# Mapping the unoccupied state dispersions in Ta2NiSe5 with resonant inelastic x-ray scattering

@article{Monney2020MappingTU,
title={Mapping the unoccupied state dispersions in
Ta2NiSe5
with resonant inelastic x-ray scattering},
author={Claude Monney and Marc Herzog and Aki Pulkkinen and Y B Huang and Jonathan Pelliciari and Paul Olalde-Velasco and Naoyuki Katayama and Minoru Nohara and H. Takagi and Thorsten Schmitt and Takashi Mizokawa},
journal={Physical Review B},
year={2020},
volume={102},
pages={085148}
}
• Published 6 August 2020
• Physics
• Physical Review B
The transition metal chalcogenide ${\mathrm{Ta}}_{2}{\mathrm{NiSe}}_{5}$ undergoes a second-order phase transition at ${T}_{c}=328\phantom{\rule{0.16em}{0ex}}\text{K}$ involving a small lattice distortion. Below ${T}_{c}$, a band gap at the center of its Brillouin zone increases up to about 0.35 eV. In this work, we study the electronic structure of ${\mathrm{Ta}}_{2}{\mathrm{NiSe}}_{5}$ in its low-temperature semiconducting phase, using resonant inelastic x-ray scattering (RIXS) at the Ni ${L… 6 Citations ## Figures from this paper • Materials Science Physical Review Research • 2021 Recently, rutile${\mathrm{RuO}}_{2}$has raised interest for its itinerant antiferromagnetism, crystal Hall effect, and strain-induced superconductivity. Understanding and manipulating these • Physics Physical Review B • 2022 Angle-resolved photoelectron spectroscopy is an extremely powerful probe of materials to access the occupied electronic structure with energy and momentum resolution. However, it remains blind to • Physics • 2022 We develop a self-consistent Maxwell-Bloch formalism for the interaction of X-rays with two-dimensional crystalline materials by incorporating the Bloch theorem and Coulomb many-body interaction. • Physics • 2022 Coexistence of localized and extended excitations is central to the macroscopic properties of correlated materials. For 5d transition metal compounds, electron correlations alone generally do not • Physics AIP Advances • 2022 We employ polarization-resolved femtosecond optical pump–probe spectroscopy to investigate the nonequilibrium photocarrier dynamics in excitonic insulator Ta2NiSe5. The electronic dynamics, including ## References SHOWING 1-10 OF 56 REFERENCES • Materials Science • 2017 We present an experimental study of the local and collective magnetism of${\mathrm{EuFe}}_{2}{\mathrm{As}}_{2}$that is isostructural with the high-temperature superconductor parent compound • Physics Communications Physics • 2019 Unconventional superconductivity arises at the border between the strong coupling regime with local magnetic moments and the weak coupling regime with itinerant electrons, and stems from the physics • Physics Scientific Reports • 2018 Anisotropic optical properties of a single crystal Ta2NiSe5 along the a- and c-axes are obtained and the temperature-dependent superfluid plasma frequency of the excitonic condensation in Ta2 NiSe5 has been determined from measured optical data. • Physics • 2015 Electronic spin and orbital (dd) excitation spectra of (Ca{x}La{1-x})(Ba{1.75-x}La{0.25+x})Cu{3}O{y} samples are measured by resonant inelastic x-ray scattering (RIXS). In this compound, Tc of • Physics Physical review letters • 2017 The ability to manipulate the band gap of Ta_{2}NiSe_{5} with light on the femtosecond time scale is demonstrated, and it is shown that below the critical excitation density of F_{C}=0.2 mJ cm^{-2, the band gap narrows transiently, while it is enhanced above F{C}. I study dynamical instabilities in Ta$_2$NiSe$_5$using density functional theory based calculations. The calculated phonon dispersions show two unstable optical branches. All the acoustic branches • Materials Science • 1999 The formal relationship between ultrasoft (US) Vanderbilt-type pseudopotentials and Bl\"ochl's projector augmented wave (PAW) method is derived. It is shown that the total energy functional for US • Physics • 2018 Femtosecond time-resolved mid-infrared reflectivity is used to investigate the electron and phonon dynamics occurring at the direct band gap of the excitonic insulator Ta$_2$NiSe$_5\$ below the
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Physical review letters
• 2020
A purely electronic order parameter of excitonic nature is identified that breaks these discrete crystal symmetries and contributes to the experimentally observed lattice distortion from an orthorombic to a monoclinic phase.
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Physical Review B
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Excitonic insulator (EI) was proposed in 60's as a distinct insulating state originating from pure electronic interaction, but its material realization has been elusive with extremely few material