Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS<sub>2</sub>

Wijayaratne, Kapila; Zhao, Junjing; Malliakas, Christos D.; Chung, Duck Young; Kanatzidis, Mercouri G.; Chatterjee, U. K.

doi:10.1039/c7tc02641b

Cited by 24 publications

(24 citation statements)

References 71 publications

(100 reference statements)

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“…Upon compression, the instability is suppressed somewhere between 5 and 10 GPa, indicating the suppression of the CDW order. Interestingly, the instability disappears after the ETT, which indicates that the Fermi surface nesting itself is not the only driving force of CDW order, which is in line with other, more recent studies on 2H-TaS 2 [27]. The results of our calculations for ambient pressure are in agreement with Ref.…”

supporting

confidence: 92%

“…For TMDs, the following origins were extensively discussed: Fermi surface nesting [19], saddle points near Fermi surface [20], exciton-phonon [21], or electron-phonon coupling [22][23][24][25][26]. The most recent experimental evidence suggests that the latter plays a decisive role for CDW stabilization in Ta systems [27,28]. It is thus of profound importance to understand the interplay between electronic and crystal structure in 2H-TaS 2 .…”

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confidence: 99%

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Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory

et al. 2020

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The coexistence of charge density wave (CDW) and superconductivity in tantalum disulfide (2H-TaS 2) at low temperature is boosted by applying hydrostatic pressures to study both vibrational and magnetic transport properties. Around P c , we observe a superconducting dome with a maximum superconducting transition temperature T c ¼ 9.1 K. First-principles calculations of the electronic structure predict that, under ambient conditions, the undistorted structure is characterized by a phonon instability at finite momentum close to the experimental CDW wave vector. Upon compression, this instability is found to disappear, indicating the suppression of CDW order. The calculations reveal an electronic topological transition (ETT), which occurs before the suppression of the phonon instability, suggesting that the ETT alone is not directly causing the structural change in the system. The temperature dependence of the first vortex penetration field has been experimentally obtained by two independent methods. While a d wave and single-gap BCS prediction cannot describe the lower critical field H c1 data, the temperature dependence of the H c1 can be well described by a single-gap anisotropic s-wave order parameter.

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confidence: 92%

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confidence: 99%

Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory

et al. 2020

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“…b) displays the FS of TaS 2 /Gr/Ir(111) measured by ARPES. The hexagonal hole pocket around the center of the Brillouin zone and the spin-split hole pockets around the K-points compare qualitatively well with bulk ARPES results 37,38. We performed a tight-binding (TB) fit of the experimental band structure taking into ac-count all measured experimental ARPES and STS data and treating all TB parameters as mere fit parameters.…”

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confidence: 53%

Environmental Control of Charge Density Wave Order in Monolayer 2H-TaS₂

et al. 2019

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For quasi-freestanding 2H-TaS 2 in monolayer thickness grown by in situ molecular beam epitaxy on graphene on Ir(111), we find unambiguous evidence for a charge density wave close to a 3 × 3 periodicity. Using scanning tunneling spectroscopy, we determine the magnitude of the partial charge density wave gap. Angle-resolved photoemission spectroscopy, complemented by scanning tunneling spectroscopy for the unoccupied states, makes a tight-binding fit for the band structure of the TaS 2 monolayer possible. As hybridization with substrate bands is absent, the fit yields a precise value for the doping of the TaS 2 layer. Additional Li doping shifts the charge density wave to a 2 × 2 periodicity. Unexpectedly, the bilayer of TaS 2 also displays a disordered 2 × 2 charge density wave. Calculations of the phonon dispersions based on a combination of density-functional theory, density-functional perturbation theory, and many-body perturbation theory enable us to provide phase diagrams for the TaS 2 charge density wave as functions of doping, hybridization and interlayer potentials, and offer insight into how they affect lattice dynamics and stability. Our theoretical considerations are consistent with the experimental work presented and shed light on previous experimental and theoretical investigations of related systems.

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“…4(b) further reveals that the band dispersion consists of multiple changes in slope, commonly referred as the kinks. Similar kink features in the electronic dispersion have also been observed in a wide array of solid state systems, including various 2H-polytypes of TMDs [47][48][49][50][51][52], metallic systems [57,58], conventional superconductors [59], manganites [60], cuprate high temperature superconductors [53][54][55], and pnictide high temperature superconductors [61].…”

Section: B Model Calculation Of Pdh Structure Based On a Coupling Bementioning

confidence: 54%

Spectroscopic fingerprints of many-body renormalization in 1T−TiSe2

Zhao

Lee

et al. 2019

Phys. Rev. B

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We have employed high resolution angle resolved photoemission spectroscopy (ARPES) measurements to investigate many-body renormalizations of the single-particle excitations in 1T -TiSe2 . 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 ∼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 (A1g) and shear (Eg) 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 -TiSe2 .

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Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS₂

Cited by 24 publications

References 71 publications

Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory

Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory

Environmental Control of Charge Density Wave Order in Monolayer 2H-TaS₂

Spectroscopic fingerprints of many-body renormalization in 1T−TiSe2

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Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS2

Cited by 24 publications

References 71 publications

Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory

Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory

Environmental Control of Charge Density Wave Order in Monolayer 2H-TaS2

Spectroscopic fingerprints of many-body renormalization in 1T−TiSe2

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Product

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Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS₂

Environmental Control of Charge Density Wave Order in Monolayer 2H-TaS₂