Chuan Chen 
On the Nature of Charge Density Waves, Superconductivity and Their Interplay in 1T-TiSe₂ [PDF ebook] 

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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-Ti Se2. 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 Ti Se2.

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Table des matières

Introduction.- Excitonic character of CDWin Ti Se2.- Phenomenological model of coexisting CDWand superconductivity in Ti Se2.- Excitonic CDWfluctuations and superconductivity.- Anomalous quantum metal phase in Ti Se2.- Conclusions.- Appendices.

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Langue Anglais ● Format PDF ● Pages 105 ● ISBN 9783030298258 ● Taille du fichier 4.4 MB ● Maison d’édition Springer International Publishing ● Lieu Cham ● Pays CH ● Publié 2019 ● Téléchargeable 24 mois ● Devise EUR ● ID 7196403 ● Protection contre la copie DRM sociale

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