Temperature dependence of thek=0 optical phonons of Bi and Sb

Höhne, J.; Wenning, U.; Schulz, Hartwig; Hüfner, S.

doi:10.1007/bf01320519

Cited by 23 publications

(23 citation statements)

References 20 publications

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“…In both substances, the modes exhibit an increase (decrease) in linewidth (frequency) with increasing temperature, T, which is similar to what is found in many materials, likely, a manifestation of anharmonic decay. Consistent with our low power densities, corresponding values from cw spontaneous RS and TD traces agree well with each other, and with early Raman work [15,16]. The spontaneous cross sections show a relatively weak T dependence, in agreement with a previous report [15].…”

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confidence: 92%

Optical Probing of Ultrafast Electronic Decay in Bi and Sb with Slow Phonons

et al. 2013

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supporting

confidence: 92%

Optical Probing of Ultrafast Electronic Decay in Bi and Sb with Slow Phonons

et al. 2013

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“…Previous Raman studies of antimony at ambient pressure have addressed the resonance effects, 12 the secondorder scattering by optical modes, 13 the effect of temperature on the first-order modes, 14 and the coupling of the first-order Raman modes to electronic excitations. 15 The coherent A 1g phonon generation in Sb by short laser pulses is the subject of several more recent reports.…”

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confidence: 99%

Effect of pressure on the Raman modes of antimony

et al. 2006

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The effect of pressure on the zone-center optical phonon modes of antimony in the A7 structure has been investigated by Raman spectroscopy. The Ag and Eg frequencies exhibit a pronounced softening with increasing pressure, the effect being related to a gradual suppression of the Peierls-like distortion of the A7 phase relative to a cubic primitive lattice. Also, both Raman modes broaden significantly under pressure. Spectra taken at low temperature indicate that the broadening is at least partly caused by phonon-phonon interactions. We also report results of ab initio frozenphonon calculations of the Ag and Eg mode frequencies. Presence of strong anharmonicity is clearly apparent in calculated total energy versus atom displacement relations. Pronounced nonlinearities in the force versus displacement relations are observed. Structural instabilities of the Sb-A7 phase are briefly addressed in the Appendix.

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“…48,49 Such dips also occur in other group V elements (As, Sb) as well as in IV-VI compounds like SnTe, and have been interpreted as caused by long-ranged interactions due to a resonant bonding effect in materials with pseudo-rocksalt structure. 50 Our calculation exaggerates this dip, a phenomenon well known from previous theoretical work.…”

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Ab initiolattice dynamics and electron-phonon coupling of Bi(111)

et al. 2014

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We present a comprehensive ab initio study of structural, electronic, lattice dynamical and electron-phonon coupling properties of the Bi(111) surface within density functional perturbation theory. Relativistic corrections due to spin-orbit coupling are consistently taken into account.Changes of interatomic couplings are confined mostly to the first two bilayers, resulting in superbulk modes with frequencies higher than the optic bulk spectrum, and in an enhanced density of states at lower frequencies for atoms in the first bilayer. We give results for the momentumdependent electron-phonon coupling of electronic states belonging to the two surface electronic bands along ΓM which cross the Fermi energy. For larger momenta the lower surface band exhibits a moderate electron-phonon coupling of about 0.45, which is larger than the coupling constant of bulk Bi. For momenta close to Γ, states of both surface bands show even stronger couplings because of interband transitions to bulk states near Γ around the Fermi level. For these cases, the state dependent Eliashberg functions exhibit pronounced peaks at low energy and strongly deviate in shape from a Debye-like spectrum, indicating that an extraction of the coupling strength from measured electronic self-energies based on this simple model is likely to fail.

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Temperature dependence of thek=0 optical phonons of Bi and Sb

Cited by 23 publications

References 20 publications

Optical Probing of Ultrafast Electronic Decay in Bi and Sb with Slow Phonons

Optical Probing of Ultrafast Electronic Decay in Bi and Sb with Slow Phonons

Effect of pressure on the Raman modes of antimony

Ab initiolattice dynamics and electron-phonon coupling of Bi(111)

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