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   Dielectric screening of the Kohn anomaly of graphene on hexagonal boron nitride; Molina-Sanchez, Alejandro  ; et alin Physical Review. B, Condensed Matter and Materials Physics (2013), 88 Detailed reference viewed: 185 (7 UL)Anisotropic excitonic effects in the energy loss function of hexagonal boron nitride; Wirtz, Ludger ; et alin Physical Review. B, Condensed Matter and Materials Physics (2011), 83(8), 081413 The anisotropy of the valence energy-loss function of hexagonal boron nitride (hBN) is shown to be largely enhanced by the highly inhomogeneous character of the excitonic states. The energy loss with ... [more ▼] The anisotropy of the valence energy-loss function of hexagonal boron nitride (hBN) is shown to be largely enhanced by the highly inhomogeneous character of the excitonic states. The energy loss with momentum transfer parallel to the BN layers is dominated by strongly bound, quasi-two-dimensional excitons. In contrast, excitations with momentum transfer perpendicular to the layers are influenced by weakly bound three-dimensional excitons. This striking phenomenon is revealed by a combined study using high-precision nonresonant inelastic x-ray scattering measurements supported by ab initio calculations. The results are relevant in general to layered insulating systems. [less ▲] Detailed reference viewed: 142 (7 UL)Vibrational properties of hexagonal boron nitride: Inelastic X-ray scattering and ab initio calculations; ; et al in Physical Review Letters (2007), 98(9), 095503 The phonon dispersion relations of bulk hexagonal boron nitride have been determined from inelastic x-ray scattering measurements and analyzed by ab initio calculations. Experimental data and calculations ... [more ▼] The phonon dispersion relations of bulk hexagonal boron nitride have been determined from inelastic x-ray scattering measurements and analyzed by ab initio calculations. Experimental data and calculations show an outstanding agreement and reconcile the controversies raised by recent experimental data obtained by electron-energy loss spectroscopy and second-order Raman scattering. [less ▲] Detailed reference viewed: 130 (2 UL) |
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