Topic
Brillouin zone
About: Brillouin zone is a research topic. Over the lifetime, 13849 publications have been published within this topic receiving 383077 citations.
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TL;DR: This article improved the linear tetrahedron method to overcome systematic errors due to overestimations (underestimations) in integrals for convex (concave) functions, respectively.
Abstract: We improve the linear tetrahedron method to overcome systematic errors due to overestimations (underestimations) in integrals for convex (concave) functions, respectively. Our method is applicable to various types of calculations such as the total energy, the charge (spin) density, response functions, and the phonon frequency, in contrast with the Bl\"ochl correction, which is applicable to only the first two. We demonstrate the ability of our method by calculating phonons in MgB${}_{2}$ and fcc lithium.
93 citations
TL;DR: In this paper, the dressing field can serve as an effective tool to control spin and valley properties of gapped Dirac materials and can be potentially exploited in optoelectronic applications.
Abstract: We demonstrate theoretically that the interaction of electrons in gapped Dirac materials (gapped graphene and transition-metal dichalchogenide monolayers) with a strong off-resonant electromagnetic field (dressing field) substantially renormalizes the band gaps and the spin-orbit splitting. Moreover, the renormalized electronic parameters drastically depend on the field polarization. Namely, a linearly polarized dressing field always decreases the band gap (and, particularly, can turn the gap into zero), whereas a circularly polarized field breaks the equivalence of valleys in different points of the Brillouin zone and can both increase and decrease corresponding band gaps. As a consequence, the dressing field can serve as an effective tool to control spin and valley properties of the materials and be potentially exploited in optoelectronic applications.
93 citations
TL;DR: In this article, a scanning interference pattern produced by intersecting two cw lasers generates the density variation (acoustic phonons) through the thermal expansion for a light absorbing liquid.
Abstract: We have developed a new method of phonon spectroscopy using forced Brillouin scattering: A scanning interference pattern produced by intersecting two cw lasers generates the density variation (acoustic phonons) through the thermal expansion for a light-absorbing liquid. When the dispersion relation of phonons is satisfied, phonons are generated resonantly in the liquid. Continuous tuning of the frequency difference between the two lasers enables us to measure a resonance spectrum of light-excited phonons using light scattering phenomena. We demonstrate that this resonance spectrum is equivalent to the Brillouin spectrum of thermal phonons both experimentally and theoretically.
93 citations
TL;DR: The electronic structure of yttrium has been calculated at the equivalent of 6000 general points in the primitive Brillouin zone using the augmented-plane-wave method as discussed by the authors, and the density of states and the Fermi surface are presented.
Abstract: The electronic structure of yttrium has been calculated at the equivalent of 6000 general points in the primitive Brillouin zone using the augmented-plane-wave method. The density of states and the Fermi surface are presented. The topology of the Fermi surface is discussed, and experimental results for de Haasvan Alphen measurements are predicted. Wave functions have also been calculated for each of the occupied eigenvalues, and these were used to study the angular distribution of radiation resulting from positron annihilation in the metal. Few experimental results are currently available for comparison with this work.
93 citations
TL;DR: In this article, a simple model of thermal conductivity, based on the harmonic theory of solids, is used to study the heat transfer in nanostructures, which is obtained by summing the contribution of all the vibration modes of the system.
Abstract: A simple model of thermal conductivity, based on the harmonic theory of solids, is used to study the heat transfer in nanostructures. The thermal conductivity is obtained by summing the contribution of all the vibration modes of the system. All the vibrational properties (dispersion curves and relaxation time) that are used in the model are obtained using the data for bulk samples. The size effect is taken into account through the sampling of the Brillouin zone and the distance that a wave vector can travel between two boundaries in the structure. The model is used to predict the thermal conductivity of silicon nanowires and nanofilms, and demonstrates a good agreement with experimental results. Finally, using this model, the quality of the silicon interatomic potential, used for molecular-dynamics simulations of heat transfer, is evaluated.
93 citations