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6 papers · 2 filters
Morphological Symmetry Breaking During Epitaxial Growth at Grazing Incidence
Jianxin Zhong, Enge Wang, Qian Niu +1
It is shown that, in submonolayer growth at off-normal incidence, even much less than one percent of transfer from the condensation energy of the deposited atoms into adatom motion…
Jellium surface energy beyond the local-density approximation: Self-consistent-field calculations
J. M. Pitarke, A. G. Eguiluz
We report extensive self-consistent calculations of jellium surface energies, by going beyond the local-density approximation. The density-response function of a bounded free-elect…
The broad Brillouin doublets and central peak of KTaO_3
E. Farhi, A. K. Tagantsev, B. Hehlen +3
The incipient ferroelectric KTaO3 presents low-T Brillouin spectra anomalies,e.g. a broad central peak (CP), and some additional Brillouin doublets (BD), whose origin is interprete…
The Broad Brillouin Doublet and CP of Ktao_3 : Second Sound vs. Two-Phonon Difference Scattering
E. Farhi, A. K. Tagantsev, B. Hehlen +3
Low-T Brillouin spectra of the incipient ferroelectric KTaO3 exhibit a broad central peak (CP), and additional Brillouin doublets (BD), that can both be related to phonon-density f…
Low energy phonon spectrum and its parameterization in pure KTaO3 under 80 K
E. Farhi, A. K. Tagantsev, R. Currat +3
High resolution data on low energy phonon branches (acoustic and soft optic) along the three principal symmetry axes in pure KTaO3 were obtained by cold neutron inelastic scatterin…
Umklapp Scattering and Heat Conductivity of Superlattices
M. V. Simkin, G. D. Mahan
The mean free path of phonons in superlattices is estimated. It is shown to be strongly dependent on the superlattice period due to the Umklapp scattering in subbands. It first fal…