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stm and sts investigations of Ce-doped TiO_2 nanoparticles

Rare Metals 2006年第4期25卷 331-336页

作者： HOU Tinghong MAO Jian ZHU Xiaodong TU Mingjing College of Materials Science and Engineering Sichuan University Chengdu 610064 China

Ce-doped titanium oxide nanoparticles were investigated in the paper. The surface structures of undoped and Ce-doped TiO2 nanoparticles were observed by scanning tunneling microscopy （stm）. The experimental results of scanning tunneling spectroscopy （sts） show that the surface electronic structures of TiO2 nanoparticles are modified by introducing new electronic states in the surface band gap through cerium ion doping. The results are discussed in terms of the influence of doping concentration on the surface band gap of TiO2.

关键词： semiconductor materials TiO2 nanoparticle stm/sts Ce-doping

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Epitaxial growth of ultrathin gallium films on Cd(0001)

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Chinese Physics B 2024年第1期33卷 722-727页

作者：李佐石明霞姚钢陶敏龙王俊忠 School of Physical Science and Technology Southwest UniversityChongqing 400715China School of Science Guizhou University of Engineering ScienceBijie 551700China

Growth and electronic properties of ultrathin Ga films on Cd(0001) are investigated by low-temperature scanning tunneling microscopy(stm) and density functional theory(DFT) calculations. It is found that Ga films exhibit the epitaxial growth with the pseudomorphic 1×1 lattice. The Ga islands deposited at 100 K show a ramified shape due to the suppressed edge diffusion and corner crossing. Furthermore, the majority of Ga islands reveal flat tops and a preferred height of three atomic layers, indicating the electronic growth at low temperature. Annealing to room temperature leads to not only the growth mode transition from electronic growth to conventional Stranski–Krastanov growth, but also the shape transition from ramified islands to smooth compact islands. Scanning tunneling spectroscopy(sts) measurements reveal that the Ga monolayer exhibits metallic behavior. DFT calculations indicate that all the interfacial Ga atoms occupy the energetically favorable hcp-hollow sites of the substrate. The charge density difference analysis demonstrates that the charge transfer from the Cd substrate to the Ga atoms is negligible, and there is weak interaction between Ga atoms and the Cd substrate. These results shall shed important light on fabrication of ultrathin Ga films on metal substrates with novel physical properties.

关键词： gallium films electronic growth stm/sts density functional theory

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Quasi-freestanding, striped WS2 monolayer with an invariable band gap on Au（001）

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Nano Research 2017年第11期10卷 3875-3884页

作者： Min Hong Xiebo Zhou Jianping Shi Yue Qi Zhepeng Zhang Qiyi Fang Yaguang Guo Yajuan Sun Zhongfan Liu Yuanchang Li Qian Wang Yanfeng Zhang Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Center for Nanochemistry(CNC) Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China State Key Laboratory of Coal-based Low-carbon Energy ENN Group Co. Ltd. Langfang 065001 China National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing 100190 China Center for Applied Physics and Technology Peking University Beijing 100871 China

Revealing the structural/electronic features and interfacial interactions of monolayer MoS2 and WS2 on metals is essential to evaluating the performance of related *** this study,we focused on the atomic-scale features of monolayer WS2 on Au（001） synthesized via chemical vapor *** tunneling microscopy and spectroscopy reveal that the WS2/Au（001） system exhibits a striped superstructure similar to that of MoS2/Au（001） but weaker interfacial interactions,as evidenced by experimental and theoretical ***,the WS2/Au（001） band gap exhibits a relatively intrinsic value of ～ 2.0 ***,the band gap can gradually decrease to ～ 1.5 eV when the sample annealing temperature increases from ～370 to 720 ℃.In addition,the doping level （or Fermi energy） of monolayer WS2/Au（001） varies little over the valley and ridge regions of the striped patterns because of the homogenous distributions of point defects introduced by ***,this work provides an in-depth investigation into the interfacial interactions and electronic properties of monolayer MX2 on metal substrates.

