A Raman probe of phonons and electron–phonon interactions in the Weyl semimetal NbIrTe4

Shojaei, Iraj Abbasian; Pournia, Seyyedesadaf; Le, Congcong; Ortiz, Brenden R.; Jnawali, Giriraj; Zhang, Fuchun; Wilson, Stephen D.; Jackson, Howard E.; Smith, L. M.

doi:10.1038/s41598-021-87302-y

Cited by 15 publications

(4 citation statements)

References 55 publications

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“…(Figure A,B). Indeed, there are also some instances when the generation mechanism is neither purely impulsive nor displacive as already reported for the case of bismuth and antimony. − Here for Cs 2 SnI 6 , we also made a similar observation and found evidence for the existence of both mechanisms of coherent phonon generation; (1) the FFT power spectrum reveals all possible modes of symmetry consistent with the reported Raman scattering data, yet the oscillatory behavior reflected in the time domain kinetic traces only portrays the vibrations with a characteristic period relatable to the A 1g mode. Such observation of merely the fully symmetric A 1g Raman-active mode in the time domain out of all the other different lower symmetry modes spectacular in the frequency domain (with equally comparable intensities) is the characteristic of the DECP mechanism .…”

Section: Resultssupporting

confidence: 86%

Mapping the Real-Time Vibrational Infrastructure of Cs₂SnI₆ Nanocrystals through Coherent Phonon Dynamics

Kaur¹,

Shukla²,

Babu³

et al. 2022

ACS Photonics

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Isolated polyhedra constituting the framework of Cs2SnI6 renders surplus degrees of dynamic freedom making it an abode of inherent anharmonicity. The ensuing properties of the integrated devices are, thus, inevitably governed by the underlying lattice vibrational dynamics. Here, with the aid of femtosecond transient absorption (TA) spectroscopy, we have made an attempt to capture a real-time picture of the vibrational modes prevalent in the Cs2SnI6 system and allocate the origin of the, thus far, unidentified modes. Further, we have also inspected the generation mechanism of the fully symmetric coherent phonon mode “A1g” which is manifested as strong oscillations in the time domain data for Cs2SnI6 and also the other low symmetry modes observable in the frequency domain in the unified framework of displacive excitation and impulsive scattering. As another major accomplishment, we pinpointed the position of the theoretically predicted yet never experimentally observed silent modes which usually are left undetected in the conventional frequency domain spectroscopic techniques. Strong support has been lent from the phase analysis of the excitation pump and intensity-dependent TA measurements. Subsequent to accounting for all the modes, the anharmonicity of the phonon modes, a straightforward consequence of phonon–phonon coupling, has been addressed. Furthermore, we executed temperature-dependent investigations which together with the pump-dependent studies provide insights into the extent of carrier-phonon coupling. All this critical information regarding the phonon modes can lend assistance in improving the performance of the devices based on Cs2SnI6.

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Section: Resultssupporting

confidence: 86%

Mapping the Real-Time Vibrational Infrastructure of Cs₂SnI₆ Nanocrystals through Coherent Phonon Dynamics

Kaur¹,

Shukla²,

Babu³

et al. 2022

ACS Photonics

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“…On the contrary, with ARPES a dependence of λ on the initial-state electron energy has been reported ( Kumar et al, 2022 ) and it remains difficult to distinguish between surface and bulk states which is why often time-resolved methods are used ( Sobota et al, 2023 ). Similarly, Raman measurements provide access to the e-ph interaction of optical modes, but again, the method is rather bulk sensitive ( Shojaei et al, 2021 ).…”

Section: Resultsmentioning

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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“…Since the latter vanishes for chemical potential µ → 0, we expect large couplings for |µ| vb. Recent experimental results suggest that the electronphonon coupling is of the order of 10 meV but varies substantially in a small energy range [51]. In any case, the value of g 0 affects the phonon-induced resistivity only via the overall resistivity scale ρ 0 discussed below.…”

Section: A Electron-phonon Couplingmentioning

confidence: 93%

Phonon-induced magnetoresistivity of Weyl semimetal nanowires

et al. 2021

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We study longitudinal magnetotransport in disorder-free cylindrical Weyl semimetal nanowires. Our theory includes a magnetic flux Φ piercing the nanowire and captures the finite curvature of the Fermi arc in the surface Brillouin zone through a boundary angle α. Electron backscattering by acoustic phonons via the deformation potential causes a finite resistivity which we evaluate by means of the semiclassical Boltzmann approach. We find that low-energy transport is dominated by surface states, where transport observables are highly sensitive to the angle α and to Aharonov-Bohm phases due to Φ. A generic subband dispersion relation allows for either one or two pairs of Fermi points. In the latter case, intra-node backscattering is possible and implies a parametrically larger resistivity than for a single Fermi point pair. As a consequence, large and abrupt resistivity changes take place across the transition points separating parameter regions with a different number of Fermi point pairs in a given subband.

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A Raman probe of phonons and electron–phonon interactions in the Weyl semimetal NbIrTe4

Cited by 15 publications

References 55 publications

Mapping the Real-Time Vibrational Infrastructure of Cs₂SnI₆ Nanocrystals through Coherent Phonon Dynamics

Mapping the Real-Time Vibrational Infrastructure of Cs₂SnI₆ Nanocrystals through Coherent Phonon Dynamics

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

Phonon-induced magnetoresistivity of Weyl semimetal nanowires

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A Raman probe of phonons and electron–phonon interactions in the Weyl semimetal NbIrTe4

Cited by 15 publications

References 55 publications

Mapping the Real-Time Vibrational Infrastructure of Cs2SnI6 Nanocrystals through Coherent Phonon Dynamics

Mapping the Real-Time Vibrational Infrastructure of Cs2SnI6 Nanocrystals through Coherent Phonon Dynamics

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

Phonon-induced magnetoresistivity of Weyl semimetal nanowires

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Mapping the Real-Time Vibrational Infrastructure of Cs₂SnI₆ Nanocrystals through Coherent Phonon Dynamics

Mapping the Real-Time Vibrational Infrastructure of Cs₂SnI₆ Nanocrystals through Coherent Phonon Dynamics