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: Using spin- and angle-resolved photoemission spectroscopy, one of the most studied cuprate superconductors, Bi2212, has a nontrivial spin texture with a spin-momentum locking that circles the Brillouin zone center and aspin-layer locking that allows states of opposite spin to be localized in different parts of the unit cell.
Abstract: Cuprate superconductors have long been thought of as having strong electronic correlations but negligible spin-orbit coupling. Using spin- and angle-resolved photoemission spectroscopy, we discovered that one of the most studied cuprate superconductors, Bi2212, has a nontrivial spin texture with a spin-momentum locking that circles the Brillouin zone center and a spin-layer locking that allows states of opposite spin to be localized in different parts of the unit cell. Our findings pose challenges for the vast majority of models of cuprates, such as the Hubbard model and its variants, where spin-orbit interaction has been mostly neglected, and open the intriguing question of how the high-temperature superconducting state emerges in the presence of this nontrivial spin texture.
94 citations
TL;DR: In this article, the vibrational modes in KNbO3 were analyzed using first principles total-energy calculations based on local density functional theory, and the normal mode frequencies and eigenvectors were determined for the cubic perovskite structure with wave vectors at the center (Γ) and corner (R) of the Brillouin zone using the frozen-phonon technique.
Abstract: The vibrational modes in KNbO3 are analyzed using first principles total-energy calculations based on local density functional theory. Normal mode frequencies and eigenvectors are determined for the cubic perovskite structure with wave vectors at the center (Γ) and corner (R) of the Brillouin zone using the frozen-phonon technique. The frequencies are in good agreement with available experimental results with the possible exception of the lowest-frequency zone-center (ferroelectric) mode. Our calculations give a ferroelectric mode which becomes unstable with increasing volume. However, at the equilibrium volume it is stable with a frequency of ∼100 cm−1.
94 citations
TL;DR: In this paper, the authors show that superluminous Stokes pulses of quasisoliton type and partial self-induced transparency for the pump can be obtained even with a cw-coupled pump wave.
Abstract: Nonstationary stimulated Brillouin backscattering in a large gain optical-fiber ring cavity laser exhibits superluminous Stokes pulses of quasisoliton type and partial self-induced transparency for the pump. Experimental evidences, comforted by numerical simulation of the three-wave coherent model taking the acoustic-wave dynamics into account, show that this class of long transients occurs even with a cw-coupled pump wave.
94 citations
TL;DR: The study of photonic band gap formation in two-dimensional high-refractive-index disordered materials where the dielectric structure is derived from packing disks in real and reciprocal space suggests the optimization of short-range order are of key importance for designing disordered PBG materials.
Abstract: We study photonic band gap formation in two-dimensional high-refractive-index disordered materials where the dielectric structure is derived from packing disks in real and reciprocal space. Numerical calculations of the photonic density of states demonstrate the presence of a band gap for all polarizations in both cases. We find that the band gap width is controlled by the increase in positional correlation inducing short-range order and hyperuniformity concurrently. Our findings suggest that the optimization of short-range order, in particular the tailoring of Bragg scattering at the isotropic Brillouin zone, are of key importance for designing disordered PBG materials.
94 citations
TL;DR: In this article, band structures and Fermi surfaces for three quasi-octahedral layer compounds are presented, and the dependence of both properties on the component kz of the wavevector normal to the layers is shown to be important particularly in its effect on the formation of charge density waves.
Abstract: Band structures and Fermi surfaces are presented for three quasi-octahedral layer compounds. The dependence of both properties on the component kz of the wavevector normal to the layers is shown to be important particularly in its effect on the formation of charge density waves. Whereas the nesting of the Fermi surfaces is rather weak in the two-dimensional approximation it becomes very strong if the critical wavevector q is a allowed to have a qz component and equal to one third of the height of the Brillouin zone. Two additional (related) features are discussed namely the three-fold (as opposed to six-fold) symmetry and the small trigonal splitting of the t2g triplet at the centre of the zone.
94 citations