A5039556653- Quantum and electron transport phenomena
- Theoretical and Computational Physics
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Advanced Chemical Physics Studies
- Quantum Dots Synthesis And Properties
- Complex Systems and Time Series Analysis
- Surface and Thin Film Phenomena
- Magnetic properties of thin films
- Semiconductor materials and devices
- Chaos control and synchronization
- Electron and X-Ray Spectroscopy Techniques
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Copper-based nanomaterials and applications
- Financial Risk and Volatility Modeling
- Molecular Junctions and Nanostructures
- Topological Materials and Phenomena
- Surface Roughness and Optical Measurements
- Cellular Automata and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Iron oxide chemistry and applications
- High voltage insulation and dielectric phenomena
- Machine Learning in Materials Science
- Porphyrin and Phthalocyanine Chemistry
University of Science and Technology of China
2013-2024
Hefei National Center for Physical Sciences at Nanoscale
2007-2024
National Institute for Materials Science
2007-2020
Hefei University
2017-2019
Chinese Academy of Sciences
2018
Northwest Institute of Nuclear Technology
2013
Shandong University
2011
Western University
2006-2007
Abstract The development of next-generation electronics is much dependent on the discovery materials with exceptional surface-state spin and valley properties. Because that, bismuth has attracted a renewed interest in recent years. However, despite extensive studies, intrinsic electronic transport properties Bi surfaces are largely undetermined due to strong interference from bulk. Here we report unambiguous determination Landau levels (111) ultrathin films using scanning tunnelling...
Abstract Transition metal oxides (TMOs) exhibit fascinating physicochemical properties, which originate from the diverse coordination structures between transition and oxygen atoms. Accurate determination of such structure-property relationships TMOs requires to correlate structural electronic properties by capturing global parameters with high resolution in energy, real, momentum spaces, but it is still challenging. Herein, we report characteristic environments on prototypical anatase-TiO 2...
Abstract Characterization techniques available for bulk or thin-film solid-state materials have been extended to substrate-supported nanomaterials, but generally non-quantitatively. This is because the nanomaterial signals are inevitably buried in from underlying substrate common reflection-configuration techniques. Here, we propose a virtual method, inspired by four-point probe technique resistance measurement as well chop-nod method infrared astronomy, characterize nanomaterials without...
Folding can be an effective way to tailor the electronic properties of graphene and has attracted wide study interest in finding its novel properties. Here we present experimental characterizations structural a narrow wrinkle on SiO2/Si substrate using scanning tunneling microscopy/spectroscopy. Pronounced nearly equally separated conductance peaks are observed dI/dV spectra wrinkle. We attribute these pseudo-Landau levels (PLLs) that caused by gradient-strain-induced pseudomagnetic field up...
We report direct experimental evidence showing that the spin polarization $P$ at surface of clean Fe${}_{3}$O${}_{4}$(111) is positive Fermi level ${E}_{\mathrm{F}}$ as measured using a spin-polarized metastable helium beam [He(2${}^{3}$$S$)] and bulk single crystal under high magnetic fields up to 4 T. Density functional theory calculations confirm this surprising result, which has significant implications for incorporation magnetite in spintronic device applications. also find passivation...
The electronic and topological properties of Bi(110) ultrathin films epitaxially grown on a Cu(111) substrate are investigated using scanning tunneling microscopy/spectroscopy, combined with density functional theory calculations. Bilayer-by-bilayer growth the is observed, which manifests structure black-phosphorus-like Bi bilayers (BLs), thickness up to 4 BLs. surface atomic buckling heights in 1-BL 2-BL clearly identified depend stacking modes respect well-ordered atoms adlayer covered...
The authors have found that the directionality of orbital populated following core-level x-ray absorption a hexagonal nanostructure has strong influence on resulting optical luminescence yield spectra. For ZnO, there is an enhancement band gap exciton O 1s to 2pz relative 2px,y excitation. defect excitation spectrum also shows sensitivity nature (surface or bulk).
Spatially resolved cathodoluminescence spectra are collected along the scanning positions of electron beam across an individual hexagonally cross-sectioned ZnO nanowire to probe surface effect on deep-level (DL) emissions nanowire. A double-peak feature DL emission intensity is observed in versus position when scans from one edge other. This spatial variation can be well-described by a simple core−shell model considering strong effect. By further quasi-quantitative analysis and comparison...
First-principles calculations have been performed to study the electronic and magnetic properties of metal phthalocyanine molecules (MPc, M = Mn, Fe, Cu) on an Fe(100) surface. All three MPc prefer their central atom top site orientation with M–N1 bond along ⟨110⟩ direction. Similar molecular distortions are observed among these upon adsorption. The spin-resolved structures reveal that spin-polarized states Mn Fe atoms in MnPc FePc significantly changed due relatively strong interactions...
The geometric and spin-resolved electronic structure of a graphene-adsorbed Ni(111) surface has been investigated by density functional theory (DFT) calculations without with semiempirical long-range dispersion correction (DFT-D). DFT generalized gradient approximation (GGA) cannot predict well about the adsorption properties graphene to surface. While DFT-D same GGA give reasonable values energy layer distance from substrate. geometry top_fcc is most energetically favorable in all...
We report the structural analysis and spin-dependent band structure of hydrogenated boron nitride adsorbed on Ni(111).
Using a spin-polarized metastable helium beam, we have investigated the remanent spin polarization at surface of clean, hydrogen-terminated and benzene-adsorbed Fe 3 O 4 (0 0 1) thin films prepared on MgO(0 substrates. For clean surface, small negative asymmetry is detected in ejected electron yields for helium-electron spins aligned parallel anti-parallel to sample magnetization direction. This confirms earlier experimental results from less surface-sensitive techniques which show that much...
The structure and spin-resolved electronic states of a graphene-adsorbed Fe/Ni(1 1 1) surface are investigated compared with graphene/Ni(1 using first-principles calculations. Nine possible geometries studied Fe C atoms at different sites respect to the topmost Ni atoms. Geometries one atom located on top an (C1) hollow (fcc or hcp) site (C2) most energetically favourable. graphene significantly modified by interaction surface. dominant π C2 drastically shifted towards Fermi level become...
The geometric, electronic, and magnetic structures of a manganese phthalocyanine (MnPc) molecule on an antiferromagnetic IrMn(100) surface are studied by density functional theory calculations. Two kinds orientation the adsorbed MnPc predicted to coexist due molecular self-assembly surface—a top-site geometry with Mn–N bonds aligned along ⟨100⟩ direction, hollow-site in which parallel ⟨110⟩ direction. is antiferromagnetically coupled substrate at top site slight reduction moment Mn atom...
We report our investigation on the electronic properties of step edges a Bi(1 1 1) surface in epitiaxially grown thin films, using scanning tunneling microscopy and spectroscopy. Our results show three differential conductance peaks including previously reported peak spectra recorded at edges. analysis indicates that all can be ascribed to van Hove singularities thus band extrema one-dimensional edge bands, according quasiparticle interference Fourier transform patterns. These states an...
Reversible control of the spin state an organic molecule is significant for development molecular spintronic devices.
The adsorptions of Xe atoms on the Pd(111) and Cu(111) surfaces are investigated by first-principles calculations. van der Waals interactions considered in optimization geometric structure. equilibrium distance from atom to topmost surface layer rumpling substrate closer experimental data than conventional calculations without including interactions. existence induced states, which partially filled electron back donation, is predicted calculated local density states. mechanism sublevel...