With the great success of graphene,two dimensional（2D）layered materials become the research focus of intense due to their unique physical and electronic properties.These promising materials have quite interesting optical and electronic properties are typically diverse due to confinement of electrons,but also due to the weak interlayer interactions.Thus,2D materials are composed of insulators,semiconductors and semimetal.Among various 2Ds,zirconium（Zr）based layered materials are ideal objects bec... 

【文章頁數(shù)】：175 頁

【學(xué)位級別】：博士

【文章目錄】：
ABSTRACT
Acknowledgement
List of Abbreviations
Chapter 1. Introduction
    1.1. Introduction
    1.2. 2D Materials
    1.3. 2D Transition Metal Dichalcogenides (TMDs)
        1.3.1. Atomic and Structural Configuration of TMDs
        1.3.2. Layered Structures of 2D TMDs
        1.3.3. Classification of 2D TMDs
    1.4. Single Crystals Growth of TMDs using Chemical Vapor Transport (CVT)Method
        1.4.1. Principles of CVT Method
        1.4.2. Chemical Vapor Transport Method
    1.5. First Principle Calculations
        1.5.1. Density Functional Theory (DFT)
    1.6. Angle-Resolved Photoemission Spectroscopy (ARPES)
        1.6.1. Synchrotron Based ARPES System
    1.7. Physical and Electronics Properties of TMDs
        1.7.1. Structural, Electronic and Magnetic Properties
            1.7.1.1. Magnetism and Magnetic Properties of TMDs
                1.7.1.1.1. Types of Magnetism
            1.7.1.2. Superconductivity and Charge Density Wave
            1.7.1.3. Electrical Properties of TMDs
    1.8. Organization of Thesis
    1.9. References
Chapter 2. Room Temperature Ferromagnetism in Fe-doped Semiconductor ZrS_2Single Crystals
    2.1. Introduction
    2.2. Experiments and Methods
        2.2.1. Single Crystals Growth
        2.2.2. Computational Methods and Detail
        2.2.3. Characterizations
    2.3. Results and Discussions
        2.3.1. Structures Characterizations
        2.3.2. Magnetic Properties and Results
    2.4. Summary and Conclusions
    2.5. References
Chapter 3. Electron doping induced semiconductor to metal transitions in ZrSe_2layers via copper atomic intercalation
    3.1. Introduction
    3.2. Experiments and Methods
        3.2.1. CVT growth of ZrSe_2 and Cu_xZrSe_2 Crystals
        3.2.2. Computational Method and Detail
        3.2.3. Material Characterizations
    3.3. Results and Discussions
        3.3.1. Structural and Morphological Analysis
        3.3.2. Electronic and Electrical Properties
    3.4. Concluding Remarks
    3.5. References
Chapter 4. Emergence of conduction band-induced semiconductor-to-metaltransition in ZrSe_2 through Hf substitution
    4.1. Introduction
    4.2. Experiments and Methods
        4.2.1. Preparation of ZrSe_2 and Zr_(1-x)Hf_xSe_2 Single Crystals
        4.2.2. DFT Calculations Methods and Detail
        4.2.3. Material Characterizations
    4.3. Results and Discussions
        4.3.1. Structures Analysis
        4.3.2. Transport and Electronic Study of of Zr_(1-x)Hf_xSe_2 in Comparsion withZrSe_2
    4.4. Summary
    4.5. References
Chapter 5. Degenerating of Valence Band Splitting and Band Gap Opening ofZrTe_2 with Se Substitutions
    5.1. Introduction
    5.2. Experiments and Methods
        5.2.1. Growth of ZrTe_2 and ZrTe_(2(1-x))Se_(2x) Single Crystals
        5.2.2. Computational Method and Details
        5.2.3. Material Characterizations
    5.3. Results and Discussions
        5.3.1. Structural and Morphological Analysis
        5.3.2. Electronic Study of ZrTe_2 and ZrTe_(2(1-x))Se_(2x) using ARPES Combinedwith DFT Calculations
    5.4. Summary
    5.5. References
Chapter 6. High Temperature Superconductivity and Charge Density Wave in Cr-Intercalated ZrTe_2 and Hf-Substituted ZrTe_2
    6.1. Introduction
    6.2. Experiments and Methods
        6.2.1. Growth of ZrTe_2, Cr_xZrTe_2 and Hf_xZr_(1-x)Te_2 Single Crystals
        6.2.2. Material Characterizations
    6.3. Results and Discussions
        6.3.1. Structural and Morphological Analysis
        6.3.2. Superconductivity and Charge Density Wave in Cr-IntercalatedZrTe_2
        6.3.3. Superconductivity and Charge Density Wave in Hf-SubstitutedZrTe_2
    6.4. Summary
    6.5. References
Chapter 7. Complete Summary and Future Prospects
List of Publications


【參考文獻】：
期刊論文
[1]Valley excitons in two-dimensional semiconductors[J]. Hongyi Yu,Xiaodong Cui,Xiaodong Xu,Wang Yao.  National Science Review. 2015(01)



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