Spectroscopic fingerprints of many-body renormalizations in$1T$-TiSe${}_2$

Abstract

We have employed high resolution angle resolved photoemission spectroscopy (ARPES) measurements to investigate many-body renormalizations of the single-particle excitations in $1T$-TiSe${}_2$. The energy distribution curves of the ARPES data reveal intrinsic peak-dip-hump feature, while the electronic dispersion derived from the momentum distribution curves of the data highlights, for the first time, multiple kink structures. These are canonical signatures of a coupling between the electronic degrees of freedom and some Bosonic mode in the system. We demonstrate this using a model calculation of the single-particle spectral function at the presence of an electron-Boson coupling. From the self-energy analysis of our ARPES data, we discern some of the critical energy scales of the involved Bosonic mode, which are $\sim$15 and 26 meV. Based on a comparison between these energies and the characteristic energy scales of our Raman scattering data, we identify these Bosonic modes as Raman active breathing (${\text{A}}_{\text{1g}}$) and shear (${\text{E}}_{\text{g}}$) modes, respectively. Direct observation of the band-renormalization due to electron-phonon coupling increases the possibility that electron-phonon interactions are central to the collective quantum states such as charge density wave (CDW) and superconductivity in the compounds based on $1T$-TiSe${}_2$.

arXiv comment7 pages, 4 figures

References in corpus (34)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Quantum Criticality in Heavy Fermion Metals
• Superconductivity in Cu_xTiSe_2
• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• Signatures of exciton condensation in a transition metal dichalcogenide
• Many-body Effects in Angle-resolved Photoemission: Quasiparticle Energy and Lifetime of a Mo(110) Surface State
• Non-thermal separation of electronic and structural orders in a persisting charge density wave
• Charge density wave and superconducting dome in TiSe2 from electron-phonon interaction
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Semimetal to semimetal charge density wave transition in 1T-TiSe${}_2$
• Spontaneous exciton condensation in 1T-TiSe2: a BCS-like approach
• Electron-Phonon Coupling and the Soft Phonon Mode in TiSe${}_2$
• Exciton condensation driving the periodic lattice distortion of 1T-TiSe2
• Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
• Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
• Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2
• Temperature dependent photoemission on 1T-TiSe2: Interpretation within the exciton condensate phase model
• Quantum Melting of the Charge Density Wave State in 1T-TiSe2
• Evolution of the Electronic Structure of 1T-CuxTiSe2
• Charge-Density-Wave induced modifications to the quasiparticle self-energy in 2H TaSe2
• Collective Modes and the Superconducting State Spectral Function of Bi2212
• Quantum and classical mode softening near the charge-density-wave/superconductor transition of Cu${}_x$TiSe${}_2$: Raman spectroscopic studies
• Quasiparticle-like peaks, kinks, and electron-phonon coupling at the ($\pi$,0) regions in the CMR oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$
• Short-range phase coherence and origin of the 1T-TiSe2 charge density wave
• Chiral charge order in 1$T$-TiSe${}_2$: importance of lattice degrees of freedom
• Superconductivity and hybrid soft modes in TiSe${}_2$
• Orbital selectivity causing anisotropy and particle-hole asymmetry in the charge density wave gap of $2H$-TaS${}_2$
• Spectroscopic signature of the $\mathbf{k}$-dependent electron-phonon coupling in $2H$-TaS${}_2$
• Strong interaction between electrons and collective excitations in multiband superconductor MgB2
• Local resilience of the $1T$-TiSe${}_2$ charge density wave to Ti self-doping
• Raman spectroscopy of optical phonon and incommensurate charge density wave modes in 2H-TaSe2 exfoliated flakes
• Temperature dependence of the excitonic insulator phase model in 1T-TiSe2
• Thermodynamic and transport properties of underdoped cuprates from ARPES data

Cited by in corpus (1)

• Metal-to-insulator transition in Pt-doped TiSe${}_2$ driven by emergent network of narrow transport channels