Coexisting one-dimensional and three-dimensional spectral signatures in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TaTe</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Zwick, F.; Berger, H.; Grioni, M.; Margaritondo, G.; Forró, Lászlø; LaVeigne, J.; Tanner, D. B.; Onellion, M.

doi:10.1103/physrevb.59.7762

Cited by 16 publications

(5 citation statements)

References 28 publications

(31 reference statements)

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“…According to our STS results, CDW does not fully gap the Fermi surface of TaTe4, which indicates that under the CDW phase, 1D and 3D features exist simultaneously and only part of the electrons are involved in the CDW phase, as is also concluded by previous angleresolved photoemission spectroscopy (ARPES) measurement [52]. The remaining DOS at Fermi level contributes to the sample conductance at low temperatures.…”

Section: Discussionsupporting

confidence: 73%

Eightfold fermionic excitation in a charge density wave compound

Zhang

Sun

et al. 2020

Phys. Rev. B

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Unconventional quasiparticle excitations in condensed matter systems have become one of the most important research frontiers. Beyond twofold and fourfold degenerate Weyl and Dirac fermions, threefold, sixfold, and eightfold symmetry protected degeneracies have been predicted. However they remain challenging to realize in solid state materials. Here the charge density wave compound TaTe 4 is proposed to hold eightfold fermionic excitation and Dirac point in energy bands. High quality TaTe 4 single crystals are prepared, where the charge density wave is revealed by directly imaging the atomic structure and a pseudogap of about 45 meV on the surface. Shubnikov-de Haas oscillations of TaTe 4 are consistent with band structure calculation. Scanning tunneling microscopy/spectroscopy reveals atomic step edge states on the surface of TaTe 4 . This work uncovers that the charge density wave is able to induce new topological phases and sheds new light on the novel excitations in condensed matter materials.

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Section: Discussionsupporting

confidence: 73%

Eightfold fermionic excitation in a charge density wave compound

Zhang

Sun

et al. 2020

Phys. Rev. B

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“…A more recent DFT study provided data concerning the electronic structure of TaTe 4 but the origin of the bulk CDW was not considered [19]. Angular resolved photoemission spectra of TaTe 4 exhibits a combination of 1D and 3D Fermi surface components [21]: The experiment does not clarify, though, if there are two decoupled Fermi surface components nor if the Fermi surface nesting plays a role in the structural modulation, although a recent theoretical study suggests that electron-phonon is the main source of the modulation [22]. As noted above, the electronic structure of the room temperature modulated structure has not been considered in any of these works.…”

Section: Introductionmentioning

confidence: 99%

Competition between Ta-Ta and Te-Te bonding leading to the commensurate charge density wave in TaTe4

et al. 2022

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The origin of the charge density wave in TaTe 4 is discussed on the basis of a first-principles density functional theory analysis of the Fermi surface, electron-hole response function, phonon band structure of the average structure, and structural optimization of the modulated phase. Analysis of the band structure and Fermi surface of the average structure clearly proves that despite the presence of TaTe 4 chains in the crystal structure, TaTe 4 is in fact a 3D material as far as the electronic structure near the Fermi level is concerned. A Fermi surface nesting mechanism is dismissed as the origin of the 2a × 2a × 3c structural modulation. The optimized 2a × 2a × 3c structure, which is found to be the more stable modulation in agreement with the experimental observations, can be obtained directly from a soft-phonon mode computed for the undistorted structure. Our results suggest that the driving force for the distortion is the maximization of Ta-Ta metal-metal bonding subject to inducing the minimum bonding decrease in the Te sublattice.

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“…Ternary compounds belonging to the family Cu 3 MSe 4 (M = V, Nb, Ta) are interesting materials due principally to their potential applications as electronic devices, especially as lightmodulators [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%