Journal ArticleDOI
Dynamic Structure Factor: An Introduction
TLDR
In this paper, the doubly differential cross-section for weak inelastic scattering of waves or particles by manybody systems is derived in Born approximation and expressed in terms of the dynamic structure factor according to van Hove.Abstract:
The doubly differential cross-section for weak inelastic scattering of waves or particles by manybody systems is derived in Born approximation and expressed in terms of the dynamic structure factor according to van Hove. The application of this very general scheme to scattering of neutrons, x-rays and high-energy electrons is discussed briefly. The dynamic structure factor, which is the space and time Fourier transform of the density-density correlation function, is a property of the manybody system independent of the external probe and carries information on the excitation spectrum of the system. The relation of the electronic structure factor to the density-density response function defined in linear-response theory is shown using the fluctuation-dissipation theoremread more
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Journal ArticleDOI
Imaging Density Disturbances in Water with a 41.3-Attosecond Time Resolution
TL;DR: It is shown that the momentum flexibility of inelastic x-ray scattering may be exploited to invert its loss function, allowing real time imaging of density disturbances in a medium, and suggested that energy-loss scatteringmay be applied more generally to the study of attosecond phenomena.
Journal ArticleDOI
Direct observation of the lowest indirect exciton state in the bulk of hexagonal boron nitride
TL;DR: In this article, the authors combine electron energy-loss spectroscopy and first-principles calculations based on density functional theory (DFT) to identify the lowest indirect exciton state in the in-plane charge response of hexagonal boron nitride (h-BN) single crystals.
Book ChapterDOI
Plasmons and Related Excitations
TL;DR: The Inelastic Scattering Cross Section as mentioned in this paper shows that inner shell electrons show almost no overlap between neighbouring sites, so the exchange integral is negligibly small, leading to an extremely small bandwidth.
Journal ArticleDOI
Theory of momentum-resolved phonon spectroscopy in the electron microscope
Rebecca J. Nicholls,Fredrik S. Hage,Dougal G. McCulloch,Quentin M. Ramasse,Keith Refson,Jonathan R. Yates +5 more
TL;DR: In this article, a theoretical framework for the prediction and interpretation of momentum-dependent phonon spectra due to coherent inelastic scattering of electrons was proposed, and first-principles lattice dynamics using periodic density functional theory was used to compare to recent electron energy loss measurements on cubic and hexagonal boron nitride performed within a scanning transmission electron microscope.
Posted Content
Acoustic plasmons and conducting carriers in hole-doped cuprate superconductors
Amol Singh,H. Y. Huang,Christopher Lane,Jianwei Li,Jun Okamoto,S. Komiya,Robert S. Markiewicz,Arun Bansil,A. Fujimori,Chuangtian Chen,Dennis Huang +10 more
TL;DR: In this article, the authors investigated whether the doped holes in cuprates are conducting carriers or are too incoherent to induce collective charge excitation, and provided unprecedented spectroscopic evidence for acoustic plasmons and long sought conducting p holes in hole-doped cuprates.
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