关键词： WS2 Au(001) striped superstructure interfacial interaction stm/sts

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Landau quantization of Dirac fermions in graphene and its multilayers

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Frontiers of physics 2017年第4期12卷 85-121页

作者： Long-Jing Yin Ke-Ke Bai Wen-Xiao Wang Si-Yu Li Yu Zhang Lin He The Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing 100875 China

When electrons are confined in a two-dimensional （2D） system, typical quantum-mechanical phenonl- ena such as Landau quantization can be detected. Graphene systems, including the single atomic layer and few-layer stacked crystals, are ideal 2D materials for studying a variety of quantum-mechanical problems. In this article, we review the experimental progress in the unusual Landau quantized behav- iors of Dirac fernlions in monolayer and multilayer graphene by using scanning tunneling microscopy （stm） and scanning tulmeling spectroscopy （sts）. Through sts measurement of the strong mag- netic fields, distinct Landau-level spectra and rich level-splitting phenomena are observed in different graphene layers. These unique properties provide an effective method for identifying the number of layers, as well as the stacking orders, and investigating the fllndamentally physical phenomena of graphene. Moreover, in the presence of a strain and charged defects, the Landau quantization of graphene can be significantly modified, leading to unusual spectroscopic and electronic properties.

关键词： Landau quantization graphene stm/sts stacking order strain and defect

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Advances in bismuth-based topological quantum materials by scanning tunneling microscopy

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Materials Futures 2022年第3期1卷 68-83页

作者： Yaqi Li Jingwei Zhang Xun Xu Weichang Hao Jincheng Zhuang Yi Du School of Physics Beihang UniversityHaidian DistrictBeijing 100191People’s Republic of China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongWollongongNew South Wales 2500Australia

In recent years,topological quantum materials(TQMs)have attracted intensive attention in the area of condensed matter physics due to their novel topologies and their promising applications in quantum computing,spin electronics and next-generation integrated *** tunneling microscopy/spectroscopy(stm/sts)is regarded as a powerful technique to characterize the local density of states with atomic resolution,which is ideally suited to the measurement of the bulk-boundary correspondence of *** this review,using stm/sts,we focus on recent research on bismuth-based TQMs,including quantum-spin Hall insulators,3D weak topological insulators(TIs),high-order TIs,topological Dirac semi-metals and dual *** methods for the modulation of the topological properties of the TQMs are introduced,such as interlayer interaction,thickness variation and local electric field ***,the challenges and prospects for this field of study are discussed.

关键词： stm/sts topological quantum materials bismuth spin-orbit coupling

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Centimeter-scale,Highly-Ordered,Continuous Graphene on Metal Surface and Its Moiré Template Effect

Centimeter-scale,Highly-Ordered,Continuous Graphene on Metal...

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中国化学会第27届学术年会

作者：潘毅高敏张海刚毛金海姜宇航黄立周海涛张余洋郭海明高鸿钧 Institute of Physics Chinese Academy of Sciences

The limited size and quality of the single- and multi-layer graphene synthesized with the existing methods hinders the investigation of the intrinsic physical properties of the graphene and realization of its potential applications. We will present a new method for synthesizing large scale single layer graphene by thermal annealing of ruthenium single crystal containing carbon. Low energy electron diffraction （LEED） and scanning tunneling microscopy （stm） indicate the graphene grows to as large as millimeter dimensions with good long-range order, continuity, and perfect crystallinity. Such high quality sample has allowed a single layer graphene to greatly modulate the thermoelectric potential and polarity of the system. Furthermore, the adsorption behavior of clusters and molecules using the graphene-based Moiré pattern will also be presented.

关键词： Graphene stm/sts Thermoelectricity Quantum dots

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Modification of magnetic properties of a manganese phthalocyanine by coordination of CO molecule

Modification of magnetic properties of a manganese phthalocy...

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第18届国际真空大会

作者： A. Strozecka M. S. Santacruz J. Fernandez-Rossier J. I. Pascual Institute of Experimental Physics Free University Berlin Department of Applied Physics University of Alicante

The coordintation of small molecules, like NO, CO or O2, to transition metal phthalocyanines can substantially modify properties of these complexes and their interaction with underlying substrate. We investigated the effect of coadsorption of CO molecules on magnetic properties of manganese phthalocyanines （MnPc） adsorbed on Bi（110） surface. stm experiments reveal a pronounced zero bias anomaly in the tunneling spectra of MnPc, which we attribute to the Kondo effect originating from coupling of molecular magnetic moment to the electrons of the substrate. Bonding of CO to a central metal ion changes the Kondo resonance and leads to the broadening of the zero bias feature. According to DFT calculations, CO-coordination reduces the spin of the complex from 3/2 to 1/2, which explains the increase of the Kondo temperature. The original magnetic state of MnPc is recovered after controlled and selective field-induced desorption of the CO molecules.

关键词： manganese phthalocyanine Kondo effect magnetic molecules stm/sts

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