Observation of Dirac Charge-Density Waves in Bi2Te2Se

Ruckhofer, Adrian; Benedek, G.; Bremholm, Martin; Ernst, Wolfgang; Tamtögl, Anton

doi:10.3390/nano13030476

Cited by 3 publications

(2 citation statements)

References 81 publications

(73 reference statements)

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“…HAS is ideally suited to study CDW phases since the neutral He beam is directly scattered by the surface electrons and HAS permits determination of the e-ph coupling λ ( Manson et al, 2022 ) which specifies also conventional superconductivity ( Benedek et al, 2020b ). Previous HAS diffraction and phase transition data from HAS are described in Benedek et al (2020b) , including CDW systems with HAS ( Tamtögl et al, 2019 ; Ruckhofer et al, 2023 ).…”

Section: Methodsmentioning

confidence: 99%

Surface properties of 1T-TaS2 and contrasting its electron-phonon coupling with TlBiTe2 from helium atom scattering

Maier,

Hourigan,

Ruckhofer

et al. 2023

Front. Chem.

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We present a detailed helium atom scattering study of the charge-density wave (CDW) system and transition metal dichalcogenide 1T-TaS2. In terms of energy dissipation, we determine the electron-phonon (e-ph) coupling, a quantity that is at the heart of conventional superconductivity and may even “drive” phase transitions such as CDWs. The e-ph coupling of TaS2 in the commensurate CDW phase (λ = 0.59 ± 0.12) is compared with measurements of the topo-logical insulator TlBiTe2 (λ = 0.09 ± 0.01). Furthermore, by means of elastic He diffraction and resonance/interference effects in He scattering, the thermal expansion of the surface lattice, the surface step height, and the three-dimensional atom-surface interaction potential are determined including the electronic corrugation of 1T-TaS2. The linear thermal expansion coefficient is similar to that of other transition-metal dichalcogenides. The He−TaS2 interaction is best described by a corrugated Morse potential with a relatively large well depth and supports a large number of bound states, comparable to the surface of Bi2Se3, and the surface electronic corrugation of 1T-TaS2 is similar to the ones found for semimetal surfaces.

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Section: Methodsmentioning

confidence: 99%

Surface properties of 1T-TaS2 and contrasting its electron-phonon coupling with TlBiTe2 from helium atom scattering

Maier,

Hourigan,

Ruckhofer

et al. 2023

Front. Chem.

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“…In a previous work [31], we showed that the temperature or incident wave vector dependence of the Debye-Waller (DW) exponent in helium atom scattering (HAS) provides direct information on the total mass enhancement factor λ, characterizing the el-ph interaction at a conducting surface. The value of λ derived in this way (hereafter denoted as λ HAS ) was reported for several metal surfaces [32], overlayers [33], graphene [34], topological semimetals [35][36][37][38], layered dichalcogenides [39,40], 2D superconductors [41] and low-and multi-dimensional surfaces [42].…”

Section: Introductionmentioning

confidence: 97%

The Electron–Phonon Interaction at Vicinal Metal Surfaces Measured with Helium Atom Scattering

Benedek,

Miret-Artés,

Manson

et al. 2023

Nanomaterials

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Recently, it was demonstrated that inelastic helium atom scattering from conducting surfaces provides a direct measurement of the surface electron–phonon coupling constant (mass enhancement factor λ) via the temperature or the incident wave vector dependence of the Debye–Waller exponent. Here, previous published as well as unpublished helium atom scattering diffraction data from the vicinal surfaces of copper (Cu(11α), with α = 3, 5, 7) and aluminum (Al(221) and Al(332)) were analyzed to determine λ. The results suggested an enhancement with respect to the corresponding data for the low-index surfaces (111) and (001) above the roughening transition temperature. The specific role of steps compared to that of terraces is briefly discussed.

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The Electron-Phonon Interaction at Vicinal Metal Surfaces Measured with Helium-Atom Scattering

Benedek,

Miret-Artés,

Manson

et al. 2023

Preprint

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It has been recently demonstrated that inelastic helium-atom scattering from conducting surfaces can provide a direct measurement of the surface electron-phonon coupling constant (mass-enhancement factor ) via the temperature- or the incident-energy-dependence of the Debye-Waller exponent. The analysis of previous published as well as unpublished helium atom scattering diffraction data from the vicinal surfaces of copper (Cu(11),  = 3,5,7) and aluminium (Al(221) and Al(332)) permits to extract  for this class of surfaces, suggesting an enhancement with respect to the corresponding data for the low-index surfaces (111) and (001) above a possible roughening transition temperature. The specific role of steps as compared to that of terraces is briefly discussed.

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Observation of Dirac Charge-Density Waves in Bi2Te2Se

Cited by 3 publications

References 81 publications

Surface properties of 1T-TaS2 and contrasting its electron-phonon coupling with TlBiTe2 from helium atom scattering

Surface properties of 1T-TaS2 and contrasting its electron-phonon coupling with TlBiTe2 from helium atom scattering

The Electron–Phonon Interaction at Vicinal Metal Surfaces Measured with Helium Atom Scattering

The Electron-Phonon Interaction at Vicinal Metal Surfaces Measured with Helium-Atom Scattering

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