds PbO and SnO2 have been investigated experimentally by transmission spectroscopy measurements theoretically a full-potential linearized augmented plane wave (FPLAPW) method. dielectric functions rutile TiO2 has also calculated. calculated band-gap energies as well absorption were found to be in very good qualitatively agreement with experimental results.
Uniform arrays of monatomic Fe chains are realized on a vicinal $\mathrm{Cu}(111)$ surface with regular step array. Deposited atoms first embedded into the flat terrace at precisely one-atom distance away from upper edge step. The resulting wires, in turn, serve as one-dimensional nucleation lines for formation along edges steps. present results, obtained by scanning tunneling microscopy and interpreted first-principles calculations, unambiguously establish essential role precursor to wire...
High-resolution electron energy loss spectroscopy measurements have been carried out on an optimally doped cuprate Bi(2)Sr(2)CaCu(2)O(8+δ). The momentum-dependent and linewidth of A1 optical phonon were obtained. Based these data as well detailed knowledge the electronic structure, we developed a scheme to determine electron-phonon coupling (EPC) matrix element related specific mode. Such approach is general applicable elucidating full structure EPC in system with anisotropic structure.