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On the Nature of Charge Density Waves, Superconductivity and Their Interplay in 1T-TiSe₂

  • Book
  • © 2019

Overview

Authors:
  1. Chuan Chen

    1. Center for Advanced 2D Materials, National University of Singapore, Singapore, Singapore

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  • Nominated as an outstanding Ph.D. thesis by the National University Of Singapore, Singapore, Singapore
  • Includes a concise review of the research on charge density wave and superconductivity in 1T-TiSe2
  • Presents both a phenomenological and a microscopic study of the interplay between charge density wave and superconductivity

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (6 chapters)

  1. Front Matter

    Pages i-xvi
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  2. Introduction

    • Chuan Chen
    Pages 1-14

  3. Excitonic Character of CDW in TiSe2

    • Chuan Chen
    Pages 15-29

  4. Phenomenological Model of Coexisting CDW and Superconductivity in TiSe2

    • Chuan Chen
    Pages 31-49

  5. Excitonic CDW Fluctuations and Superconductivity

    • Chuan Chen
    Pages 51-67

  6. Anomalous Quantum Metal Phase in TiSe2

    • Chuan Chen
    Pages 69-81

  7. Conclusions

    • Chuan Chen
    Pages 83-85

  8. Back Matter

    Pages 87-105
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Keywords

About this book

This thesis presents analytical theoretical studies on the interplay between charge density waves (CDW) and superconductivity (SC) in the actively studied transition-metal dichalcogenide 1T-TiSe2. It begins by reapproaching a years-long debate over the nature of the phase transition to the  commensurate CDW (CCDW) state and the role played by the intrinsic tendency towards excitonic condensation in this system.  A Ginzburg-Landau phenomenological theory was subsequently developed to understand the experimentally observed transition from commensurate to incommensurate CDW (ICDW) order with doping or pressure, and the emergence of a superconducting dome that coexists with ICDW. Finally, to characterize microscopically the effects of the interplay between CDW and SC, the spectrum of CDW fluctuations beyond mean-field was studied in detail. In the aggregate, the work reported here provides an encompassing understanding of what are possibly key microscopic underpinnings of the CDWand SC physics in TiSe2.   

Authors and Affiliations

  • Center for Advanced 2D Materials, National University of Singapore, Singapore, Singapore

    Chuan Chen

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