Temperature-dependent photoemission on1T-TiSe2: Interpretation within the exciton condensate phase model

2009/11/02 by Claude Monney, C. Monney, E. F. Schwier +12 · 3 citations
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Atmospheric temperature range #Condensed matter physics #Cuprate #Exciton #Materials science #Molecular Junctions and Nanostructures #Organic and Molecular Conductors Research #Phase (matter) #Phase transition #Physics #Pseudogap #Quantum mechanics #Superconductivity #Thermodynamics #Transition temperature #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.81.155104

8 pages, 6 figures

arxiv created 2009/11/02 · openalex publication_date 2010/04/06 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The charge-density-wave phase transition of 1T-TiSe₂ is studied by angle-resolved photoemission over a wide temperature range. An important chemical-potential shift which strongly evolves with temperature is evidenced. In the framework of the exciton condensate phase, the detailed temperature dependence of the associated order parameter is extracted. Having a mean-field-like behavior at low temperature, it exhibits a nonzero value above the transition, interpreted as the signature of strong excitonic fluctuations, reminiscent of the pseudogap phase of high-temperature superconductors. Integrated intensity around the Fermi level is found to display a trend similar to the measured resistivity and is discussed within the model.

Citations

• Fabrication and superconductivity ofNaxTaS2crystals
• Structural distortion in TiSe2and related materials-a possible Jahn-Teller effect?
• Evidence for an Excitonic Insulator Phase in1T−TiSe2
• Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model
• Probing the Electronic Structure of Complex Systems by ARPES

Cited by

• Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5
• Impact ionization dynamics in small band-gap two-dimensional materials from a coherent phonon mechanism
• Electric and magnetic multipoles and bond orders in excitonic insulators

Related

• Dramatic effective mass reduction driven by strong electronic correlations
• Evidence for breathing-type pseudo Jahn-Teller distortions in the charge density wave phase of 1T-TiSe₂
• Electron-phonon-dominated charge-density-wave fluctuations in TiSe₂ accessed by ultrafast nonequilibrium dynamics
• Unveiling the Semimetallic Nature of 1T-TiSe₂ by Doping its Charge Density Wave
• Inconsistencies between experimental and theoretical band structure of TiSe₂