Temperature dependent photoemission on 1T-TiSe2: Interpretation within the exciton condensate phase model

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 behaviour at low temperature, it exhibits a non-zero value above the transition, interpreted as the signature of strong excitonic fluctuations, reminiscent of the pseudo-gap 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.

8 pages, 6 figures

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Cited by in corpus (52)

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• Chiral charge order in 1$T$-TiSe${}_2$: importance of lattice degrees of freedom
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• Competition between excitonic charge and spin density waves: Influence of electron-phonon and Hund's rule couplings
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• Semimetal-to-semiconductor transition and charge-density-wave melting in $1T$-TiSe${}_{2-x}$S${}_x$ single crystals
• Slave-boson field fluctuation approach to the extended Falicov-Kimball model: charge, orbital, and excitonic susceptibilities
• A New Era of Excitonic Insulators
• Dramatic Plasmon Response to the Charge-Density-Wave Gap Development in $1\text{T}-{\mathrm{TiSe}}_2$
• Charge Density Wave Hampers Exciton Condensation in 1T-TiSe${}_2$
• Ultrafast Switching from the Charge Density Wave Phase to a Metastable Metallic State in 1T-TiSe${}_2$
• Correlation between electronic and structural orders in 1T-TiSe2
• Electric and magnetic multipoles and bond orders in excitonic insulators
• Phase Separation in the Vicinity of Fermi Surface Hot Spots
• Evidence for an Excitonic Insulator State in Ta${}_2$Pd${}_3$Te${}_5$
• New Lithium- and Diamines-Intercalated Superconductors Li${}_x$(C${}_2$H${}_8$N${}_2$)${}_y$TiSe${}_2$ and Li${}_x$(C${}_6$H${}_{16}$N${}_2$)${}_y$TiSe${}_2$
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• Ultrafast creation of a light induced semimetallic state in strongly excited 1T-TiSe${}_2$
• Ultrafast charge carrier and exciton dynamics in an excitonic insulator probed by time-resolved photoemission spectroscopy
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• Lattice fluctuations, not excitonic correlations, mediated electronic localization in TiSe${}_2$
• Pressure Driven Phase Transition in 1T-TiSe${}_2$ , a MOIPT+DMFT Study
• Charge-Density-Wave Order in 2H-NbSe${}_2$
• Van der Waals Schottky barriers as interface probes of the correlation between chemical potential shifts and charge density wave formation in 1T-TiSe${}_2$ and 2H-NbSe${}_2$
• Mapping the dispersion of the occupied and unoccupied band structure in photoexcited 1T-TiSe${}_2$
• Coherent exciton transport in semiconductors
• Temperature effects in excitonic condensation driven by the lattice distortion
• Collective modes and Raman response in Ta${}_2$NiSe${}_5$
• Impact ionization dynamics in small band-gap 2D materials from a coherent phonon mechanism
• Persistence of charge ordering instability to Coulomb engineering in the excitonic insulator candidate TiSe${}_2$
• Spectroscopic fingerprints of many-body renormalizations in$1T$-TiSe${}_2$
• Ultrafast melting of charge-density wave fluctuations at room temperature in $1T-TiS{e}_2$ monitored under non-equilibrium conditions
• Electron-phonon-dominated charge-density-wave fluctuations in TiSe${}_2$ accessed by ultrafast nonequilibrium dynamics
• Observation of Dirac Charge Density Waves in Bi${}_2$Te${}_2$Se
• Optical amplification in a CDW-phase of a quasi-two dimensional material
• Unusual temperature dependence of the band structure associated with local atomic distortion in monolayer 1T'-WTe2
• Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-delta: X-ray absorption and photoemission studies
• Excitons and Optical Response in Excitonic Insulator Candidate TiSe${}_2$
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