Results 271 to 280 of about 109,910 (319)
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Localized magnetism in a superlattice
Physical Review B, 1992We study a magnetic superlattice in which one of the inner atomic layers has been modified. We use the Ising model in the mean-field approximation. We find that if the modified exchange constant ${\mathit{J}}_{0}$ is greater than that in the bulk, localized magnetism occurs, with the magnetization decaying in both directions for the infinite ...
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Gaussian superlattice for phonons
Microelectronics Journal, 2005Abstract A recently developed long-wavelength continuum phenomenological model is employed to study the phonon tunneling through semiconductor heterostructures where the barrier parameters are varied gradually according to a Gaussian function. The optical modes of a Si/Si x Ge 1− x Gaussian superlattice are considered.
Diosdado Villegas +2 more
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Gold nanoparticle superlattices
Chemical Society Reviews, 2008Ordered metal nanoparticle assemblies--superlattices--have captivated and stirred the imagination of scientists and engineers alike and promise great prospect for future technologies. This potential though will greatly be determined by the understanding and control that can be exerted on the assembling processes.
B L V, Prasad +2 more
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Stark quantization in superlattices
Physical Review B, 1991The similarity and differences between real solids and superlattices for the localization induced by an electric field is discussed. In response to recent experimental results regarding the onset of negative differenial conductivity, the regimes of applicability of the Esaki-Tsu and Tsu-D\"ohler conditions are given.
, Tsu, , Esaki
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Superlattice magnetoroton bands
Physical Review Letters, 1987We present a theory for the effect of interlayer coupling in a superlattice on the magnetoroton modes of a two-dimensional electron gas in a strong magnetic field. We find that for typical fields and layer spacings the modes broaden into bands. For sufficiently small layer spacings, the gap necessary for the occurrence of the fractional quantum Hall ...
, Oji, , MacDonald, , Girvin
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Magic-angle lasers in nanostructured moiré superlattice
Nature Nanotechnology, 2021Xin-Rui Mao +4 more
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Hydrodynamic moiré superlattice
ScienceThe structural periodicity in photonic crystals guarantees the crystal’s effective energy band structure, which is the fundamental cornerstone of topological and moiré physics. However, the shear modulus in most fluids is close to zero, which makes it challenging for fluids to maintain spatial periodicity akin to photonic crystals. We realized periodic
Guoqiang Xu +7 more
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Surface phonons in superlattices
Journal of Electron Spectroscopy and Related Phenomena, 1983Abstract We report the existence of surface localized phonons for a superlattice consisting of alternating slabs (parallel to the surface) of two different crystals. The superlattice has a larger periodicity in the direction perpendicular to the slabs and therefore many phonon branches in the folded Brillouin zone.
Djafari-Rouhani, B. +2 more
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Physical Review B, 1986
We present a first-principles theory of the band structure of lattice-matched superlattices. We formulate the one-electron problem of superlattices in the Bloch representation of one of the constituent materials. In this formulation, the symmetry breaking along the superlattice axis leads to partitioning and folding of the original homogeneous crystal ...
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We present a first-principles theory of the band structure of lattice-matched superlattices. We formulate the one-electron problem of superlattices in the Bloch representation of one of the constituent materials. In this formulation, the symmetry breaking along the superlattice axis leads to partitioning and folding of the original homogeneous crystal ...
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Tailoring infrared optical properties with superlattices of superlattices
Physical Review B, 1992, Einevoll, , Sham
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