On the Nature of Charge Density Waves Superconductivity and Their Interplay in 1T-TiSe₂ 1st edition by Chuan Chen 9783030298258 3030298256

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• ISBN 10:3030298256 

• ISBN 13:9783030298258

• Author:Chuan Chen 

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

On the Nature of Charge Density Waves Superconductivity and Their Interplay in 1T-TiSe₂ 1st  Table of contents:

1. Introduction
2. Excitonic Character of CDW in TiSe2
3. Phenomenological Model of Coexisting CDW and Superconductivity in TiSe2
4. Excitonic CDW Fluctuations and Superconductivity
5. Anomalous Quantum Metal Phase in TiSe2
6. Conclusions

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